NCIt definition : A vaccine consisting of recombinant vaccinia virus, based on the modified vaccinia
virus Ankara (MVA) that encodes the melanoma-associated antigen tyrosinase. Vaccination
with vaccinia-tyrosinase may stimulate the host immune system to mount a cytotoxic
T-cell response against tumor cells expressing tyrosinase. Tyrosinase is a melanoma-specific
differentiation agent that catalyzes the synthesis of the melanin precursor L-3,4-dihydroxyphenylalanine
(L-DOPA).;