STAT3 and neoplasm: When tested in DR5‐treated tumor cell‐jurkat cell co‐culture reporter assays, inhibition of various posttranslational PD‐L1 stability regulators (Hsu et al, 2018) such as mTOR, STAT3, CDK1, and NF‐kβ did not change PD‐L1 surface expression (Fig 2D).