Description:
Cryosurgical ablation (hereafter referred to as cryosurgery or cryoablation) involves freezing of target tissues; this is most often performed by inserting a coolant-carrying probe into the tumor. Cryosurgery may be performed as an open surgical technique or as a closed procedure under laparoscopic or ultrasound guidance. 

Background
Renal Tumors
Localized kidney cancer is treated with radical nephrectomy or nephron-sparing surgery. Prognosis drops precipitously if the tumor extends outside the kidney capsule because chemotherapy is relatively ineffective against metastatic renal cell carcinoma.

Lung Tumors and Lung Metastases
Early-stage lung tumors are typically treated surgically. Patients with early-stage lung cancer who are not surgical candidates may be candidates for radiotherapy with curative intent. Cryoablation is being investigated in patients who are medically inoperable, with small primary lung cancers or lung metastases from extrapulmonary primaries. Patients with a more advanced local disease or metastatic disease may undergo chemotherapy with radiation following resection. Treatment is rarely curative; rather, it seeks to retard tumor growth or palliate symptoms.

Breast Tumors
Early-stage primary breast cancers are treated surgically. The selection of lumpectomy, modified radical mastectomy, or another approach is balanced against the patient's desire for breast conservation, the need for tumor-free margins in resected tissue, and the patient's age, hormone receptor status, and other factors. Adjuvant radiotherapy decreases local recurrences, particularly for those who select lumpectomy. Adjuvant hormonal therapy and/or chemotherapy are added, depending on the presence and number of involved nodes, hormone receptor status, and other factors. Treatment of metastatic disease includes surgery to remove the lesion and combination chemotherapy.

Fibroadenomas are common benign tumors of the breast that can present as a palpable mass or a mammographic abnormality. These benign tumors are frequently surgically excised to rule out a malignancy.

Pancreatic Cancer
Pancreatic cancer is a relatively rare solid tumor that occurs almost exclusively in adults, and it is largely considered incurable. Surgical resection of tumors contained entirely within the pancreas is currently the only potentially curative treatment. However, the nature of the cancer is such that few tumors are found at such an early and potentially curable stage. Patients with a more advanced local disease or metastatic disease may undergo chemotherapy with radiation following resection. Treatment focuses on slowing tumor growth and palliation of symptoms.

Bone Cancer and Bone Metastases
Primary bone cancers are extremely rare, accounting for less than 0.2% of all cancers. Bone metastases are more common, with clinical complications including debilitating bone pain. Treatment for bone metastases is performed to relieve local bone pain, provide stabilization, and prevent impending fracture or spinal cord compression.

Regulatory Status
Several cryoablation devices have been cleared for marketing by the U.S. Food and Drug Administration (FDA) through the 510(k) process for use in open, minimally invasive, or endoscopic surgical procedures in the areas of general surgery, urology, gynecology, oncology, neurology, dermatology, proctology, thoracic surgery, and ear, nose, and throat. Examples include:

• Cryocare^® Surgical System (Endocare).
• CryoGen Cryosurgical System (Cryosurgical).
• CryoHit^® (Galil Medical) for the treatment of breast fibroadenoma.
• IceSense3™, ProSense™, and MultiSense Systems (IceCure Medical).
• SeedNet™ System (Galil Medical).
• Visica^® System (Sanarus Medical).

FDA product code: GEH.

Related Policies
70175 Cryosurgical Ablation of Primary or Metastatic Liver Tumors
70179 Cryoablation of Prostate Cancer
70191 Radiofrequency Ablation of Primary or Metastatic Liver Tumors
70195 Radiofrequency Ablation of Miscellaneous Solid Tumors Excluding Liver Tumors

Policy
Cryosurgical ablation may be considered MEDICALLY NECESSARY to treat localized renal cell carcinoma that is no more than 4 cm in size when either of the following criteria is met:

• Preservation of kidney function is necessary (i.e., the patient has 1 kidney or renal insufficiency defined by a glomerular filtration rate of < 60 mL/min/m²), and standard surgical approach (i.e., resection of renal tissue) is likely to worsen kidney function substantially.
• The patient is not considered a surgical candidate.

Cryosurgical ablation may be considered MEDICALLY NECESSARY to treat lung cancer when either of the following criteria is met:

• The patient has early-stage non-small-cell lung cancer and is a poor surgical candidate.
• The patient requires palliation for a central airway obstructing lesion.

Cryosurgical ablation is investigational and/or unproven and therefore considered NOT MEDICALLY NECESSARY as a treatment for benign or malignant tumors of the breast, lung (other than defined above), pancreas, or bone and other solid tumors or metastases outside the liver and prostate and to treat renal cell carcinomas in patients who are surgical candidates

Policy Guidelines
None

Rationale
This evidence review was created in October 2003 and has been updated regularly with searches of the PubMed database. The most recent literature update was performed through June 12, 2022.

Evidence reviews assess the clinical evidence to determine whether the use of technology improves the net health outcome. Broadly defined, health outcomes are the length of life, quality of life, and ability to function including benefits and harms. Every clinical condition has specific outcomes that are important to patients and managing the course of that condition. Validated outcome measures are necessary to ascertain whether a condition improves or worsens; and whether the magnitude of that change is clinically significant. The net health outcome is a balance of benefits and harms.

To assess whether the evidence is sufficient to draw conclusions about the net health outcome of technology, 2 domains are examined: the relevance, and the quality and credibility. To be relevant, studies must represent one or more intended clinical use of the technology in the intended population and compare an effective and appropriate alternative at a comparable intensity. For some conditions, the alternative will be supportive care or surveillance. The quality and credibility of the evidence depend on study design and conduct, minimizing bias and confounding that can generate incorrect findings. The randomized controlled trial (RCT) is preferred to assess efficacy; however, in some circumstances, nonrandomized studies may be adequate. Randomized controlled trials are rarely large enough or long enough to capture less common adverse events and long-term effects. Other types of studies can be used for these purposes and to assess generalizability to broader clinical populations and settings of clinical practice.

Cryoablation for Early Stage Kidney Cancer
Clinical Context and Therapy Purpose
The purpose of cryoablation in patients who have early stage kidney cancer is to provide a treatment option that is an alternative to or an improvement on existing therapies.

The question addressed in this evidence review is: Does cryoablation of early stage kidney tumors improve the net health outcome?

The following PICO was used to select literature to inform this review.

Populations
The relevant population of interest is individuals with early stage kidney tumors.

The review of evidence addresses the use of cryoablation in 2 populations of patients who have early stage renal cancer:

Patients who are candidates for surgery; Patients who are not surgical candidates.

Patients with 1 kidney or with renal insufficiency are likely to be deemed poor surgical candidates because a standard surgical approach (i.e., resection of renal tissue) is likely to worsen kidney function substantially.

Interventions
The therapy being considered is cryoablation, also referred to as cryosurgery.

Cryoablation involves freezing of target tissues; this is most often performed by inserting a coolant-carrying probe into the tumor. Cryosurgery may be performed as an open surgical technique or as a closed procedure under laparoscopic or ultrasound guidance.

Comparators
For patients with stage 1 kidney cancer who are surgical candidates, the comparator of interest is surgical resection. Surgery by partial nephrectomy, whenever feasible, or by radical nephrectomy is the standard of care for stage 1 kidney cancer.

For select patients, including those with small renal masses < 2 cm or significant competing risks of death or morbidity from intervention, active surveillance is an option. Active surveillance entails serial abdominal imaging and periodic metastatic survey including blood work and chest imaging.

Outcomes
The general outcomes of interest are overall survival (OS), disease-specific survival, quality of life, and treatment-related morbidity.

The hypothesized advantages of cryosurgery include improved local control and benefits common to any minimally invasive procedure (e.g., preserving normal organ tissue, decreasing morbidity, decreasing length of hospitalization). For patients who are not surgical candidates due to renal insufficiency or who have 1 kidney, preservation of renal function is important.

Potential complications of cryosurgery include those caused by hypothermic damage to normal tissue adjacent to the tumor, structural damage along the probe track, and secondary tumors if cancerous cells are seeded during probe removal.

