Letter to the editor, Reply to: Lee and Matulonis: Immunotherapy and radiation combinatorial trials in gynecologic cancer: A potential synergy?

•CALLA (NCT03830866) is a randomized, international, double-blind, placebo-controlled study.•Immunotherapy-naïve patients with adenocarcinoma or cervical carcinoma are being enrolled.•CALLA is one of the largest trials in this patient population.