Glucose-6-phosphate dehydrogenase correlates with tumor immune activity and programmed death ligand-1 expression in Merkel cell carcinoma ========================================================================================================================================= * Motoki Nakamura * Kotaro Nagase * Maki Yoshimitsu * Tetsuya Magara * Yuka Nojiri * Hiroshi Kato * Tadahiro Kobayashi * Yukiko Teramoto * Masahito Yasuda * Hidefumi Wada * Toshiyuki Ozawa * Yukie Umemori * Dai Ogata * Akimichi Morita