Study Selection Criteria
Methodologically credible studies were selected using the following principles:

• To assess efficacy outcomes, comparative controlled prospective trials were sought, with a preference for RCTs.
• In the absence of such trials, comparative observational studies were sought, with a preference for prospective studies.
• To assess long-term outcomes and adverse events, single-arm studies that captured longer periods of follow-up and/or larger populations were sought.
• Studies with duplicative or overlapping populations were excluded.

Review of Evidence
Patients Who Are Surgical Candidates
Randomized Controlled Trials
There are no randomized controlled trials of cryoablation compared to surgery for kidney cancer.

Systematic Reviews
Multiple systematic reviews of comparative observational studies have compared cryoablation to partial nephrectomy in patients with early kidney cancer. This section summarizes the 3 most recent, relevant, and comprehensive reviews and meta-analyses, reported by Uhlig et al. (2019),¹ Klatte et al. (2014),² and Tang et al. (2014).³

Table 1. Cryoablation Studies Included in Systematic Reviews and Meta-Analyses Comparing Cryoablation to Partial Nephrectomy

Study	Uhlig et al. (2018)1	Klatte et al. (2014)2	Tang et al. (2014)3
Atwell et al. (2013)	⚫
Bhindi et al. (2017)	⚫
Camacho et al. (2016)	⚫
Caputo et al. (2017)	⚫
Chehab et al. (2016)	⚫
Danzig et al. (2015)	⚫
Desai et al. (2005)	⚫	⚫	⚫
Emara et al. (2014)	⚫	⚫	⚫
Foyil et al. (2008)	⚫
Guillotreau et al. (2012)	⚫	⚫	⚫
Haber et al. (2012)	⚫	⚫	⚫
Haramis et al. (2012)	⚫	⚫	⚫
Hegarty et al. (2006)	⚫
Hinshaw et al. 2016)	⚫
Hruby et al. (2006)		⚫	⚫
Kim et al. (2007)		⚫
Kiriluk et al. (2011)			⚫
Klatte et al. (2011)	⚫
Lian et al. (2010)		⚫
Lin et al. (2008)		⚫	⚫
Lughezzani et al. (2009)	⚫	⚫
Mason et al. (2017)	⚫
Nisbett et al. (2009)		⚫
O'Malley et al. (2007)	⚫	⚫	⚫
Panumatrassamee et al. (2013)	⚫
Tanagho et al. (2013)	⚫
Thompson et al. (2015)	⚫
Turna et al. (2009)	⚫	⚫
Weinberg et al. (2015)	⚫
Zechlinski et al. (2016)	⚫

Table 2. Systematic Reviews and Meta-Analyses Comparing Cryoablation to Partial Nephrectomy- Study Characteristics

Study	Search End Date	Study Inclusion Criteria	Studies Included	Mean Tumor size	Sample size	Follow-up Duration (months)
Uhlig et al. (2018)1	December 2017	Evaluated PN, RFA, cryoablation, or MWA for treatment of renal masses;Comparative study design contrasting at least 2 different interventions;Assessed at least 1 of the following end points: all-cause mortality, cancer-specific mortality, local recurrence, complications or change in renal function. Retrospective and prospective studies were included.	Total = 47 (24,077 patients) 13 prospective, 34 retrospective Cryoablation: 24 studies (668 patients)	Cryoablation: 2.53 cm PN: 2.84 cm MWA: 2.74 cm RFA: 2.63 cm	Cryoablation: 6,618 PN: 15,238 MWA: 344 RFA: 1,877	Range 3 to 82
Klatte et al. (2014)2	September 2013	Compared laparoscopic cryoablation with laparoscopic PN or robot-assisted laparoscopic PN for the treatment of small renal tumors; Reported perioperative outcomes or data on histology and oncologic outcomes were provided.	Total = 13 (1191 patients) All retrospective	Cryoablation: 2.28 cm PN: 2.41 cm	Cryoablation: 627 PN: 564	Mean Cryoablation: 22.5 PN: 29.5
Tang et al. (2014)3	September 2013	Compared laparoscopic cryoablation and laparoscopic PN for small renal masses; Reported on at least 1 of the following outcomes: operating time, estimated blood loss, length of hospital stay, blood transfusion rate, conversions rate, postoperative serum creatinine increase, postoperative glomerular filtration rate decrease, catheterization time, local recurrence, distant metastasis, and overall complications, including both intraoperative and postoperative minor and major complications; Clearly documented indications for resection of the renal tumor.	Total = 92 prospective, 7 retrospective	Not reported	Cryoablation: 555 PN: 642	Range Cryoablation: 11.9 to 44.5 PN: 4.8 to 42.7

MWA: microwave ablation; PN: partial nephrectomy; RFA: radiofrequency ablation

Uhlig et al. (2019) published a systematic review and meta-analysis comparing partial nephrectomy, radiofrequency ablation (RFA), cryoablation, and microwave ablation for small renal masses.¹ Forty-seven studies published between 2005 and 2017, with a total of 24,077 participants, were included. Of these, 24 studies conducted in 668 patients, compared cryoablation to partial or another ablative technique. Table 3 summarizes the results of the network meta-analysis for the comparison of cryoablation to partial nephrectomy.

No significant difference in cancer-specific mortality for partial nephrectomy (p = .8065), cryoablation (p = .5519), RFA (p = .3496), and microwave ablation (p = .2920) was found. Local recurrence was higher for cryoablation, RFA, and microwave ablation compared with partial nephrectomy (respectively, incidence rate ratio = 4.13; incidence rate ratio = 1.79; incidence rate ratio = 2.52; p < .05). There was a less pronounced decline in renal function for RFA compared with partial nephrectomy, cryoablation, and microwave (respectively, mean difference in glomerular filtration rate 6.49; 5.82; 10.89; p < .05).

Tang et al. (2014) reported on a systematic review and meta-analysis comparing renal laparoscopic renal cryoablation with laparoscopic partial nephrectomy in the treatment of small renal masses.³ Reviewers identified 9 trials (2 prospective, 7 retrospective) in which the 2 techniques were assessed (555 cases, 642 controls). Laparoscopic cryoablation was associated with statistically significant shorter surgical times, less blood loss, and fewer overall complications; however, it was estimated that laparoscopic partial nephrectomy might have a significantly lower local recurrence rate (odds ratio [OR] = 13.03; 95% confidence interval [CI], 4.20 to 40.39; p < .001) and lower distant metastasis rate (OR = 9.05; 95% CI, 2.31 to 35.51; p = .002).

Klatte et al. (2014) also reported on a systematic review and meta-analysis comparing laparoscopic renal cryoablation with laparoscopic partial nephrectomy for small renal tumors.^2, Thirteen nonrandomized studies were selected for analysis, which found cryoablation was associated with better perioperative outcomes than laparoscopic partial nephrectomy. Oncologic outcomes, however, were inferior with cryoablation, which was significantly associated with greater risk of local (relative risk, 9.39) and metastatic (relative risk, 4.68) tumor progression.

Table 3. Systematic Reviews and Meta-Analyses Comparing Cryoablation to Partial Nephrectomy — Study Results

Study	All-Cause Mortality	Cancer-Specific Mortality	Local Recurrence	Metastases	Complications	Decline in Renal Function
Uhlig et al. (2019)1
Network meta-analysis Cryoablation vs PN IRR (95% CI) P	2.58 (1.92 to 3.46) < .001	2.27 (0.79 to 6.49) .126	4.13 (2.28 to 7.47) .001	Not assessed	0.67 (0.48 to 0.92) .013	0.66 (-3.18 to 4.51) .736
I2 (P-value)	0% (.968)	0% (.8283)	29.4% (.6784)		59.9% (.003)	91.8% (.9001)
Klatte et al. (2014)2
Relative Risk (95% CI); P-value	Not assessed	Not assessed	Local Progression: 9.39 (3.83 to 22.98); < .0001	Metastatic Progression: 4.68 (1.88 to 11.64); < .001	Complications Total: 1.82 (1.22 to 2.72) Urological: 1.99 (1.10 to 3.63) Non-urological: 2.33 (1.42 to 3.84) Favors cryoablation	Not assessed
Tang et al. (2014)3
Odds Ratio/Weighted Mean Difference (95% CI); P-value	Not assessed	Not assessed	13.03 (4.20 to 40.39); < .001	9.05 (2.31 to 35.51);.002	Overall: 0.53 (0.29 to 0.98);.04 Major: 0.45 (0.25 to 0.81);.008 Minor: 0.65 (0.33 to 1.28);.21 Postoperative: 0.61 (0.32 to 1.15);.13 Intraoperative: 0.20 (0.07 to 0.58);.003	SCr % increase: -6.77 ( -13.79 to 0.24);.06 GFR decrease: -1.83 ( -7.61, 3.96);.44
I2 (P-value)			5% (.38)	0% (.79)	Overall: 61% (.009) Major: 0% (.48) Minor: 53% (.03) Postoperative: 60% (.01) Intraoperative: 0% (.89)	SCr % increase: 61% (.08) GFR decrease: 79% (.002)

CI: confidence interval; GFR: glomerular filtration rate; IRR: incidence rate ratio; PN: partial nephrectomy; SCr: serum creatinine

Comparative Observational Studies
This section summarizes recent comparative studies of cryoablation and partial nephrectomy not included in any of the systematic reviews discussed above.

