Rate of BRCA mutation in patients tested under NCCN genetic testing criteria

Chinese American and Non-Hispanic White Breast Cancer Patients' Knowledge and Use of BRCA Testing

Breast cancer is the most commonly diagnosed cancer among Chinese American women. Knowing the BRCA1 and BRCA2 (BRCA1/2) gene mutation status can improve breast cancer patients' health outcomes by guiding targeted treatment towards preventing breast cancer recurrence and other BRCA-related cancers. Nevertheless, it is unclear if there is a disparity in knowledge and use of BRCA testing among Chinese American breast cancer patients. This cross-sectional study investigated the possible presence of differences in the knowledge and the use of BRCA testing between Chinese American and Non-Hispanic White (NHW) breast cancer patients. We surveyed 45 Chinese American and 48 NHW adult breast cancer patients who had been diagnosed with breast cancer within the previous two years through telephone interviews. The results showed that race was not statistically related to the use of BRCA testing. BRCA testing utilization was associated with family history (p < 0.05) and age (p < 0.05). However, Chinese American participants' understanding of BRCA testing was significantly lower than that of NHW participants (p = 0.030). Our findings suggest that a disparity exists in BRCA testing knowledge between Chinese American and NHW breast cancer patients. Genetic education and counseling are needed to improve BRCA testing knowledge and uptake among Chinese American breast cancer patients.

Double Heterozygous Mutations in the BRCA2 and ATM Genes: A Case Report and Review of the Literature

Introduction

Germline mutations of the BRCA1 and BRCA2 genes are responsible for about a quarter of hereditary breast cancers (BCs). In this study, we aimed to determine the importance of rare double heterozygous (DH) pathogenic variant carriership in BRCA2and ATM genes in a patient diagnosed with BC and pancreas cancer (PC).

Case Report

A 54-year-old female patient was diagnosed with BC at the age of 34 years and with PC at the age of 48 years. The multigene panel and next-generation sequencing technique were used to evaluate the status of the patient's cancer susceptibility genes. Pathogenic variants c.537dup (p.Ile180Tyrfs*3) in the BRCA2 gene and c.5065C>T (p.Gln1689Ter) in the ATM gene were detected as DH in the patient. Co-segregation analysis was performed on the relatives of the patient using Sanger sequencing.

Discussion/Conclusion

Multiple primary malignant neoplasms can be encountered more frequently in DH pathogenic variant carriers, and the diagnosis of malignancies can be made at an earlier age through surveillance guided by genetic testing. In this rare case, more patient studies are needed to determine the contribution of DH in BRCA2 and ATM genes to the phenotype.

Genetic epidemiology of BRCA1- and BRCA2-associated cancer across Latin America

The prevalence and contribution of BRCA1/2 (BRCA) pathogenic variants (PVs) to the cancer burden in Latin America are not well understood. This study aims to address this disparity. BRCA analyses were performed on prospectively enrolled Latin American Clinical Cancer Genomics Community Research Network participants via a combination of methods: a Hispanic Mutation Panel (HISPANEL) on MassARRAY; semiconductor sequencing; and copy number variant (CNV) detection. BRCA PV probability was calculated using BRCAPRO. Among 1,627 participants (95.2% with cancer), we detected 236 (14.5%) BRCA PVs; 160 BRCA1 (31% CNVs); 76 BRCA2 PV frequency varied by country: 26% Brazil, 9% Colombia, 13% Peru, and 17% Mexico. Recurrent PVs (seen ≥3 times), some region-specific, represented 42.8% (101/236) of PVs. There was no ClinVar entry for 14% (17/125) of unique PVs, and 57% (111/196) of unique VUS. The area under the ROC curve for BRCAPRO was 0.76. In summary, we implemented a low-cost BRCA testing strategy and documented a significant burden of non-ClinVar reported BRCA PVs among Latin Americans. There are recurrent, population-specific PVs and CNVs, and we note that the BRCAPRO mutation probability model performs adequately. This study helps address the gap in our understanding of BRCA-associated cancer in Latin America.

Optimization of prediction methods for risk assessment of pathogenic germline variants in the Japanese population

Predicting pathogenic germline variants (PGVs) in breast cancer patients is important for selecting optimal therapeutics and implementing risk reduction strategies. However, PGV risk factors and the performance of prediction methods in the Japanese population remain unclear. We investigated clinicopathological risk factors using the Tyrer‐Cuzick (TC) breast cancer risk evaluation tool to predict BRCA PGVs in unselected Japanese breast cancer patients (n = 1,995). Eleven breast cancer susceptibility genes were analyzed using target‐capture sequencing in a previous study; the PGV prevalence in BRCA1, BRCA2, and PALB2 was 0.75%, 3.1%, and 0.45%, respectively. Significant associations were found between the presence of BRCA PGVs and early disease onset, number of familial cancer cases (up to third‐degree relatives), triple‐negative breast cancer patients under the age of 60, and ovarian cancer history (all P < .0001). In total, 816 patients (40.9%) satisfied the National Comprehensive Cancer Network (NCCN) guidelines for recommending multigene testing. The sensitivity and specificity of the NCCN criteria for discriminating PGV carriers from noncarriers were 71.3% and 60.7%, respectively. The TC model showed good discrimination for predicting BRCA PGVs (area under the curve, 0.75; 95% confidence interval, 0.69‐0.81). Furthermore, use of the TC model with an optimized cutoff of TC score ≥0.16% in addition to the NCCN guidelines improved the predictive efficiency for high‐risk groups (sensitivity, 77.2%; specificity, 54.8%; about 11 genes). Given the influence of ethnic differences on prediction, we consider that further studies are warranted to elucidate the role of environmental and genetic factors for realizing precise prediction.

