PDCD1 and neoplasm: It is known that PD‐L1 expressed on tumor cells leads to T‐cell impairment through a PD‐1/PD‐L1 interaction (Dong et al., 2002; Francisco et al., 2010; Iwai et al., 2002) Hence, we tested the impact of drug‐treated stromal cells on T‐cell viability and function.