Fig. 2

Survival curves of patients after salvage surgery according to the types of prior drug therapy. a OS. b PFS. The 2-year OS rates are 67%, 100%, and 50% in the cytotoxic agent, TKI, and ICI groups, respectively. The 2-year PFS rates are 25%, 17%, and not assessable in the cytotoxic agent, TKI, and ICI groups, respectively. There are significant differences in OS between the TKI and cytotoxic agent groups (p = 0.04) and the TKI and ICI groups (p = 0.02). There is no significant difference in PFS among the three groups (p = 1.0). ICI, immune checkpoint inhibitor; NA, not available; OS, overall survival; PFS, progression-free survival; TKI, tyrosine kinase inhibitor