FFAR4 and obesity due to melanocortin 4 receptor deficiency: To assess the effects of expression levels of obesity-related genes on cancer survival rate, the expression levels of the 13 obesity-related genes (LEPR, POMC, MC4R, TMEM18, KCTD15, GNPDA2, SH2B1, MTCH2, NEGR1, FTO, LEP, PCSK1, and GPR120) were compared between normal tissues and cancer tissues.