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Autoimmune phenomena during immunotherapy are associated with favorable outcomes in patients with metastatic renal cell carcinoma. We have reported improved survival in patients with stage IV renal cell carcinoma who carry autoimmunity associated HLA class II haplotypes. We propose that the clinical benefit is mediated by products of other autoimmunity associated genes linked to these haplotypes. A candidate gene is complement C4, which replicates as part of the RCCX module, can be present in multiple copies and exists as C4A and C4B isoforms. Deficiencies of either isoform are associated with autoimmunity. In the current study we tested the hypothesis that C4A or C4B deficiency predicts improved survival of patients with RCC.

Genetic Deficiency of Complement Isoforms C4A or C4B Predicts Improved Survival of Metastatic Renal Cell Carcinoma