CD274 and head and neck squamous cell carcinoma: The general trend for a higher ORR in PD‐L1 positive (TC ≥ 25% and TC ≥ 1%) patients with ESCC and HNSCC is consistent with published reports regardless of tumor type; however, any potential trends should be interpreted with caution due to the limited sample size in the PD‐L1 evaluable population.