At autopsy (three weeks after inoculation), average weight of the tumours produced by the parental cells was 275 mg ± 105 which was significantly higher than those produced by PC3-M-PPARγ-si-M cells (26.5 mg ± 12.6) (p = 0.002) and PC3-M-PPARγ-si-H cells (4 mg) (p = 0.0003). This evidence concerns the gene PPARG and neoplasm.