Potential genetic predictors of obesity were found on chromosomes 13 (FAM155A), 2 (SOX11), 4 (GLRA3), and 5 (CDH18 and BASP1) among patients exposed to CRT. Most of them were associated with neuronal growth, repair, and connectivity. The gene discussed is CDH18; the disease is obesity due to melanocortin 4 receptor deficiency.