PDCD1 and cancer: SATB1 has been shown to be dysregulated in human T‐cell lymphoma.8, 9 Given its role in regulating PD‐1,22 a T‐cell exhaustion marker,13 SATB1 could be an attractive molecule to understand PD‐1 regulation in current cancer immunotherapeutic approaches which aim to reverse T‐cell exhaustion by PD‐1 blockade.