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We report a case of severe type B lactic acidosis (LA) in a 51-year-old male, 12 days after he received his first dose of nivolumab for metastatic Von Hippel Lindau ( VHL) -mutated, clear cell renal cell carcinoma. Throughout his hospital course, infection, hypoperfusion, and tissue necrosis were not identified. We propose that his LA may have resulted from either inherent tumor glycolysis or immune activation and enhanced metabolism. The patient's course was complicated by acute renal failure, and his LA rose progressively, eventually necessitating daily hemodialysis (HD). After receiving five consecutive days of HD, the patient started everolimus daily with the intent of reducing glycolytic metabolism. Subsequently, the rate of lactic acid production slowed, and HD was no longer required after two doses of everolimus. To our knowledge, this is the first reported case of type B LA following nivolumab administration, and the use of everolimus to treat type B LA in a patient with renal cancer.

A Case Report of Severe Type B Lactic Acidosis Following First Dose of Nivolumab in a VHL-Mutated Metastatic Renal Cell Carcinoma