CD274 and diffuse large B-cell lymphoma: Collectively, our findings provide novel insights into the enzymes involved in Trp metabolism in DLBCL and NK/TCL and their association with PD‐L1 expression, which offers potential strategies to combine Trp‐metabolism enzyme inhibitors with anti‐PD‐L1 or other immunotherapeutic strategies in clinical DLBCL or NK/TCL treatment.