Although two breast cancer genes are known,most cases are nonhereditary.

Name: Although two breast cancer genes are known,most cases are nonhereditary.
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While two breast cancer genes (BRCA1 and BRCA2) have been identified as hereditary factors that increase the risk of developing breast cancer, the majority of breast cancer cases are nonhereditary and are believed to result from a complex interplay of environmental and lifestyle factors.

Although Two Breast Cancer Genes Are Known,most Cases Are Nonhereditary