Andrews et al. (2019) reported on 1798 patients with primary stage 1 renal masses treated with partial nephrectomy, percutaneous RFA, or percutaneous cryoablation between 2000 and 2011 at Mayo Clinic.⁴ A total of 1422 patients were treated with partial nephrectomy (n = 1055), RFA (n = 180), or cryoablation (n = 187) for stage 1a renal masses, and 376 patients were treated with partial nephrectomy (n = 324) or cryoablation (n = 52) for stage 1b renal masses. Comparisons of cryoablation to partial nephrectomy among 1422 patients with stage 1a masses resulted in hazard ratios (HRs) of 1.88 (95% CI 0.76 to 4.66, p = .18), 0.23 (95% CI, 0.03 to 1.72, p = .15), and 0.29 (95% CI, 0.01 to 6.11, p = .40) for local recurrence, metastases, and death from renal cell carcinoma. Five-year cancer-specific survival was 99%, 96%, and 100% for partial nephrectomy, RFA, and cryoablation, respectively. Among 376 stage 1b patients, 324 and 52 underwent partial nephrectomy and cryoablation with median clinical follow-up of 8.7 and 6.0 years, respectively. Comparisons of cryoablation with partial nephrectomy resulted in HRs of 1.22 (95% CI, 0.33 to 4.48, p = .80), 0.95 (95% CI, 0.21 to 4.38, p > .90), and 1.94 (95% CI, 0.42 to 8.96, p = .40) for local recurrence, metastases, and death from renal cell carcinoma, respectively. Five-year cancer specific survival was 98% and 91% for partial nephrectomy and cryoablation, respectively.

A retrospective, nonrandomized analysis of prospectively collected data compared robot-assisted partial nephrectomy with percutaneous ablation in patients with T1b renal cell carcinoma. Rembeyo et al. (2020) compared patients treated with robot-assisted partial nephrectomy (n = 36), cryoablation (n = 55), and RFA (n = 11).⁵ Median tumor sizes in each group were 4.5, 4.6, and 4.2 cm, respectively, and median follow-up times were 23.7, 19.9, and 51.3 months. Compared with partial nephrectomy, local recurrence-free survival was significantly shorter with cryoablation (adjusted HR, 4.3; 95% CI, 1.78 to 10.37). Two-year local recurrence-free survival rates for the partial nephrectomy, cryoablation, and RFA groups were 89.1%, 73.5%, and 81.8%, respectively (p < .001).

A retrospective, nonrandomized study also compared partial nephrectomy with cryoablation and RFA, specifically in patients with T1aN0M0 renal cell carcinoma with tumor size ≤ 4 cm. Yan et al. (2019), using Medicare Surveillance, Epidemiology, and End Results (SEER) data, compared OS and cancer-specific survival in patients treated with partial nephrectomy (n = 15,395), cryoablation (n = 1,381), and RFA (n = 457).⁶ Median follow-up was 30 months in all groups. Overall survival was significantly improved with partial nephrectomy compared with cryoablation (HR, 2.995; 95% CI, 2.363 to 3.794) and RFA (HR, 4.085; 95% CI, 2.683 to 6.220). Similarly, cancer-specific survival was significantly improved with partial nephrectomy compared with cryoablation (HR, 3.562, 95% CI, 1.399 to 6.220) and RFA (HR, 3.457; 95% CI, 2.043 to 5.850). In subgroup analyses of patients with tumor size ≤ 2 cm, OS was again significantly improved with partial nephrectomy versus cryoablation (HR 1.958; 95% CI, 1.204 to 3.184) and RFA (HR, 2.841; 95% CI, 1.211 to 6.662); however, cancer-specific survival was not different. In patients with tumor size 2 to 4 cm, OS was significantly improved with partial nephrectomy versus cryoablation (HR 3.284; 95% CI, 2.513 to 4.292) and versus RFA (HR, 4.497; 95% CI, 2.782 to 7.269), as was cancer-specific survival (partial nephrectomy vs. cryoablation: HR, 3.536; 95% CI, 2.006 to 6.234; partial nephrectomy vs RFA: HR, 4.339; 95% CI, 1.573 to 11.971).

Another analysis of Medicare SEER data retrospectively compared partial nephrectomy with cryoablation in patients with T1b nonmetastatic renal cell carcinoma. Pecoraro et al. (2019) compared patients undergoing cryoablation (n = 434) with propensity score-matched patients undergoing partial nephrectomy (n = 228).⁷ In patients treated with cryoablation versus partial nephrectomy at 5 years, cancer-specific mortality rates were 7.6% versus 2.8%, respectively (p = .02), and other-cause mortality rates were 17.9% versus 11.8% (p = .1). Findings were consistent in multivariable analyses, where other-cause mortality remained nonsignificant, and cryoablation was associated with higher risk of mortality (adjusted HR, 2.50).

Section Summary: Patients Who Are Surgical Candidates
Multiple comparative observational studies and systematic reviews of these studies have compared cryoablation to partial nephrectomy for early stage renal cancer. These studies have consistently found that partial nephrectomy is associated with better oncological outcomes than cryosurgery.

Patients who Are Not Surgical Candidates
There are no RCTs or comparative observational studies comparing cryoablation to active surveillance in patients with kidney cancer.

Systematic Reviews
Although there are no systematic reviews directly comparing cryoablation with active surveillance in patients who are not surgical candidates, multiple systematic reviews of cryoablation compared to surgery or other ablative strategies have reported on outcomes in patients who received cryoablation for kidney tumors. These reviews consistently found that although oncological outcomes were better with surgery, cryoablation was associated with better perioperative outcomes, lower incidence of complications, and less decline in kidney function (see Table 2).

Case Series
In a review of strategies for treating stage 1 renal cell carcinoma, Cronan et al. (2019) identified 17 articles published since 2010 describing 2,320 lesions treated with cryoablation.⁸ Mean tumor size was 2.6 cm. The overall recurrence rate was 8.1% in studies with overall median follow-up of 41.4 months, and the technical success rate was 94.3%. Five-year OS and cancer-specific survival rates were 77.1% to 97.8% and 88% to 100%, respectively. Of the 568 lesions treated since 2016, the local recurrence rate was 3.0%. Renal function was not assessed in this review.

Recent case series have shown shown cryoablation associated with good oncological outcomes and preservation of renal function (Table 4).

In a single-center series reported by Morkos et al. (2020), 5 of 132 patients (3.8%) transitioned to hemodialysis.⁹ The dialysis-free probability was 98% (95% CI, 0.95 to 1) at 5 years, and 95% (95% CI, 0.89 to 1) at 10 years.

