Moreover, in the same study it was demonstrated that the weak antitumor effect of IL‐2 in Meth A fibrosarcoma bearing mice was enhanced by concomitant administration of 34 (10 mg/kg, 5 or 3 times per week) and IL‐2 (5 × 106 U/kg, 5 or 3 times per week) following 2 weeks of treatment. This evidence concerns the gene IL2 and fibrosarcoma.