The most common ICIs were pembrolizumab (29/44, 66%) and nivolumab (12/44, 27%)....Among pts with LRP1b PVs, 36% (95%CI 14%-64%) had radiographic responses (5/14, 2 lung, 1 prostate, 1 RCC, 1 endometrial carcinoma), two of whom were MSI high....The majority of responders were MSS and TMB low, which may suggest that PV in LRP1B may independently predict for response to ICI.