In a series of 338 patients treated at 4 centers in Italy, Stacul et al. (2021) reported that 93.3% of patients treated with cryoablation did not experience a significant decrease in renal function.¹⁰

Table 4. Renal Function Outcomes in Longer-Term Observational Studies and Case Series of Cryoablation for Kidney Tumors

Study	Setting	N	Mean Tumor Size	Follow-up Duration	Oncological Outcomes	Renal Function Outcomes
Morkos et al. (2020)9	Single center	134	2.8 cm (SD+1.4 cm); range, 0.5 to 7.0 cm	10 years	Survival: 87% (95% CI, 80% to 93%) at 5 years; 72% (95% CI, 62% to 83%) at 10 years RFS: 85% (95% CI, 79% to 91%) at 5 years; 69% (95% CI, 59% to 79%) at 10 years Disease-specific survival: 94% (95% CI, 90% to 98%) at both 5 years and 10 years.	5 of 132 (3.8%) transitioned to hemodialysis Dialysis-free probability (95% CI): At 5 years: 98% (95% to 100%) At 10 years: 95% (89% to 100%)
Stacul et al. (2021)10	4 centers in North-Eastern Italy	338	2.53 cm	5 years	RFS: 90.5% (95% CI ,83.0% to 94.9%) at 3 years and 82.4% (95% CI, 72.0% to 89.4%) at 5 years OS: 96.0% (95% CI, 90.6% to 98.3%) at 3 years and 91.0% (95% CI, 81.7% to 95.7%) at 5 years	Cryoablation was not associated with a significant decrease in renal function after treatment in 93.3%

CI: confidence interval; OS: overall survival; RFS: recurrence-free survival

Section Summary: Patients who Are Not Surgical Candidates
The evidence on cryoablation in patients with kidney cancer who are not surgical candidates consists of comparative observational studies of cryoablation compared to partial nephrectomy or other ablative techniques, systematic reviews of these studies, and case series. Although oncological outcomes were better with surgery, cryoablation was associated with less decline in kidney function. Recent case series totaling more than 400 patients showed cryoablation was associated with good oncological outcomes and preservation of renal function.

Non-Small Cell Lung Cancer
Clinical Context and Therapy Purpose
The purpose of cryoablation is to provide a treatment option that is an alternative to or an improvement on existing therapies in patients with non-small cell lung cancer (NSCLC).

The question addressed in this evidence review is: Does cryoablation of lung tumors improve the net health outcome in patients with NSCLC?

The following PICO was used to select literature to inform this review

Population
The relevant population of interest is individuals with NSCLC.

The review of evidence addresses the use of cryoablation in 2 populations of patients who have NSCLC:

1. Patients with NSCLC who are not surgical candidates
2. Patients with NSCLC who require palliation for a central airway obstructing lesion

Interventions
The therapy being considered is cryoablation, also referred to as cryosurgery.

Cryoablation involves freezing of target tissues; this is most often performed by inserting a coolant-carrying probe into the tumor. Cryosurgery may be performed as an open surgical technique or as a closed procedure under laparoscopic or ultrasound guidance.

Comparators
For medically operable NSCLC, surgery is preferred. For patients who are medically inoperable, who refuse surgery, or who are high-risk surgical candidates, radiation therapy has a potential role, as either definitive or palliative therapy.

For patients who require palliation for a central airway obstructing lesion, standard symptom palliative care is radiation. Chemotherapy, stent placement, and other ablative bronchoscopic therapies are also options.

Outcomes
The general outcomes of interest are OS, disease-specific survival, quality of life, and treatment-related morbidity.

The hypothesized advantages of cryosurgery for NSCLC include improved local control and benefits common to any minimally invasive procedure (eg, preserving normal organ tissue, decreasing morbidity, decreasing length of hospitalization).

Potential complications of cryosurgery include those caused by hypothermic damage to normal tissue adjacent to the tumor, structural damage along the probe track, and secondary tumors if cancerous cells are seeded during probe removal.

Study Selection Criteria
Methodologically credible studies were selected using the following principles:

• Comparative controlled prospective trials were sought, with a preference for RCTs.
• In the absence of such trials, comparative observational studies were sought, with a preference for prospective studies.
• To assess long-term outcomes and adverse events, single-arm studies that captured longer periods of follow-up and/or larger populations were sought.
• Studies with duplicative or overlapping populations were excluded.

Review of Evidence
Patients with Non-Small Cell Lung Cancer who are not Surgical Candidates
Systematic Reviews
Lee et al. (2011) conducted a systematic review of endoscopic cryoablation of lung and bronchial tumors.¹¹ Included in the review were 15 case studies and a comparative observational study. Cryoablation was performed for inoperable, advanced lung and bronchial cancers in most studies. Some studies included patients with comorbid conditions and poor general health who would not be considered surgical candidates. Complications occurred in 11.1% of patients (10 studies) and consisted of hemorrhage, mediastinal emphysema, atrial fibrillation, and dyspnea. Within 30 days of the procedure, death from hemoptysis and respiratory failure, considered to be most likely related to disease progression, occurred in 7.1% of patients.

Niu et al. (2012) reviewed the literature on lung cryoablation and reported on their own experience with percutaneous cryoablation in 150 patients with NSCLC followed for 12 to 38 months.¹² The study population had stage IIIB or IV lung cancer. Overall survival rates at 1, 2, and 3 years were 64%, 45%, and 32%, respectively. Thirty-day mortality was 2.6% and included cardiac arrest and hemopneumothorax. Complications included hemoptysis, pneumothorax, hemothorax, pleural effusion, and pulmonary infection.

Nonrandomized Studies
The Study of Metastatic Lung Tumors Targeted by Interventional Cryoablation Evaluation (SOLSTICE) assessed the safety and local recurrence-free survival after cryoablation for treatment of pulmonary metastases. Callstrom et al. (2020) performed this multicenter, prospective, single-arm, phase 2 study in 128 patients with 224 lung metastases ≤ 3.5 cm.¹³ Median tumor size was 1.0 cm. Local recurrence-free response was 85.1% at 12 months and 77.2% at 24 months. Secondary local recurrence-free response after retreatment with cryoablation for recurrent tumors was 91.1% at 12 months and 84.4% at 24 months. Overall survival at 12 and 24 months was 97.6% and 86.6%, respectively.

The Evaluating Cryoablation of Metastatic Lung/Pleura Tumors in Patients-Safety and Efficacy trial was a prospective, multicenter trial of cryoablation for metastatic disease in the lungs; interim results at 1-year follow-up were published by de Baere et al. (2015).¹⁴ The trial enrolled 40 patients with 60 metastatic lung lesions who were treated with cryoablation and had at least 12 months of follow-up. Outcomes included survival, local tumor control, quality of life, and complications. Local tumor control was achieved in 94.2% (49/52) of treated lesions, and the 1-year OS rate was 97.5% (39/40). There were no significant changes in quality of life over the 12-month study. The most common adverse event was pneumothorax requiring chest tube intubation in 18.8% (9/48 procedures). No subsequent analyses have been identified.

Moore et al. (2015) reported on a prospective consecutive series of 45 patients (47 tumors) managed with cryoablation during a 5-year period (2006 – 2011).¹⁵ All patients had biopsy-confirmed early-stage (T1a and T1b) primary lung tumors and had been assessed by a tumor board to be medically inoperable. Lesions were as small as 5 mm, with an average of 1.9 cm (range, 0.5 – 3 cm). Cryoablation was performed under general anesthesia. The primary endpoint was the completion of the freeze-thaw cycle. Mean follow-up was 51 months, with an observed 5-year survival rate of 67.8%, 5-year cancer-specific survival rate of 56.6%, and 5-year progression-free survival rate of 87.9%. There were 7 (14.8%) local recurrences; 2 had device failure and retreatment, and another had retreatment for a tumor recurrence at 1 year after initial treatment. The ablation zone was less than 5 mm outside the margin of the tumor in 5 of the 47 treatments, and 4 of these 5 had local recurrences. Complications primarily included 19 (40%) patients with hemoptysis, 2 of which required bronchoscopy, and 24 (51%) cases of pneumothorax, 1 of which required surgical chest intubation with prolonged placement and mechanical sclerosis. These 3 (6.4%) patients were considered major complications, but there were no reports of 30-day mortality.

Section Summary: Patients With Non-Small Cell Lung Cancer Who Are not Surgical Candidates
Medically inoperable patients with early stage primary lung tumors were treated with cryoablation in a consecutive series of 45 patients. Five year survival was 68%; the main complications were hemoptypsis in 40% of patients and pneumothorax in 51%. A prospective single arm Phase 2 study of 128 patients reported on cryoablation for treatment of metastases to the lung. Cryoablation for metastatic lung cancer was studied in a single arm trial in 40 patients.