Development and Pilot Implementation of the Genomic Risk Assessment for Cancer Implementation and Sustainment (GRACIAS) Intervention in Mexico

PURPOSE

Genomic cancer risk assessment (GCRA) is standard-of-care practice that uses genomic tools to identify individuals with increased cancer risk, enabling screening for early detection and cancer prevention interventions. GCRA is not available in most of Mexico, where breast cancer (BC) is the leading cause of cancer death and ovarian cancer has a high mortality rate.

METHODS

Guided by an implementation science framework, we piloted the Genomic Risk Assessment for Cancer Implementation and Sustainment (GRACIAS) intervention, combining GCRA training, practice support, and low-cost BRCA1/2 (BRCA) gene testing at four centers in Mexico. The RE-AIM model was adapted to evaluate GRACIAS intervention outcomes, including reach, the proportion of new patients meeting adapted National Comprehensive Cancer Network criteria who participated in GCRA. Barriers to GCRA were identified through roundtable sessions and semistructured interviews.

RESULTS

Eleven clinicians were trained across four sites. Mean pre-post knowledge score increased from 60% to 67.2% (range 53%-86%). GCRA self-efficacy scores increased by 31% (95% CI, 6.47 to 55.54; P = .02). Participant feedback recommended Spanish content to improve learning. GRACIAS promoted reach at all sites: 77% in Universidad de Guadalajara, 86% in Instituto Nacional de Cancerología, 90% in Tecnológico de Monterrey, and 77% in Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán. Overall, a pathogenic BRCA variant was identified in 15.6% (195 of 1,253) of patients. All trainees continue to provide GCRA and address barriers to care.

CONCLUSION

We describe the first project to use implementation science methods to develop and deliver an innovative multicomponent implementation intervention, combining low-cost BRCA testing, comprehensive GCRA training, and practice support in Mexico. Scale-up of the GRACIAS intervention will promote risk-appropriate care, cancer prevention, and reduction in related mortality.

The Relationship of Mutation Carriage of BRCA1/2 and Family History in Triple-Negative Breast Cancer: Experience from a Diagnostic Center in Turkey

Objective

BRCA1/2 genes play a role in the etiopathogenesis of 10%-30% of triple-negative breast cancer (TNBC). This study aims to investigate the BRCA1/2 genes and the demographic and clinicopathological features in patients with TNBC. The study also examined the impact of cancer history of TNBC individuals' relatives on the risk of BRCA1/2 mutation carriership rate.

Materials and Methods

The BRCA1/2 genes of 65 women diagnosed with TNBC between 2011 and 2017 were investigated using next-generation sequencing. We analyzed the correlations of patients' demographic and clinicopathologic parameters and family history with BRCA1/2 mutation status. We used the χ²-test, t-test, Mann-Whitney U test, and logistic regression statistical methods.

Results

The BRCA1/2 mutation carrier rate was 16.9%. Patients who had BRCA1/2 mutations were compared with those who did not in terms of demographic and clinicopathological parameters. In the BRCA1/2 mutation carrier group, the Ki-67 index and the number of relatives with cancer were higher than the BRCA1/2 non-carrier group. Logistic regression analysis revealed that when the number of relatives with breast or ovarian cancer was ≥2, the risk of carrying the BRCA1/2 mutation increased by 15-fold. Regardless of the type of cancer (including cancers in other organs besides breast or ovary), the risk of carrying the BRCA1/2 mutation increased 1.3 times with each increase in the number of relatives with cancer for the patient with TNBC.

Conclusion

In cases with a diagnosis of TNBC, a significant relationship exists between the number of relatives with cancer in the family history and the risk of carrying mutations in the BRCA1/2 genes. This relationship can be confirmed further by large-scale studies with more cases.

Early-onset breast cancer in a woman with a germline mobile element insertion resulting in BRCA2 disruption: a case report

Mobile element insertions (MEIs) contribute to genomic diversity, but they can be responsible for human disease in some cases. Initial clinical testing (BRCA1, BRCA2 and PALB2) in a 40-year-old female with unilateral breast cancer did not detect any pathogenic variants. Subsequent reanalysis for MEIs detected a novel likely pathogenic insertion of the retrotransposon element (RE) c.7894_7895insSVA in BRCA2. This case highlights the importance of bioinformatic pipeline optimization for the detection of MEIs in genes associated with hereditary cancer, as early detection can significantly impact clinical management.

Executive Summary of the Early-Onset Breast Cancer Evidence Review Conference

The Centers for Disease Control and Prevention launched the Bring Your Brave campaign to increase knowledge about early-onset breast cancer, defined as breast cancer in women aged 18-45 years. The American College of Obstetricians and Gynecologists convened a panel of experts in breast disease from the Society for Academic Specialists in General Obstetrics and Gynecology to review relevant literature, validated tools, best practices, and practice guidelines as a first step toward developing educational materials for women's health care providers about early-onset breast cancer. Panel members conducted structured literature reviews, which were then reviewed by other panel members and discussed at an in-person meeting of stakeholder professional and patient advocacy organizations in April 2019. This article summarizes the relevant literature, existing guidance, and validated tools to guide health care providers in the prevention, early detection, and special considerations of early-onset breast cancer. Substantive knowledge gaps were noted and summarized to provide guidance for future research.