The dose-dependency of RET/PTC and PAX8/PPARγ, which is the fusion occurring in the follicular thyroid carcinoma, between PAX8, a transcription factor involved in the thyroid development and PPARγ, the master transcriptional regulator of adipogenesis [74,75], was also determined in radiation-related Chernobyl cases but the decline in the rearrangement frequency at higher doses was modelled and the confidence interval was very wide [76]. This evidence concerns the gene RET and thyroid gland follicular carcinoma.