... 2007,13(23):699 3-7 002.19. Takao M, Okamoto A, Nikaido T, Urashima M, Takakura S, Saito M,Saito M, Okamoto S, Takikawa O, Sasaki H, Yasuda M, Ochiai K, Tan-aka T: Increased synthesis of indoleamine-2,3-dioxygenaseprotein ... E, Shibata K, Kajiyama H, Yoshida N, Terauchi M,Nawa A, Nagasaka T, Takikawa O, Kikkawa F: Inverse correlationbetween tumoral indoleamine 2,3-dioxygenase expressionand tumor-infiltrating lymphocytes ... secondary to the degradation of the essential amino acid, L-tryptophan [30]. Additionally, the role of IDO in the antitumor activity of human IFN-γremains controversial [3 1-3 3]. Therefore, more attentionshould...