Use of Common Genetic Variants (single nucleotide polymorphisms) to Predict Risk of Non-Familial Breast Cancer - CAM 325
Single nucleotide polymorphisms (SNPs) refer to single-base pair changes that achieve a population frequency of at least 1 percent. They represent the most abundant form of genetic variation and are responsible for much of the heritable phenotypic variation observed in human populations.
A search of the FDA device database for “breast cancer” on June 7, 2019, yielded no results related to SNP-related tests to predict breast cancer risk. The FDA on 03/06/2019 approved direct-to-consumer testing for three SNPs of BRCA1/2 by the company 23andMe (FDA, 2018). Additionally, many labs have developed specific tests that they must validate and perform in house. These laboratory-developed tests (LDTs) are regulated by the Centers for Medicare and Medicaid (CMS) as high-complexity tests under the Clinical Laboratory Improvement Amendments of 1988 (CLIA ’88). As an LDT, the U. S. Food and Drug Administration has not approved or cleared this test; however, FDA clearance or approval is not currently required for clinical use.
- Testing for one or more single nucleotide polymorphisms (SNPs) is investigational and/or unproven and therefore is NOT MEDICALLY NESSARY for all indications, including, but not limited to, use as a method of estimating individual patient risk for developing breast cancer. These include, but are not limited, to the OncoArray, TruSight®, and BREVAGenplus,™ breast cancer tests and tests offered directly to consumers.
Following skin cancer, breast cancer is tied with lung cancer as the most frequently diagnosed cancer across the globe and is the overall leading cause of cancer death in women. In the United States, following skin cancer, breast cancer is the second most diagnosed cancer and, following lung cancer, is the second most common cause of cancer death in women. Approximately 1 in 8 women will develop breast cancer in their lifetime.
Breast cancer risk is strongly associated with both genetic and environmental factors. Familial aggregation and twin studies have shown that inherited susceptibility plays a substantial role in the risk of developing breast cancer. Many genetic loci are known to contribute to this risk. These loci fall into three categories: genes with high-penetrance mutations (notably BRCA1 and BRCA2), moderate-risk alleles in genes such as ATM, CHEK2 and PALB2, and common lower penetrance alleles, of which almost 80 have been identified, principally through genome-wide association studies (GWAS). GWAS continues to identify additional risk loci, with 65 loci identified by Michailidou et al. (2017). Coupled with established risk factors, these loci are likely to increase the utility and accuracy of clinical risk prediction.
For sporadic (nonfamilial) breast cancer, the Breast Cancer Risk Assessment Tool (BCRAT), most often referred to as the Gail model is commonly used to produce individual risk estimates in women. The model incorporates individual risk factors including age, family history (breast cancer among first-degree relatives), personal reproductive history (age at menarche and at first live birth), and personal medical history (number of previous breast biopsies and presence of biopsy-confirmed atypical hyperplasia) to identify women who have an increased 5-year risk and lifetime risk of invasive breast cancer and who may benefit from risk reduction with selective estrogen receptor (ER) modulators. While this model has implications for primary prevention of invasive breast cancer, both the discriminatory accuracy of the Gail model and its calibration in certain populations have been challenged. In 2018, Wang et al. (2018) systematically reviewed and analyzed the performance of different versions of the Gail model. They did find that the original Gail model 1 and the Caucasian-American Gail model was well calibrated in American and European women. However, in contrast, the Caucasian-American and Asian-American Gail models likely overestimate the risk in Asian females, providing a risk roughly double that of their actual risk.
Previous studies have analyzed the potential impact of adding genetic information from a panel of single nucleotide polymorphisms (SNPs) associated with breast cancer risk to the Gail model. SNPs are specific locations in the genome where a nucleotide differs between individuals. A study that compared classification of risk using the Gail model or the Gail model plus 10 common genetic susceptibility variants, excluding those associated with BRCA1 or BRCA2, found that inclusion of these genetic factors only modestly improved performance of the BCRAT. Another study evaluated the inclusion of a SNP risk score combined with the Gail model, basing the SNP risk score on seven SNPs associated with risk for breast cancer. The combined risk model modestly improved risk prediction performance compared to the Gail model alone, with the greatest impact seen in women at intermediate risk. These showed that real gains, albeit modest, could be achieved in reclassification of risk. Other studies have found modest potential clinical gains from combining SNP information with clinical risk factors. However, these studies have either been theoretical in nature or they combined model building with evaluation, which may complicate evaluating the results in a clinical context. Incorporating genetic information has the greatest improvement in risk assessment in subsets of women that are at an intermediate risk based on their clinical risk factors.
