Episode 160: Understanding Genetics and the Cancer Risk, with Leigha Senter The James Cancer-Free World Podcast

Knowing your family’s medical history is important and can save lives. “When we think of family history in terms of cancer genetics [and inherited genetic mutations], we think about a broad spectrum of relatives, more than just your parents and siblings,” said Leigha Senter, MS, CGC, a James licensed genetic counselor. “We ask about grandparents and aunts and uncles and cousins and that can inform us about how likely you have a hereditary predisposition for cancer.” Ohio State and the James have one of the largest and most advanced genetic counseling programs in the country. “We have 12 genetic counselors on the faculty supporting the cancer program and we have genetic counselors who specialize in specific types of cancer,” Senter said. In this episode, Senter discusses the two most common types of inherited genetic mutations that increase the cancer risk: the Breast Cancer gene (BRCA1 and BRCA2) that increases the risk of breast cancer as well as ovarian, pancreas and prostate cancer; and Lynch Syndrome, which increases the risk of colorectal cancer as well as uterine cancer. “The average woman has a 12 percent chance over the course of their lifetime of developing breast cancer,” Senter said. “Those with [BRCA1 and BRCA2] have anywhere from a 50 to 80 percent chance.” Uncovering inherited genetic mutations leads to earlier and more frequent screenings that can detect cancer in its earliest and most treatable stages. In the case of patients with Lynch Syndrome, earlier and more frequent colonoscopies “can actually prevent a cancer from happening,” Senter said. Cascade testing is one of Senter’s specialties. “Someone in every family is always the first to test positive for an inherited genetic mutation,” she said. “The next step is to help them share this information with as many family members as possible. This is cascade testing and is where are real potential to help people is.”