Jan's sister and mother have both had breast cancer. She is wondering if she should undergo genetic testing to check for a mutation of the BRCA1 gene. A mutation in the BRCA1 gene is commonly associated with, but not guaranteed to cause, breast cancer. The presence of a mutation increases a patient's chances of getting breast cancer to about 85 percent, compared to a 13 percent risk in the general population. Costs may vary, but most labs charge patients or their insurance companies less than $3,000 to sequence the BRCA1 to look for mutations. Do you think that Jan should undergo genetic sequencing? Explain your answer.