Patients With Non-Small Cell Lung Cancer Who Require Palliation for a Central Airway Obstructing Lesion
Systematic Review
Ratko et al. (2013) conducted a comparative effectiveness review on local nonsurgical therapies for stage I and symptomatic obstructive NSCLC for the Agency for Healthcare Research and Quality.¹⁶ Cryoablation was included as a potential therapy for airway obstruction due to endoluminal NSCLC. The reviewers identified 1 RCT that randomly allocated patients to external beam radiation therapy or endobronchial treatment (clinician choice of any one endobronchial treatment: brachytherapy, laser therapy or cryotherapy). The trial was discontinued before completion due to lack of patient accrual, and therefore the reviewers did not include the trial in their report. Reviewers were unable to draw any conclusions about local nonsurgical therapies, including cryoablation, due to lack of quality evidence.

Consecutive Case Series
Maiwand and Asimakopoulos (2004) reported on a consecutive series of 521 patients with symptomatic obstructive tracheobronchial malignant tumors who underwent cryosurgery with a mean of 2.4 treatments per patient.¹⁷ The patients were treated between 1995 and 2003, had a mean age of 67.9 years, and 72% were diagnosed with stage IIIB or IV disease. Improvement in 1 or more symptoms (hemoptysis, cough, dyspnea, chest pain) was demonstrated in 86.0% of patients. Postoperative complications were 9%, including 21 (4%) cases of hemoptysis, 12 (2%) cases of postoperative atrial fibrillation, and 16 (3%) patients developed respiratory distress and poor gas exchange that eventually resolved. There were 7 (1.2%) in-hospital deaths (cause of death was a respiratory failure in all 7 patients).

This study has several limitations, which are summarized in Tables 5 and 6.

Table 5. Study Relevance Limitations

Study	Populationa	Interventionb	Comparatorc	Outcomesd	Duration of Follow-upe
Maiwand and Asimakopoulos (2004)17	3. Patients were treated 20 to 30 years ago	1. Patients were treated 20 to 30 years ago; replicable across other institutions.	2. No comparator; radiation is standard of care and other treatment options are available.	5. No description of what size improvement is important	1,2. The duration of follow-up was not described for the 521 patients (it was described for the 15 with cryosurgery at exploratory thoracotomy but those are not relevant here). The timing of the outcome measures is unclear. It is unclear if patients were evaluated on a standard schedule and at what time point improvements were seen.

The study limitations stated in this table are those notable in the current review; this is not a comprehensive gaps assessment. 
^a Population key: 1. Intended use population unclear; 2. Clinical context is unclear; 3. Study population is unclear; 4. Study population not representative of intended use.
^b Intervention key: 1. Not clearly defined; 2. Version used unclear; 3. Delivery not similar intensity as comparator; 4.Not the intervention of interest.
^c Comparator key: 1. Not clearly defined; 2. Not standard or optimal; 3. Delivery not similar intensity as intervention; 4. Not delivered effectively.
^d Outcomes key: 1. Key health outcomes not addressed; 2. Physiologic measures, not validated surrogates; 3. No CONSORT reporting of harms; 4. Not establish and validated measurements; 5. Clinical significant difference not prespecified; 6. Clinical significant difference not supported.
^e Follow-Up key: 1. Not sufficient duration for benefit; 2. Not sufficient duration for harms.

Table 6. Study Design and Conduct Limitations

Study	Allocationa	Blindingb	Selective Reportingc	Data Completenessd	Powere	Statisticalf
Maiwand and Asimakopoulos (2004)17	4. No comparator, not randomized. Not clear why these patients were chosen for cryosurgery versus one of the other procedures that are available for these patients (selection bias) at this institution.	3. No blinding. All of these measures are subjective. Although these symptoms would likely not improve without treatment, the symptom reports and physician assessment of performance status are potentially biased which is complicated by the fact that there is no comparator.		1. No description of patient flow or the amount of available data for any of the outcome measures.

The study limitations stated in this table are those notable in the current review; this is not a comprehensive gaps assessment.
^a Allocation key: 1. Participants not randomly allocated; 2. Allocation not concealed; 3. Allocation concealment unclear; 4. Inadequate control for selection bias.
^b Blinding key: 1. Not blinded to treatment assignment; 2. Not blinded outcome assessment; 3. Outcome assessed by treating physician.
^c Selective Reporting key: 1. Not registered; 2. Evidence of selective reporting; 3. Evidence of selective publication.
^d Data Completeness key: 1. High loss to follow-up or missing data; 2. Inadequate handling of missing data; 3. High number of crossovers; 4. Inadequate handling of crossovers; 5. Inappropriate exclusions; 6. Not intent to treat analysis (per protocol for noninferiority trials).
^e Power key: 1. Power calculations not reported; 2. Power not calculated for primary outcome; 3. Power not based on clinically important difference.
f Statistical key: 1. Analysis is not appropriate for outcome type: (a) continuous; (b) binary; (c) time to event; 2. Analysis is not appropriate for multiple observations per patient; 3. Confidence intervals a

Section Summary: Patients With Non Small Cell Lung Cancer Who Require Palliation for a Central Airway Obstructing Lesion
There are no comparative studies. A case series of 521 consecutive patients reported improvement in symptoms in 86% of patients, but multiple study design, conduct, and relevance limitations preclude drawing conclusions about efficacy or safety of cryoablation in this population.

Solid Tumors Located in the Breast, Pancreas, or Bone
Clinical Context and Therapy Purpose
The purpose of cryoablation is to provide a treatment option that is an alternative to or an improvement on existing therapies in patients with solid tumors in the breast, pancreas, or bone.

The question addressed in this evidence review is: Will cryoablation of tumors in the breast, pancreas, or bone improve the net health outcome?

The following PICO was used to select literature to inform this review.

Population
The relevant population of interest is individuals with tumors in the breast, pancreas, or bone.

Interventions
The therapy being considered is cryoablation, also referred to as cryosurgery.

Cryoablation involves freezing of target tissues; this is most often performed by inserting a coolant-carrying probe into the tumor. Cryosurgery may be performed as an open surgical technique or as a closed procedure under laparoscopic or ultrasound guidance.

Comparators
Comparators of interest include surgical resection, other ablative techniques such as laser surgery, RFA, irreversible electroporation, and argon beam coagulation.

Regarding tumors located in the breast, the selection of lumpectomy, modified radical mastectomy, or another approach is balanced against the patient's desire for breast conservation, the need for tumor-free margins in resected tissue, and the patient's age, hormone receptor status, and other factors.

Palliative treatments for bone metastases include analgesics, opioids, osteoclast inhibitors, and radiation therapy.

Outcomes
The general outcomes of interest are OS, disease-specific survival, quality of life, and treatment-related morbidity.

The hypothesized advantages of cryosurgery include improved local control and benefits common to any minimally invasive procedure (e.g., preserving normal organ tissue, decreasing morbidity, decreasing length of hospitalization).

Potential complications of cryosurgery include those caused by hypothermic damage to normal tissue adjacent to the tumor, structural damage along the probe track, and secondary tumors if cancerous cells are seeded during probe removal.

Study Selection Criteria
Methodologically credible studies were selected using the following principles:

• Comparative controlled prospective trials were sought, with a preference for RCTs.
• In the absence of such trials, comparative observational studies were sought, with a preference for prospective studies.
• To assess long-term outcomes and adverse events, single-arm studies that captured longer periods of follow-up and/or larger populations were sought.
• Studies with duplicative or overlapping populations were excluded.

Review of Evidence
Breast Tumors
Systematic Reviews
Zhao and Wu (2010) reported on a systematic review of minimally invasive ablative techniques of early-stage breast cancer.¹⁸ They noted that studies assessing cryoablation for breast cancer were primarily pilot and feasibility studies. Complete ablation of tumors was reported within a wide range (36% – 83%). Reviewers raised many areas of uncertainty, including patient selection criteria and the ability to precisely determine the size of tumors and achieve 100% tumor cell death. They suggested minimally invasive thermal ablation techniques for breast cancer treatment, including cryoablation, be limited until results from prospective, RCTs become available.

