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The correlations of survival during ICIs monotherapy and pre-ICI chemotherapy regimens. (A) PFS following ICIs monotherapy of the total patient; (B) PFS following ICIs monotherapy based on different pre-ICI chemotherapeutic regimens; (C) OS following ICIs monotherapy of the total patient; (D) OS following ICIs monotherapy based on different pre-ICI chemotherapeutic regimens. PFS, progression-free survival; OS, overall survival; Gem, gemcitabine; Pem, pemetrexed; Tax, taxane.
