CD274 and histiocytic sarcoma: The other 7 types of tumors, namely squamous cell carcinoma, diffuse large B-cell lymphoma, nasal adenocarcinoma, soft tissue sarcoma, histiocytic sarcoma, transitional cell carcinoma, and anal sac gland carcinoma did not express PD-L1, although the tested sample size was substantially limited (5 cases for each tumor type).