PPARG and neoplasm: WhilePPARα activation is clearly carcinogenic in rodents [9, 32, 33],the rodent PPARγ data are controversial, and it appears that rodent PPARγactivation may have oncogenic as well as tumour suppressor activity, likelydepending amongst others on cellular and physiological contexts [5, 6, 8, 9, 34, 36].Further, potential interactions between rodent PPARα and PPARγ in coexpressingcells have, to our knowledge, essentially not been examined at all.