Treatment-naive pts with aBTC received toripalimab (240mg, iv, Q3W), combined with GS (gemcitabine...Pts with TP53 or ATM alterations had a shorter PFS than wild-type pts (6 months vs. 10.5 months, p=0.036, and 2.8 months vs. 8.2 months, p=0.00037, respectively).