Studies Have Shown That 5%-10% of All Breast Cancers Are

Multiple Choice

Studies have shown that 5%-10% of all breast cancers are related to mutations in BRCA1 and BRCA2. A logical conclusion from these data is that:

A) most women with breast cancer have mutations in one or both of these genes.
B) most women with breast cancer must have inherited the gene from their mother.
C) at least some breast cancers are caused by the environment or by genes other than BRCA1 and BRCA2.
D) not all mutations in BRCA1 and BRCA2 have been identified to account for the other 90%-95% of breast cancers.