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Life sciences · Journal article
Science Advances · October 14, 2026
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Immune checkpoint therapies have shown limited efficacy in metastatic castration-resistant prostate cancer (mCRPC). The AMADEUS prostate expansion cohort (NCT03651271) evaluated the efficacy, safety, and biomarkers of escalating ipilimumab doses combined with nivolumab. Patients received ipilimumab 1 milligram per kilogram (mg/kg) + nivolumab 360 mg (I1+N360), ipilimumab 3 mg/kg + nivolumab 1 mg/kg (I3+N1), or ipilimumab 5 mg/kg + nivolumab 1 mg/kg (I5+N1). Coprimary endpoints were 6-month disease control rate (DCR) and changes in tumoral CD8 percentage. Thirty-two patients were enrolled. DCRs were 33% (4 of 12) for I1+N360, 20% (1 of 5) for I3+N1, and 20% (3 of 15) for I5+N1. Across cohorts, tumoral CD8 percentage increased by a median of 5.0%. Although higher ipilimumab doses were tolerable, I1+N360 achieved similar disease control and immune activation with a more favorable safety profile. Early disease progression was associated with increased expression of a TREM2-associated myeloid gene signature, which was also significantly enriched in two independent prostate cancer datasets.