Numerous proprietary tests exist for the assessment of SNPs in breast cancer risk. TruSight evaluates 94 genes and 284 SNPs related to common and rare cancers, including breast cancer; BREVAGenplus, now GeneType for Breast Cancer, measures 66 genes and 77 loci for Caucasian women, 74 for African American women, and 71 for Hispanic women; Inifinium OncoArray-500k covers over 500000 SNPs associated with many types of cancer, as well as other features such as ancestry and pharmacogenetics. Additionally, companies, such as 23andMe, can offer direct-to-consumer SNP testing for risk of breast cancer. The amount of possible assessments and combinations of SNPs are virtually infinite.
Clinical Validity and Utility
Recently, a 76-locus polygenic risk score (PRS) was incorporated into the Breast Cancer Surveillance Consortium (BCSC) risk-prediction model to assess its attributable risk, comparing five-year absolute risk predictions between models within three studies (1,643 case patients, 2,397 control patients). The PRS was found to be an independent risk factor across all three studies and improved discriminatory accuracy for area under the curve (AUC) from AUC = 0.66 to AUC = 0.69. The study concluded that the set of 76 SNPs improves the identification of women at the highest risk. Along with the increase seen in AUC, there was a net-reclassification of 11% of case patients (95% CI = 7% to 15%) to a risk level where women are more likely to benefit from chemoprevention. This suggests that SNPs could be clinically useful. However, independent cohort data are needed to test calibration in the general population.
Michailidou et al. (2017) performed a GWAS on breast cancer, encompassing “122,977 cases and 105,974 controls of European ancestry and 14,068 cases and 13,104 controls of East Asian ancestry.” Overall, they identified 65 new loci associated at a genome-wide level with overall breast cancer risk (defined as P < 5 × 10-8). The authors concluded that “these results provide further insight into genetic susceptibility to breast cancer and will improve the use of genetic risk scores for individualized screening and prevention”.
Cuzick et al. (2017) developed a SNP risk score (SNP88) using the Illumina OncoArray, which includes most known breast-cancer risk SNPs (previously validated and directly available or with close surrogates on the OncoArray) in women receiving preventative treatment. They found that “SNP88 was predictive of breast cancer risk overall (interquartile range odds ratio (IQ-OR), 1.37), but mainly for estrogen receptor-positive disease (IQ-OR, 1.44) versus estrogen receptor-negative disease. However, the observed risk of SNP88 was only 46% of expected. No significant interaction was observed with treatment arm. SNP88 was independent of TC (Spearman rank-order correlation, 0.012) and when combined multiplicatively, a “substantial” improvement was seen (IQ-OR, 1.64)”.
Mavaddat et al. (2015) evaluated the value of using 77 breast cancer related SNPs for risk stratification. A total of 33,673 breast cancer cases and 33,381 controls were analyzed. All possible pair-wise multiplicative interactions were examined and a 77-SNP polygenic risk score (PRS) was created for estrogen receptor (ER) status, as well as breast cancer overall. The authors found that women in the highest 1% of the PRS had a “three-fold increased risk” compared to women in the middle quintile (odds ratio = 3.36). Lifetime risk of breast cancer for women without a family history that had a PRS in the lowest and highest quintiles were 5.2% and 16.6%, respectively.
Rudolph et al. (2018) investigated the integration of PRS into risk prediction models, combining PRS and environmental risk factors. The authors performed a retrospective review of 20 studies and evaluated joint associations of the 77-SNP PRS with several environmental factors such as body mass index (BMI) and alcohol use. They found that “the strongest evidence for a non-multiplicative joint association with the 77-SNP PRS was for alcohol consumption, adult height, and current use of combined menopausal hormone therapy in ER-positive disease. Risk associations for these factors by percentiles of PRS did not follow a clear dose-response. In addition, global and tail-based goodness of fit tests showed little evidence for departures from a multiplicative risk model, with alcohol consumption showing the strongest evidence for ER-positive disease (P = 0.013 for global and 0.18 for tail-based tests) (Rudolph et al., 2018).” They concluded that “the combined effects of the 77-SNP PRS and environmental risk factors for breast cancer are generally well described by a multiplicative model”.
Schuetz et al. (2019) researched genetic variants and the relationship between inflammation, apoptosis, and autophagy in breast cancer risk. In total, 206 SNPs were tested in 54 genes related to inflammation, apoptosis, and autophagy in a population-based breast cancer study; this study included women of both European descent (658 with breast cancer and 795 controls) and East Asian descent (262 with breast cancer and 127 controls). The researchers report that “although no SNP was associated with breast cancer risk among women of European descent, we found evidence for an association among East Asians for rs1800925 (IL-13) and breast cancer risk (OR = 2.08; 95% CI: 1.32-3.28; p = 0.000779), which remained statistically significant after multiple testing correction” (Schuetz et al., 2019). The researchers also report that “This association was replicated in a meta-analysis of 4305 cases and 4194 controls in the Shanghai Breast Cancer Genetics Study”.
