NCIt definition : A vaccine formulation consisting of recombinant vaccinia virus encoding prostate specific
antigen (PSA) and recombinant vaccinia virus encoding three co-stimulatory molecule
transgenes B7.1, ICAM-1, and LFA-3 (TRICOM). Vaccination with PSA in combination with
TRICOM may enhance antigen presentation, resulting in the augmentation of a cytotoxic
T cell (CTL) immune response against tumor cells expressing PSA.;