The present study included a total of 96 patients with long-lasting type 1 diabetes mellitus (DM1) and early (0-5) stages of chronic renal disease (CRD). Replacement renal therapy (RRT) consisted of programmed hemodialysis (PHD) and kidney transplantation (KT). Routine clinical examination was supplemented by the assessment of phosphorous and calcium metabolism indices, measurement of cardiac pathology markers, and studies of coronary artery calcification with the use of multispiral computed tomography (MSCT) of the heart with the calculation of the Agatston score index. It was shown that the impairment of the renal function was accompanied by a rise in the phosphorus, parathormone, and FGF-23 levels, increased vitamin D deficiency (with a slight deviation of its levels from the reference values in the patients at high risk of cardiovascular events treated with PHD). In the patients who had undergone KT and showed fairly good function of the renal transplant, the above parameters were similar to those of the patients with stage 0-4 CRD which suggested their normalization in case of adequate RRT during DM1. The progress of cardiovascular pathology with the deterioration of the renal function was manifested as an increase of NT-proBNP levels in parallel to the duration of CRD (r=0.304; p<0.05), decrease of the glomerular filtration rate (p=-0.540; p<0.05), and their significant correlation with the main characteristics of mineral homeostasis. The degree of coronary artery calcification was related to the patients' age, duration of DM1, and severity of arterial hypertension. The high Agatston score index and pronounced left ventricular hypertrophy in the patients following KT are supposed to reflect the irreversible character of certain cardiovascular lesions persisting despite optimal RRT and positive dynamics of phosphorus and calcium metabolism and NT-proBNP levels. It is concluded that the development and progression of renal dysfunction are associated with the disturbances of mineral and bone metabolism that promote further progress of cardiovascular pathology that is the main cause of mortality among this cohort of patients.