Like breast cancer, most cases of ovarian cancer are sporadic with no family history of the cancer; but, 5-10% of cases are understood to be due to a hereditary predisposition. The population risk of ovarian cancer is 1 in 71 (SEER).
The EGL Breast and Ovarian Cancer Panel includes genes involved in hereditary cancer predisposition syndromes that have an increased risk for breast and/or ovarian cancer. They include hereditary breast and ovarian cancer syndrome (BRCA1 and BRCA2), hereditary diffuse gastric cancer syndrome (CDH1), Li-Fraumeni syndrome (TP53), Cowden syndrome (PTEN), Peutz-Jeghers syndrome (STK11), ataxia telangiectasia (ATM), Lynch syndrome (MLH1, MSH2, MSH6, PMS2, and EPCAM), and MUTYH-associated polyposis syndrome (MUTYH).
It is estimated that 20-25% of familial breast cancer risk can be ascribed to mutations in the BRCA1 or BRCA2 genes (van der Groep 2011). The contribution of mutations in the CDH1, PTEN, STK11, and TP53 genes to familial breast cancer risk is considerably lower than the contribution of BRCA1 and BRCA2 mutations.
Reports have shown that the lifetime risk to develop ovarian cancer is between 24-54% for BRCA1 mutation carriers and 11-27% for BRCA2 mutation carriers. Women with BRCA1 or BRCA2 mutations have a ~41-84% lifetime risk to develop breast cancer and an up to 50% risk for contralateral breast cancer. Additionally, other cancers associated with mutations in BRCA1 and BRCA2 in women include fallopian tube carcinoma, and uterine serous carcinoma. The lifetime risk for breast cancer in males with a known or expected to be pathogenic variant carriers is estimated to be 4% for BRCA1 and 7% for BRCA2 mutation.
Women with Lynch syndrome have an ~13% lifetime risk of developing ovarian cancer.
- Chen S and Parmigiani G. Meta-anlaysis of BRCA1 and BRCA2 penetrance. J Clin Oncol. 2007 Apr;25(11):1329-33.
- Risch HA et al. Population BRCA1 and BRCA2 mutation frequencies and cancer penetrances: a kin-cohort study in Ontario. J Natl Cncer Inst. 2006 Dec;98(23):1694-706.
- King MC et al. Breast and ovarian cancer risks due to inherited mutations in BRCA1 and BRCA2. Science. 2003 Oct;302(5645):643-6.
- Leide A et al. Cancer Risks for Male Carriers of Germline Mutations in BRCA1 or BRCA2: A Review of the Literature. J Clin Oncol. 2004 Feb 15;22(4):735-42.
- South et al. Consideration of Hereditary Nonpolyposis Colorectal Cancer in BRCA Mutation-Negative Familial Ovarian Cancers. Cancer. 2009 115:324-333.
Individuals with a clinical or suspected diagnosis of breast or ovarian cancers.
Deletion/Duplication Analysis: DNA isolated from peripheral blood is hybridized to a gene-targeted CGH array to detect deletions and duplications. The targeted CGH array has overlapping probes that cover the entire genomic region. Please note that PMS2 and SMARCA4 are not included in the deletion/duplication analysis.
Please note that a "backbone" of probes across the entire genome are included on the array for analytical and quality control purposes. Rarely, off-target copy number variants causative of disease may be identified that may or may not be related to the patient's phenotype. Only known pathogenic off-target copy number variants will be reported. Off-target copy number variants of unknown clinical significance will not be reported.
Analytical Sensitivity: ~99%.
Deletion/Duplication Analysis: Detection is limited to duplications and deletions. The CGH array will not detect point or intronic mutations. Results of molecular analysis must be interpreted in the context of the patient's clinical and/or biochemical phenotype.
Submit only 1 of the following specimen types
Type: Whole Blood
Specimen Requirements:In EDTA (purple top) tube:
Infants (<2 years): 2-3 ml
Children (>2 years): 3-5 ml
Older Children & Adults: 5-10 ml
Specimen Collection and Shipping: Ship sample at room temperature with overnight delivery.
Type: Isolated DNA
Specimen Requirements:In microtainer: 60 ug
Isolation using the QiagenTM Puregene kit for DNA extraction is recommended.
Specimen Collection and Shipping: Refrigerate until time of shipment in 100 ng/ul of TE buffer. Ship sample at room temperature with overnight delivery.
- Hereditary Cancer Syndrome: Sequencing Panel