男性における免疫回避を促進するYap1-Cd276/B7-H3軸： medulloblastomaにおける性差の解明

Molecular mechanisms underlying sex-specific differences in cancer incidence and therapy responses are under intense investigation. Here, we report sex-biased functions of Yap1 in multiple cancer types in human and mouse. Through integrated multi-omics analyses, we demonstrate that Yap1 deletion significantly extends survival in male but not female Sonic Hedgehog (SHH) medulloblastomas (MB) models. While Yap1 is required to maintain stem-like cells in both sexes, Yap1 plays a more critical role in immune evasion in males. Mechanistically, YAP1 is essential for activating Cd276/B7-H3 expression to mediate CD8⁺ T cell suppression in males. Consistently, CD276 inhibition extends survival in male but not female SHH MB. Moreover, in vivo targets of YAP1 stratify survival in male but not female patients with medulloblastoma, glioblastoma, mesothelioma, and lung cancer. This study provides evidence for sex-biased functions of Yap1 and CD276 in MB immune suppression and highlights the importance of biological sex in cancer:immune interactions.