Kapoor et al. (2020) assessed potential interactions between 205 breast cancer susceptibility loci and 13 established breast cancer risk factors. A total of 28,176 cases and 32,209 controls were analyzed with the iCOGS array (a custom SNP genotyping array), and 44,109 cases and 48,145 controls were genotyped using the OncoArray. An interaction with less than or equal to 1% prior probability was found with three different SNP risk factor pairs. “SNP rs4442975 was associated with a greater reduction of risk of ER-positive breast cancer… in current users of estrogen-progesterone therapy compared with non-users. This finding was supported by replication using OncoArray data of the previously reported interaction between rs13387042 (r2 = 0.93 with rs4442975) and current estrogen-progesterone therapy for overall disease (Pint = 0.004). The two other interactions suggested stronger associations between SNP rs6596100 and ER-negative breast cancer with increasing parity and younger age at first birth”.
Shu et al. (2020) performed a meta- analysis of data from GWAS conducted in Asians (24,206 cases, 24,775 controls) and European descendants (122,977 cases, 105,974). The focus of their study was identifying additional genetic susceptibility loci for breast cancer, as currently known risk variants only explain a small portion of breast cancer heritability, particularly in Asian women. In this study, they identified 31 potential novel risk loci, with the lead variant showing an associate with breast cancer risk at p<5x10-8. Of note, “the associations for 10 of these loci were replicated in an independent sample of 16,787 cases and 16,680 controls of Asian women (P < 0.05). In addition, we replicated the associations for 78 of the 166 known risk variants at P < 0.05 in Asians. These findings improve our understanding of breast cancer genetics and etiology and extend previous findings from studies of European descendants to Asian women”.
Zhang et al. (2020) note that “breast cancer susceptibility variants frequently show heterogeneity in associations by tumor subtype... defined by combinations of ER, (progesterone receptor) PR, (human epidermal growth factor 2) HER2 and grade: (1) luminal A-like, (2) luminal B/HER2-negative-like, (3) luminal B-like, (4) HER2-enriched-like and (5) triple-negative or basal-like” To identify novel breast cancer loci, they performed a GWAS (133,384 breast cancer cases, 113,789 controls, plus 18,908 BRCA1 mutation carriers, 9,414 of them with breast cancer) on patients with European ancestry. They identified 32 novel susceptibility loci (p<5x10-8), 15 of which showed associations with at least one tumor feature. Five loci showed opposite associations (p<0.05) between luminal- and non-luminal subtypes. They also found that “the genetic correlations between five intrinsic-like subtypes ranged from 0.35 to 0.80. The proportion of genome-wide chip heritability explained by all known susceptibility loci was 37.6% for triple-negative and 54.2% for luminal A-like disease. The odds ratios of polygenic risk scores (PRSs), which included 330 variants, for the highest 1% quantiles compared to middle quantiles were 5.63 and 3.02 for luminal A-like and triple-negative disease, respectively. These findings provide an improved understanding of genetic predisposition to breast cancer subtypes and will inform the development of subtype-specific polygenic risk scores”.
Adedokun et al. (2021) used a cross-ancestry GWAS approach to describe breast cancer risk loci. They identified breast cancer variants in individuals from African ancestry GWAS (9,421 cases, 10,193 controls) and meta-analyzed them with European ancestry GWAS data (122,977 cases, 105,974 controls). The identified “four loci for overall breast cancer risk [1p13.3, 5q31.1, 15q24 (two independent signals), and 15q26.3] and two loci for estrogen receptor-negative disease (1q41 and 7q11.23) at genome-wide significance.” This study suggests that replication across multiple ancestry populations will “help improve the understanding of breast cancer genetics and identify causal variants”.3
American Society of Clinical Oncology (ASCO)
An update from the ASCO included recommendations for genetic and genomic testing for cancer susceptibility. These guidelines state, “ASCO recognizes that concurrent multigene testing (i.e. panel testing) may be efficient in circumstances that require evaluation of multiple high-penetrance genes of established clinical utility as possible explanations for a patient’s personal or family history of cancer. Depending on the specific genes included on the panel employed, panel testing may also identify mutations in genes associated with moderate or low cancer risks and mutations in high-penetrance genes that would not have been evaluated based on the presented personal or family history. Multigene panel testing will also identify variants of uncertain significance (VUSs) in a substantial proportion of patient cases, simply as a result of the multiplicity of genes tested. ASCO affirms that it is sufficient for cancer risk assessment to evaluate genes of established clinical utility that are suggested by the patient’s personal and/or family history.”
