1897PDDifferential expression of immune checkpoints (PD-L1, HHLA2, B7x and B7H3) and their association with driver mutations in pulmonary sarcomatoid carcinoma (PSC). (23rd October 2018) - Cheng, H; Sharma, J; Su, C; Li, S; Zang, X; Perez-Soler, R; Halmos, B; Borczuk, A