FGFR4 and breast cancer: Analyses of expression of 84 key genes involved in adipogenesis and adipocyte functions in the breast and mammary tumor tissues from WT and KO, and from Tg and Tg-KO indicated that the FGFR4 deficiency impacts the adipogenesis and adipocyte functions related to adipokine secretion and lipid metabolism in both breast and breast tumor tissues.