Paternal family history ignored while assessing breast cancer
STUDY SUGGESTS that father's family history of breast cancer and ovarian cancer is generally overlooked by both patients and doctors.
Genetic counselor Jeanna McCuaig and her co-authors from Toronto's Princess Margaret Hospital in Toronto and Montreal wrote in commentary in the journal "The Lancet Oncology", healthcare providers may be "unaware that these women might have inherited the mutated gene from their father and might not routinely collect this information from their patients."
Women don't recognize a paternal family history of cancer as a risk factor for the diseases, and are unlikely to volunteer the information unless directly questioned.
Women and men both have 50 percent risk of passing on mutations in the BRCA1 or BRCA2 tumour suppressor genes, which increase lifetime risk for breast cancer and ovarian cancer.
A study, led by researchers at Memorial Sloan-Kettering Cancer Center, has suggested that genetic variants on chromosomes 10 and 20 may modify risk of breast cancer among women with a BRCA2 mutation. Researchers analysed DNA samples from 6,272 women with BRCA2 mutations in a two-stage genome-wide association study.
The chromosome-10 variant identified in the study, near the gene ZNF365, decreased the risk of breast cancer by approximately 25 percent in women also carrying a mutation of the BRCA2 gene.
Researchers suggested that healthcare providers should be familiar with general trends in genetic cancers, including:
-Diagnosis at younger ages than sporadic cancers.
-Several family members over generations might be diagnosed with cancer, particularly rare forms or breast cancer and ovarian cancer.
-Diagnosis with many primary type of cancers.
According to a study, about 20 to 30 per cent of the more than 6,90,000 women diagnosed with breast cancer and nearly 1,90,000 diagnosed with ovarian cancer in developed countries have had a family history of cancer.
The BRCA1 and BRCA2 mutations are linked to aggressive hereditary breast cancers, but only account for about 15 percent of all cases.
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