PDCD1LG2 and small cell lung carcinoma: Median OS, defined as the time from initial SCLC diagnosis to death, was 17.2 months (95% CI, 9.3−22.6 months) in patients with PD-L2–positive disease and 7.5 months (95% CI, 2.3−11.3 months) in patients with PD-L2–negative disease.