PDCD1LG2 and neoplasm: In the post-treatment setting there was a strong negative correlation between the percentage of OAC tumour cells expressing PD-L2 (r=−0.83), Lag-3 (r=−0.70) and A2aR (r=−0.72) with treatment response, clinical T stage and serosal invasion, respectively (p = 0.002, 0.03 and 0.02, respectively) (Table 1).