GlaxoSmithKline’s experimental drug GSK095 is designed to work in tandem with checkpoint inhibiting medicines in the hopes of empowering the immune system to launch a more aggressive attack against tumors than it does with checkpoint inhibitors alone. Early results from a preclinical trial of a related GSK drug suggest that the combo holds promise in treating pancreatic cancer—so much so that the company is launching a phase 1 study of the drug in combination with Merck’s blockbuster PD1 checkpoint inhibitor Keytruda.