Merck KGaA, Darmstadt, Germany, and Pfizer Inc. (NYSE: PFE) today announced that the Japanese Ministry of Health, Labour and Welfare (MHLW) has approved BAVENCIO® (avelumab, genetically recombinant Injection 200mg/mL for intravenous use) as the first and only treatment indicated for curatively unresectable Merkel cell carcinoma (MCC), a rare and aggressive cancer, in Japan.