ArticleOncoimmunology2026
HLA-G functions as a tumor-intrinsic driver of growth and survival in renal cell carcinoma.
Article in Oncoimmunology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
HLA-G is a non-classical MHC class I molecule with potent immunoregulatory functions that is aberrantly expressed in multiple malignancies, yet its tumor-intrinsic role remains poorly defined. To characterize this potential oncogenic role of HLA-G in clear cell renal cell carcinoma (ccRCC), we utilized integrated transcriptomic, in vitro, and in vivo approaches. Analysis of the Cancer Genome Atlas (TCGA) ccRCC cohort revealed that elevated HLA-G expression was associated with immunosuppressive programs and cell populations. Interrogation of a publicly available ccRCC single-cell RNA sequencing dataset revealed that HLA-G expression within tumor epithelial clusters is associated with hypoxia-driven, metabolic transcriptional programs. Multiplex immunofluorescence of human ccRCC specimens confirmed the presence of tumor cell-intrinsic HLA-G expression in advanced disease. Functional studies using RCC7 cells expressing the full-length canonical HLA-G isoform (RCC7/HLA-G1) demonstrated increased proliferation, migration, clonogenicity, cell-cycle progression, and resistance to apoptosis compared with HLA-G-negative RCC7wt cells. RCC7/HLA-G1 xenografts exhibited accelerated tumor growth accompanied by the activation of proliferative, stemness-related, and metabolic programs. Multi-omics analyses further revealed enhanced mitochondrial activity and redox metabolic adaptation in HLA-G-expressing tumors. Mechanistically, HLA-G expression was associated with increased VEGF-C expression and enhanced VEGFR3 signaling, suggesting the activation of a VEGF-C/VEGFR3-associated pro-survival pathway. In three-dimensional tumor spheroid immune cell co-culture models, HLA-G expression reduced CD8⁺ T-cell-mediated cytotoxicity while promoting regulatory T-cell expansion and macrophage polarization toward an immunosuppressive M2-like phenotype. Collectively, these findings establish HLA-G as a key contributor to tumor progression and immune suppression in ccRCC and support HLA-G as a promising therapeutic target.
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