National Comprehensive Cancer Network (NCCN)
Prior to 2020, the NCCN guidelines focused largely on testing BRCA1/2. However, in 2020, the NCCN updated their guidelines (NCCN, 2020), as “there is now strong evidence that genes beyond BRCA1/2 confer markedly increased risk of breast and/or ovarian cancers;…” The NCCN Guideline for Genetic/Familial High-Risk Assessment: Breast, Ovarian, and Pancreatic version 1.2022 states: “Multi-gene testing may be most useful when more than one gene can explain an inherited cancer syndrome. In these cases, phenotype-directed testing based on personal and family history through a multi-gene panel test may be more efficient and/or cost-effective. Multi-gene testing may also be considered for those who tested negative for one particulate syndrome, but whose personal and family history is suggestive of an inherited susceptibility.” They also state “multi-gene tests also increase the likelihood of detecting a VUS. However, as multi-gene testing is increasingly used, the frequency of a variant being interpreted as a VUS is expected to decrease.” They recommend that “for individuals potentially meeting established criteria for one or more of the hereditary cancer syndromes, genetic testing should be considered along with appropriate pre- and post-test counseling” (category 2A).
The NCCN Panel recommends “multi-gene testing may be considered for individuals who meet these criteria [Testing Criteria for High-Penetrance Breast and Ovarian Susceptibility Genes] and who previously underwent single-gene and/or absent deletion duplication analysis but tested negative. Both first- and second-degree relatives of individuals who meet these testing criteria are also eligible for testing, except for second-degree relatives of individuals with pancreatic cancer or prostate cancer, for whom prior probability of a high-penetrance cancer susceptibility gene is low in the absence of additional family history of cancer; only first-degree relatives of these affected individuals should be offered testing, unless indicated for other relatives based on additional family history.” The guidelines also note that “carriers of a pathogenic or likely pathogenic variant should be encouraged to participate in clinical trials or genetic registries. Carriers should be encouraged to recontact their genetics providers every few years for updates, as laboratories may issue amended reports as the knowledge base surrounding hereditary cancer risk expands” (category 2A).
The NCCN also states “a major dilemma regarding multi-gene testing is that there are limited data and a lack of clear guidelines regarding degree of cancer risk associated with some of the genes assessed, and how to communicate and manage risk for carriers of these genes. This issue is compounded by the low incidence rates of hereditary disease, leading to a difficulty in conducting adequately powered studies. Multi-gene tests often include low to moderate-penetrance genes, for which there are little available data regarding degree of cancer risk and guidelines for risk management. Also, certain variants in a gene may be associated with a different degree of risk than other variants in that gene. For example, the presence of certain ATM genetic variants is associated with an increased risk for early-onset breast cancer and frequent bilateral occurrence, but the association between other ATM variants and breast cancer susceptibility is less clear”.
Finally, the NCCN also notes that “commercial entities providing ancestry (and sometimes health) information typically do so through microarray-based single nucleotide polymorphism (SNP) testing that has not been validated for clinical use. Third-party software applications can be used by consumers to obtain an interpretation of the raw data provided by these companies. Raw data and third-party software are not able to provide information that is appropriate for medical management, as these services are not subject to quality-control processes and recent research suggests that the error rate is substantial”.
The United States Preventive Services Task Force (USPSTF)
The USPSTF published recommendations related to genetic testing for breast cancer. In particular, “The USPSTF found adequate evidence that the benefits of risk assessment, genetic counseling, and genetic testing are moderate in women whose family history is associated with an increased risk for harmful mutations in the BRCA1/2 genes,” whereas for women without such family history, it stated that the benefits are small to none. They concluded with moderate certainty that the net benefit of these procedures outweighs the harms in women both with or without a familial risk of potentially harmful mutations.
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|CPT||81599||Unlisted multianalyte assay with algorithmic analysis|
|ICD-10-CM (effective 10/01/15)|
|Z13.71-Z13.79||Encounter for screening for genetic and chromosomal anomalies code range,|
|Z80.3||Family history of malignant neoplasm of breast|
|ICD-10-PCS (effective 10/01/15)||Not applicable. ICD-10-PCS codes are only used for inpatient services. There are no ICD procedure codes for laboratory tests.|
|Type of Service|
|Place of Service|
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 and Blue Shield Association technology assessment program (TEC) and other non-affiliated 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
Annual review, no change to policy intent. Updating background, rationale and references
Annual review, no change to policy intent. Updating coding.
Annual review, no change to policy intent. Adding OncoArray and TruSight to the investigational statement.
Annual review, no change to policy intent.
Updated category to Laboratory. No other changes.
Annual review, no change to policy intent.
Annual review, no change to policy intent. Updated background, description, guidelines, rationale and references. Added coding.
Annual review. Updated policy verbiage to include: The OncoVue® and BREVAGen™ breast cancer risk tests are considered investigational for all indications, including but not limited to use as a method of estimating individual patient risk for developing breast cancer. Updated title, background, description, regulatory status, rationale and references. Added related policy, policy guidelines and ICD 9&10 codes. Policy merged with 20457 which will be archived when this policy is approved.