PDCD1 and lymphoma: Most EBV‐driven lymphomas have high levels of programmed cell death protein 1 (PD‐1)/programmed death‐ligand 1 (PD‐L1) expression, typically due to latent membrane protein‐1‐mediated activation of the CD274 JAK/STAT‐dependent promoter or AP‐1‐associated enhancer activity.8