Fan, Xiaolu. “Combining PD-1 PD-L1 and CTLA-4 Inhibitors for the Treatment of Colorectal Cancer: A Systematic Review and Meta-Analysis”. Highlights in Science, Engineering and Technology 102 (July 11, 2024): 597–605. Accessed August 11, 2026. https://drpress.org/ojs/index.php/HSET/article/view/22052.