Impact of proton pump inhibitors on immunotherapy is modulated by prior chemotherapy and linked to gut microbiome-immune cell signatures. - Petouhoff A; Hicks R; Husain M; Hoyd R; Xu M; Dravillas C; Patel SH; Johns A; Grogan M; Li M; Lopez G; Miah A; et al. (Cancer immunology, immunotherapy : CII, 2026)