{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,10,27]],"date-time":"2026-10-27T01:10:39Z","timestamp":1793063439508,"version":"4.5.0"},"posted":{"date-parts":[[2026,7,4]]},"group-title":"Immunology","reference-count":57,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2026,7,4]],"date-time":"2026-07-04T00:00:00Z","timestamp":1783123200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"name":"National Institute of Health, National Cancer Institute","award":["R37CA292807"],"award-info":[{"award-number":["R37CA292807"]}]},{"name":"National Institute of Health, National Cancer Institute","award":["5P30CA045508"],"award-info":[{"award-number":["5P30CA045508"]}]},{"name":"G. Harold & Leila Y. 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Using orthotopic mouse models spanning distinct genetic and immunologic contexts, we show that a Helicobacter-containing microbiome suppresses primary tumor growth and limits metastasis. This protective state is associated with increased intratumoral lymphocyte infiltration and stronger effector programs. Mechanistically, microbial exposure induces MHC class II expression in colon cancer cells to promote anti-tumor immunity. Tumor-intrinsic loss of CIITA abrogates microbial protection, whereas enforced CIITA expression is sufficient to increase intratumoral T cell accumulation, restrict progression and metastasis, and sensitize microsatellite-stable tumors to PD-1 and CTLA-4 blockade. In human microsatellite-stable patient-derived organoids, increased cancer-cell MHC-II enhanced interactions with autologous immune cells and increased tumor cell apoptosis. Together, these findings define a microbiome-cancer cell antigen presentation axis that restrains metastasis and overcomes immunotherapy resistance in colorectal cancer.<\/jats:p>","DOI":"10.64898\/2026.06.30.735621","type":"posted-content","created":{"date-parts":[[2026,7,5]],"date-time":"2026-07-05T05:25:11Z","timestamp":1783229111000},"source":"Crossref","is-referenced-by-count":1,"title":["Microbial induction of MHC-II expression in colon cancer cells overcomes immunotherapy resistance and limits metastasis"],"prefix":"10.64898","author":[{"given":"Charlie","family":"Chung","sequence":"first","affiliation":[{"name":"Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, USA"},{"name":"Stony Brook University, Graduate Program in Genetics, Stony Brook, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elif","family":"Ozcelik","sequence":"additional","affiliation":[{"name":"Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, 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