CD274 and lung cancer: Particularly, miR34a, miR200b, miR197, miR513, miR570, and miR138‐5p19, 20, 21, 22, 23, 24 may be potential surrogate biomarkers for PD‐L1 expression, although we focused on miR200b because our preliminary data indicated that only miR200b is negatively correlated with PD‐L1 expression in NSCLC cell lines and clinical specimens from lung cancer patients (data not shown).