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Proteins created from recurrent fusion genes like CBFB-MYH11 are prevalent in acute myeloid leukemia (AML), often necessary for leukemogenesis, persistent throughout the disease course, and highly leukemia specific, making them attractive neoantigen targets for immunotherapy. A nonameric peptide derived from a prevalent CBFB-MYH11 fusion protein was found to be immunogenic in HLA-B*4001+ donors. High-avidity CD8+ T cell clones isolated from healthy donors killed CBFB-MYH11+ HLA-B*4001+ AML cell lines and primary human AML samples in vitro. CBFB-MYH11-specif

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81, 95% confidence interval [CI] 1.27-2.57, p less then .001). The same effect was observed among antibiotic-exposed patients with stage III disease (HR 2.78, 95% CI 1.31-5.87, p=.007). When limited to only patients who received adjuvant ICI (N = 89), antibiotic-exposed patients also had statistically significantly worse OS (HR 4.84, 95% CI 1.09-21.50, p=.04). The antibiotic group had a greater incidence of colitis (HR 2.14, 95% CI 1.02-4.52, p=.046). CONCLUSION Patients with stage III and IV melanoma exposed to antibiotics prior to ICI