In animal models, cc49scFv-FasLext cured Jurkat-Ras (Jurkat cells transfected with human Ras oncogene) tumors implanted in SCID mice owing to increased sensitivity to the recombinant protein depending on TAG-72 and Fas expression as well as high-sensitivity of the tumor to cc49scFv-FasLext. This evidence concerns the gene FAS and neoplasm.