In this fifth episode of OncChats: Examining the Promise of Multicancer Early Detection Tests, Toufic A. Kachaamy, MD, Madappa Kundranda, MD, PhD, and Niloy Jewel J. Samadder, MD, walk through the key lessons learned from the prospective, multicenter PATHINDER study (NCT04241796), which evaluated a multicancer early detection test developed by GRAIL.