The BRCA Gene Is Related to Breast Cancer;

The BRCA gene is related to breast cancer;

A) women with this gene are about 20 times as likely to develop breast cancer as women without this gene.
B) women with a mutated form of this gene are vulnerable to breast cancer.
C) this gene is responsible for about 50% of breast cancer cases.
D) women with this gene will develop breast cancer, and 40% of them will do so before age 35.