This study has revealed the differences in occurrence of the alleles andgenotypes of the TGFB1 gene: the rs1800471 polymorphism in heart transplantrecipients and healthy individuals, the rs1800469 polymorphism in patients withDCM and IHD, and the rs1800470 polymorphism in patients with and withoutmyocardial fibrosis in a cardiac allograft. The gene discussed is TGFB1; the disease is myocardial ischemia.