The inhibitory effects of the hybrid liposomes on the growth of B-16 melanoma cells in vitro and in vivo were examined. The 50% inhibitory concentration of the hybrid liposomes composed of 90 mol% dimyristoylphosphatidylcholine (DMPC) and 10 mol% polyoxyethylenedodecyl ether (C12(EO)10) was one-twelfth of that of DMPC liposomes. It was noteworthy that for the first time significantly prolonged survival was obtained using a mouce model of carcinoma after the administration of the hybrid liposomes of 90 mol% DMPC/10 mol% C12(EO)n (n=10 or 23) without antitumor drugs.
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