Randomized Controlled Trials
A prospective, single-arm, phase 2 trial was published by Simmons et al. (2016) for the American College of Surgeons Oncology Group Z1072.¹⁹ This trial enrolled 86 evaluable patients from 19 institutions with invasive ductal breast carcinoma that was 2 cm or less in size. The primary endpoint was complete ablation, defined as no residual evidence of tumor on magnetic resonance imaging. The investigators assigned a priori the success rates indicating that cryoablation would be a potentially efficacious treatment (> 90%) or that the results of cryoablation would be unsatisfactory (< 70%). Following cryoablation and determination of complete ablation, all patients underwent surgery according to standard protocols for treatment of early breast cancer. Of 87 cancers in 86 patients, complete ablation was achieved in 66 (75.9%; 95% CI, 67.1% to 83.2%). Most cases without complete ablation were the result of multifocal disease outside the targeted lesion.

Nonrandomized Studies
Niu et al. (2013) reported on a retrospective study of 120 patients with metastatic breast cancer, including 30 metastases to the contralateral breast and other metastases to the lung, bone, liver, and skin treated with chemotherapy (n = 29) or cryoablation (n = 91; 35 of whom also received immunotherapy).²⁰ At 10-year follow-up, the median OS of all study participants was 55 months in the cryoablation group versus 27 months in the chemotherapy group (p < .001). Moreover, the median OS was greater in patients receiving multiple cryoablation and in those receiving immunotherapy. Complications with cryotherapy to the breast included ecchymosis and hematoma, pain, tenderness, and edema; all of these complications resolved within 1 week to 1 month.

In a case series by Manteni et al. (2011), who assessed 15 breast cancer patients, percutaneous cryoablation was performed 30 to 45 days before surgical resection.²¹ Resection of the lesions confirmed that complete necrosis had occurred in 14 patients, but 1 lesion had residual disease considered to be due to incorrect probe placement. In a small series of 11 patients with breast cancer tumors less than 2 cm in diameter, Pusztaszeri et al. (2007) found residual tumors present in 6 cases when follow-up lumpectomies were performed approximately 4 weeks after cryoablation.²² A case series by Sabel et al. (2004) explored the role of cryoablation as an alternative to surgical excision as a primary treatment for early-stage breast cancer.²³ This phase 1 study included 29 patients who underwent cryoablation of primary breast cancers measuring less than 2 cm in diameter, followed 1 to 4 weeks later by standard surgical excision. Cryoablation was successful in patients with invasive ductal carcinoma less than 1.5 cm in diameter, and with less than 25% ductal carcinoma in situ identified in a prior biopsy specimen.

Other studies have described outcomes from cryosurgery for advanced primary or recurrent breast cancer.^24,25,26,27 Collectively, these reports either did not adequately describe selection criteria for trial enrollees, procedure details, or procedure-related adverse events or had inadequate study designs, analyses, and reporting of results.

Breast Fibroadenomas
A variety of case series has focused on the role of cryosurgery as an alternative to surgical excision of benign fibroadenomas. Kaufman et al. (2002-2005) have published several case series on office-based ultrasound-guided cryoablation as a treatment of breast fibroadenomas.^{28,29,30,31,32} These case series reported on a range of 29 to 68 patients followed for 6 months to 2.6 years. It is likely that these case series included overlapping patients. At 1 year, patients reported 91% patient satisfaction and fibroadenomas became nonpalpable in 75% of cases. At follow-up averaging 2.6 years in 37 patients, the authors noted only 16% of 84% palpable fibroadenomas remained palpable after treatment and, of the fibroadenomas initially 2 cm or less in diameter, only 6% remained palpable.³² In this series, the authors also noted that cryoablation did not produce artifacts that could interfere with the interpretation of mammograms. These small case series, which were done by the same group of investigators, are inadequate to permit scientific conclusions.

Nurko et al. (2005) reported on outcomes at 6 and 12 months for 444 treated fibroadenomas reported to the FibroAdenoma Cryoablation Treatment registry by 55 different practice settings.³³ In these patients, before cryoablation, 75% of fibroadenomas were palpable by the patient. Follow-up at 6- and 12-month intervals showed palpable masses in 46% and 35%, respectively. When fibroadenomas were grouped by size, the treatment area was palpable in 28% of subjects for lesions 2 cm or less in diameter and 59% for lesions more than 2 cm at 12 months.

Section Summary: Breast Tumors
For the treatment of primary and recurrent breast cancer, available evidence has shown that complete ablation can be achieved in most cases for variably defined small tumors, but studies have not included control groups or compared outcomes of cryosurgery with alternative strategies for managing similar patients. Therefore, no conclusions can be made on the net health outcome of cryosurgery for breast cancer. For the treatment of fibroadenomas, there is a small body of evidence. This evidence has demonstrated that most fibroadenomas become "nonpalpable" following cryoablation. However, there is a lack of comparative trials. Comparative trials are needed to assess this technology and determine how this approach compares with surgery, as well as with vacuum-assisted excision and observation (approximately one-third of fibroadenomas regress over time after cryoablation).

Pancreatic Cancer
Systematic Reviews
Tao et al. (2012) reported on a systematic review of cryoablation for pancreatic cancer.³⁴ Reviewers identified 29 studies and included 5. All 5 were case series and considered of low quality. Adverse events, when mentioned, included delayed gastric emptying (0% – 40.9% in 3 studies), pancreatic leak (0% – 6.8% in 4 studies), biliary leak (0% – 6.8% in 3 studies), and a single instance of upper gastrointestinal hemorrhage. Pain relief was reported in 3 studies and ranged from 66.7% to 100%. Median survival times reported in 3 studies ranged from 13.4 to 16 months. One-year total survival rates, as reported in 2 studies, were 57.5% and 63.6%. Keane et al. (2014) reported on a systematic review of ablation therapy for locally advanced pancreatic cancer.³⁵ Reviewers noted that studies had demonstrated ablative therapies, including cryoablation, are feasible, but larger studies are needed. No conclusions could be made on whether ablation resulted in better outcomes than best supportive care.

Nonrandomized Trials
Li et al. (2011) reported on a retrospective study of 142 patients with unresectable pancreatic cancer treated with a palliative bypass with (n = 68) or without cryoablation (n = 74) from 1995 to 2002.³⁶ Median dominant tumor sizes decreased from 4.3 to 2.4 cm in 36 (65%) of 55 patients 3 months after cryoablation. Survival rates did not differ significantly between groups, with the cryoablation group surviving a median of 350 days versus 257 days in the group without cryoablation. Complications did not differ significantly between groups. However, a higher percentage of delayed gastric emptying occurred in the cryoablation group (36.8%) than in the group without cryoablation (16.2%).

A pilot study assessing combination cryosurgery plus iodine 125 seed implantation for treatment of locally advanced pancreatic cancer was reported by Xu et al. (2008).³⁷ Forty-nine patients enrolled in the pilot study, and 12 had liver metastases; 20 patients received regional chemotherapy. At 3 months post-therapy, most patients showed tumor necrosis, with 20.4% having a complete response. Overall, the 6-, 12-, 24-, and 36-month survival rates were 94.9%, 63.1%, 22.8%, and 9.5%, respectively.

Kovach et al. (2002) reported on 10 cryoablations in 9 patients with unresectable pancreatic cancer using intraoperative ultrasound guidance during laparotomy.38, The authors reported adequate pain control in all patients postoperatively and no intraoperative morbidity or mortality. At publication, all patients had died at an average of 5 months postoperatively (range, 1-11 months).

Section Summary: Pancreatic Cancer
The available evidence on cryosurgery for pancreatic cancer consists of retrospective case series that used cryosurgery for palliation of inoperable disease and a systematic review of these studies. These studies reported that pain relief was achieved in most cases and that complications (e.g., delayed gastric emptying) are common but the true rate of complications is uncertain. Because these studies did not include control groups or compare outcomes of cryosurgery with alternative strategies for managing similar patients, no conclusions can be made on the net health outcome of cryosurgery for pancreatic cancer.

