Antitumor properties of modified recombinant human lymphotoxin (rLT) i
n murine models of fibrosarcoma MC-11 and melanoma B-16 were studied.
Maximal antitumor effect was observed after intratumoral and intraperi
toneal injections of rLT for 5 (fibrosarcoma MC-11) and 7 (melanoma B-
16) days at the doses of 10(3) and 10(4) U/mice, respectively. Specifi
c immunoglobulin G to pure rLT was found to neutralize completely the
cytotoxicity in vitro and the antitumor activity of rLT in vivo. The p
reparation showed an activity against well established tumors and had
no effect on immature tumors.