PDCD1LG2 and breast cancer: Of note, strong positive correlations were observed between MET and PD-L1 in lung adenocarcinoma and bladder cancer (r = 0.401, p < 0.001 and r = 0.385, p < 0.001, respectively) and between MET and PD-L2 in breast cancer and bladder cancer (r = 0.383, p < 0.001 and r = 0.355, p < 0.001, respectively).