H2BC12 is a histone H2B variant with pleiotropic roles across immune and cancer-related pathways. While UniProt annotations suggest antibacterial activity and contribution to mucosal immune barriers, the provided PubMed abstracts do not directly support these functions. Instead, H2BC12 emerges as a prognostic biomarker in multiple malignancies: it is included in senescence-associated secretory phenotype (SASP)-related prognostic signatures for acute myeloid leukemia 1, where elevated expression associates with shorter overall survival in high-risk patients. In lung adenocarcinoma, H2BC12 is identified as an aging-related gene (ARG) with elevated expression in tumors correlating with poorer survival and immune evasion 2. Conversely, in intervertebral disc degeneration, H2BC12 shows negative correlation with disease risk, suggesting protective effects 3. At the molecular level, H2BC12 appears involved in epigenetic regulation: in breast cancer cells, it forms part of a key protein axis (with SUPT16H and SETD2) associated with cannabidiol-mediated restoration of epithelial phenotype, pointing to chr6 remodeling roles 4. In adipocytes, H2BC12 is uniquely upregulated in extracellular vesicles, implicating roles in metabolic regulation 5. These findings suggest H2BC12 functions context-dependently as both a cancer progression marker and epigenetic regulator.