Bone Cancer and Bone Metastases
Review of Evidence
Meller et al. (2008) retrospectively analyzed a single-center experience with 440 bone tumor cryosurgery procedures performed between 1988 and 2002, two-thirds of them for primary benign-aggressive and low-grade malignant lesions, and one-third for primary high-grade and metastatic bone tumors.³⁹ At a median follow-up of 7 years (range, 3 – 18 years), the overall recurrence rate was 8%. Based on their data, the authors suggested that the ideal case for cryosurgery is a young adult with involvement of long bone, a benign-aggressive or low-grade malignant bone tumor, a good cavity with greater than 75%-thick surrounding walls, no or minimal soft-tissue component, and at least ±1 cm of subchondral bone left near a joint surface after curettage and burr drilling.

Callstrom et al. (2013) reported on 61 patients treated with cryoablation for pain from 69 tumors (size, 1-11 cm) metastatic to the bone.⁴⁰ Before treatment, patients rated their pain with a 4+ on a 1-to-10 scale using the Brief Pain Inventory, with a mean score of 7.1 for worst pain in a 24-hour period. The mean pain score gradually decreased after cryoablation to 1.4 (p < .001) at 24 weeks for worst pain in a 24-hour period. A major complication of osteomyelitis was experienced by 1 (2%) patient.

Jennings et al. (2021) reported on a multicenter, single-arm prospective study of 66 patients with metastatic bone disease who were treated with cryoablation, all of whom were not candidates for or had not benefited from standard therapy.⁴¹ The primary endpoint was the change in pain score from baseline to week 8 and patients were followed for 24 weeks. The mean decrease in pain score from baseline to week 8 was 2.61 points (95% CI 3.45 to 1.78). Pain scores decreased further after the primary endpoint and reached clinically meaningful levels (more than a 2-point decrease) after week 8. This study was limited by its lack of a comparator, potential for selection bias, and lack of blinding combined with subjective outcome measures.

Section Summary: Bone Cancers and Bone Metastases
There is a small amount of literature on cryoablation for bone cancer and bone metastases. For bone metastases, the evidence base consists of 2 single arm nonrandomized studies (N = 61 and 66) and is inadequate to determine efficacy. Studies were limited by a lack of a comparator, potential for selection bias, and lack of blinding combined with subjective outcome measures.

Summary of Evidence
For individuals with early stage kidney cancer who are surgical candidates treated with cryoablation, the evidence includes comparative observational studies and systematic reviews. Relevant outcomes are OS, disease-specific survival, quality of life, and treatment-related morbidity. Multiple comparative observational studies and systematic reviews of these studies have compared cryoablation to partial nephrectomy for early stage renal cancer. These studies have consistently found that partial nephrectomy is associated with better oncological outcomes than cryosurgery, but cryosurgery was associated with better perioperative outcomes, lower incidence of complications, and less decline in kidney function. The evidence is insufficient to determine that the technology results in an improvement in the net health outcome.

For individuals with early stage kidney cancer who are not surgical candidates and who are treated with cryoablation, the evidence includes comparative observational studies of cryoablation compared to partial nephrectomy or other ablative techniques, systematic reviews of these studies, and case series. Relevant outcomes are OS, disease-specific survival, quality of life, and treatment-related morbidity. Although oncological outcomes were better with surgery, in comparative observational studies, cryoablation was associated with less decline in kidney function. Recent case series totaling more than 400 patients showed cryoablation was associated with good oncological outcomes and preservation of renal function. The evidence is sufficient to determine that the technology results in an improvement in the net health outcome.

For individuals with NSCLC who are not surgical candidates, the evidence includes uncontrolled observational studies and case series. Relevant outcomes are OS, disease-specific survival, quality of life, and treatment-related morbidity. Medically inoperable patients with early stage primary lung tumors were treated with cryoablation in a consecutive series of 45 patients. Five year survival was 68%; the main complications were hemoptysis in 40% of patients and pneumothorax in 51%. A prospective single arm Phase 2 study of 128 patients reported on cryoablation for treatment of metastases to the lung. Cryoablation for metastatic lung cancer was studied in a single arm trial in 40 patients. The evidence is insufficient to determine that the technology results in an improvement in the net health outcome.

For individuals with with NSCLC who require palliation for a central airway obstructing lesion who are treated with cryoablation, the evidence includes case series. Relevant outcomes are OS, disease-specific survival, quality of life, and treatment-related morbidity. There are no comparative studies. A series of 521 consecutive patients reported improvement in symptoms in 86% of patients, but multiple study design, conduct, and relevance limitations preclude drawing conclusions about efficacy or safety of cryoablation in this population. The evidence is insufficient to determine that the technology results in an improvement in the net health outcome.

For individuals with solid tumors located in the breast, pancreas, or bone who are treated with cryoablation, the evidence includes uncontrolled observational studies and case series. Relevant outcomes are OS, disease-specific survival, quality of life, and treatment-related morbidity. Due to the lack of prospective controlled trials, it is not possible to conclude that cryoablation improves outcomes for any indication better than alternative treatments. The evidence is insufficient to determine that the technology results in an improvement in the net health outcome.

The purpose of the following information is to provide reference material. Inclusion does not imply endorsement or alignment with the evidence review conclusions.

Clinical Input From Physician Specialty Societies and Academic Medical Centers
While the various physician specialty societies and academic medical centers may collaborate with and make recommendations during this process, through the provision of appropriate reviewers, input received does not represent an endorsement or position statement by the physician specialty societies or academic medical centers, unless otherwise noted.

2017 Input
Clinical input was sought to help determine whether the use of cryoablation for individuals with non small cell lung cancer (NSCLC)who are either poor surgical candidates or who required palliation for a lesion obstructing the central airway would provide a clinically meaningful improvement in net health outcome and whether the use is consistent with generally accepted medical practice. In response to requests, clinical input was received from 9 respondents, including 2 specialty society-level responses, 3 physician-level responses identified by specialty societies, and 4 physicians identified by 1 health system.

For individuals with NSCLC who are either poor surgical candidates or who required palliation for a lesion obstructing the central airway who receive cryoablation, clinical input supports this use provides a clinically meaningful improvement in net health outcome and indicates this use is consistent with generally accepted medical practice.

2009 Input
In response to requests, input was received from 2 physician specialty societies (5 reviews) and from 2 academic medical centers (3 reviews) while this policy was under review in 2009. There was strong support for the use of cryoablation in the treatment of select patients with renal tumors. There also was support for its use in the treatment of benign breast disease. Reviewers generally agreed cryoablation was investigational in the treatment of pancreatic cancer.

Practice Guidelines and Position Statements
Guidelines or position statements will be considered for inclusion in Supplemental Information if they were issued by, or jointly by, a U.S. professional society, an international society with U.S. representation, or National Institute for Health and Care Excellence (NICE). Priority will be given to guidelines that are informed by a systematic review, include strength of evidence ratings, and include a description of management of conflict of interest.

American College of Radiology
The American College of Radiology Appropriateness Criteria (2009, updated 2019) for post-treatment follow-up and active surveillance of renal cell carcinoma [RCC] indicated that "Ablative therapies, such as radiofrequency ablation, microwave ablation, and cryoablation, have been shown to be an effective and safe alternative [to surgical resection] for the treatment of small, localized RCCs."⁴² These recommendations are based on a review of the data and consensus.

American Urological Association
The American Urological Association (2017) updated its guidelines on the evaluation and management of clinically localized sporadic renal masses suspicious for renal cell carcinoma.⁴³ The guideline statements on thermal ablation (radiofrequency ablation, cryoablation) are listed in Table 7.

Table 7. Guidelines on Localized Masses Suspicious for Renal Cell Carcinoma

Recommendations	LOR	LOE
Guideline statement 24
Physicians should consider thermal ablation (TA) as an alternate approach for the management of cT1a renal masses < 3 cm in size. For patients who elect TA, a percutaneous technique is preferred over a surgical approach whenever feasible to minimize morbidity.	Conditional	C
Guideline statement 25
Both radiofrequency ablation and cryoablation are options for patients who elect thermal ablation	Conditional	C
Guideline statement 27
Counseling about thermal ablation should include information regarding an increased likelihood of tumor persistence or local recurrence after primary thermal ablation relative to surgical extirpation, which may be addressed with repeat ablation if further intervention is elected	Strong	B

LOE: level of evidence; LOR: level of recommendation.

National Comprehensive Cancer Network
Kidney Cancer
The NCCN ( v.2.2022) guidelines on kidney cancer state that "thermal ablation (cryosurgery, radiofrequency ablation) is an option for the management of patients with clinical stage T1 renal lesions. Thermal ablation is an option for masses < 3 cm, but may also be an option for larger masses in select patients. Ablation in masses > 3 cm is associated with higher rates of local recurrence/persistence and complications. Biopsy of small lesions confirms a diagnosis of malignancy for surveillance, cryosurgery, and radiofrequency ablation strategies. Ablative techniques are associated with a higher local recurrence rate than conventional surgery and may require multiple treatments to achieve the same local oncologic outcomes. The NCCN guidelines also note that "ablative techniques such as cryo- or radiofrequency ablation are alternative strategies for selected patients, particularly the elderly and those with competing health risks." Additionally, the guidelines note that "randomized phase III comparison with surgical resection (i.e., radical or partial nephrectomy by open or laparoscopic techniques) has not been done" and "ablative techniques are associated with a higher local recurrence rate than conventional surgery and may require multiple treatments to achieve the same local oncologic outcomes."⁴⁴

Non-Small Cell Lung Cancer
The NCCN ( v.3.2022) guidelines for NSCLC made the following relevant recommendations:⁴⁵

• Resection is the preferred local treatment modality for medically operable disease.
• Image-guided thermal ablation (IGTA) techniques include radiofrequency ablation, microwave ablation, and cryoablation.
• IGTA may be an option for select patients not receiving stereotactic ablative radiotherapy or definitive radiotherapy.
• IGTA may be considered for those patients who are deemed "high risk," those with tumors that are for the most part surgically resectable but rendered medically inoperable due to comorbidities. In cases where IGTA is considered for high-risk or borderline operable patients, a multidisciplinary evaluation is recommended.
• IGTA is an option for the management of NSCLC lesions < 3 cm. Ablation for NSCLC lesions > 3 cm may be associated with higher rates of local recurrence and complications.
• The guidelines do not separate out recommendations by ablation technique and note that "each energy modality has advantages and disadvantages. Determination of energy modality to be used for ablation should take into consideration the size and location of the target tumor, risk of complication, as well as local expertise and/or operator familiarity."

Cancer Pain
The NCCN Guidelines on Adult Cancer Pain ( v.1.2022) do not address cryoablation specifically for pain due to bone metastases, but note that "ablation techniques may ... be helpful for pain management in patients who receive inadequate relief from pharmacological therapy.⁴⁶

U.S. Preventive Services Task Force Recommendations
Not applicable

Ongoing and Unpublished Clinical Trials
Some currently unpublished trials that might influence this review are listed in Table 8.

Table 8. Summary of Key Trials

NCT No.	Trial Name	Planned Enrollment	Completion Date
Ongoing
Renal cancer
NCT02399124a	ICE­SECRET PROSENSE™ Cryotherapy for Renal Cell Carcinoma Trial	120	Feb 2026

NCT: national clinical trial.
^a Denotes industry-sponsored or cosponsored trial.

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9. Morkos J, Porosnicu Rodriguez KA, Zhou A, et al. Percutaneous Cryoablation for Stage 1 Renal Cell Carcinoma: Outcomes from a 10-year Prospective Study and Comparison with Matched Cohorts from the National Cancer Database. Radiology. Aug 2020; 296(2): 452-459. PMID 32515677
10. Stacul F, Sachs C, Giudici F, et al. Cryoablation of renal tumors: long-term follow-up from a multicenter experience. Abdom Radiol (NY). Sep 2021; 46(9): 4476-4488. PMID 33912986
11. Lee SH, Choi WJ, Sung SW, et al. Endoscopic cryotherapy of lung and bronchial tumors: a systematic review. Korean J Intern Med. Jun 2011; 26(2): 137-44. PMID 21716589
12. Niu L, Xu K, Mu F. Cryosurgery for lung cancer. J Thorac Dis. Aug 2012; 4(4): 408-19. PMID 22934144
13. Callstrom MR, Woodrum DA, Nichols FC, et al. Multicenter Study of Metastatic Lung Tumors Targeted by Interventional Cryoablation Evaluation (SOLSTICE). J Thorac Oncol. Jul 2020; 15(7): 1200-1209. PMID 32151777
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Coding Section

Codes	Number	Description
CPT	19105	Ablation, cryosurgical, of fibroadenoma, including ultrasound guidance, each fibroadenoma
	20983	Ablation therapy for reduction or eradication of 1 or more bone tumors (e.g., metastasis) including adjacent soft tissue when involved by tumor extension, percutaneous, including imaging guidance when performed; cryoablation
	32994	Ablation therapy for reduction or eradication of 1 or more pulmonary tumor(s) including pleura or chest wall when involved by tumor extension, percutaneous, including imaging guidance when performed, unilateral; cryoablation
	50250	Ablation, open, 1 or more renal mass lesion(s), cryosurgical, including intraoperative ultrasound guidance and monitoring, if performed
	50542	Laparoscopy, surgical; ablation of renal mass lesion(s), including intraoperative ultrasound guidance and monitoring, when performed
	50593	Ablation, renal tumor(s), unilateral, percutaneous, cryotherapy
	0581T	Ablation, malignant breast tumor(s), percutaneous, cryotherapy, including imaging guidance when performed, unilateral (eff 01/01/2020)
HCPCS
ICD-10-CM	C25.0-C25.9	Malignant neoplasm of pancreas, code range
	C34.00-C34.92	Malignant neoplasm of bronchus and lung, code range
	C40.0-C41.9	Malignant neoplasm of bone and articular cartilage, code range
	C50.01-C50.929	Malignant neoplasm of breast, code range
	C64.0-C65.9	Malignant neoplasm of kidney and renal pelvis, code range
ICD-10-PCS	0T500ZZ, 0T510ZZ, 0T530ZZ, 0T540ZZ	Destruction, open, kidney or kidney pelvis, code list
	0T503ZZ, 0T513ZZ, 0T533ZZ, 0T543ZZ	Destruction, percutaneous, kidney or kidney pelvis, code list
	0T504ZZ, 0T514ZZ, 0T534ZZ, 0T544ZZ	Destruction, percutaneous endoscopic, kidney or kidney pelvis, code list
	0T507ZZ, 0T517ZZ, 0T537ZZ, 0T547ZZ	Destruction, via natural or artificial opening, kidney or kidney pelvis, code list
	0T508ZZ, 0T518ZZ, 0T538ZZ, 0T548ZZ	Destruction, via natural or artificial opening endoscopic, kidney or kidney pelvis, code list
Type of Service	Surgery
Place of Service	Outpatient/Inpatient

Procedure and diagnosis codes on Medical Policy documents are included only as a general reference tool for each policy. They may not be all-inclusive. 

This medical policy was developed through consideration of peer-reviewed medical literature generally recognized by the relevant medical community, U.S. FDA approval status, nationally accepted standards of medical practice and accepted standards of medical practice in this community, Blue Cross Blue Shield Association technology assessment program (TEC) and other nonaffiliated technology evaluation centers, reference to federal regulations, other plan medical policies, and accredited national guidelines.

"Current Procedural Terminology © American Medical Association. All Rights Reserved" 

History From 2014 Forward     

09/14/2023	Annual review, no change to policy intent. Updating coding
09/01/2022	Annual review, updating description, rationale and references.
09/01/2021	Annual review, updating title, background, rationale and references.
09/01/2020	Annual review, no change to policy intent. Updating rationale, references and coding.
09/01/2019	Annual review, updating guidelines, rationale, references and coding.
09/26/2018	Annual review, adding medical necessity criteria for some lung cancer circumstances. Also updating description, background, rationale and references. Adding guidelines.
09/01/2016	Annual review, no change to policy intent. Updating background, description, rationale and references.
09/16/2015	Annual review, no change to policy intent. Updated background, description, rationale, references and coding.
10/07/2014	Annual review. Updated rationale and references. Added regulatory status and coding section. No change to policy intent.