Long-term analysis of сanagliflozin budget impact in adult patients with type 2 diabetes mellitus and diabetic nephropathy in the Russian Federation
Background. Diabetic nephropathy (DN) is a specific kidney lesion in patients with diabetes mellitus, which leads to the development of endstage kidney disease and requires substitutive renal therapy (dialysis or transplantation). Canagliflozin is a sodium-glucose co-transporter 2 (SGLT2) inhibitor, which exerts a renoprotective effect. According to the published data, the application of canagliflozin in patients with type 2 diabetes mellitus (DM2) and DN could postpone dialysis therapy for almost 13 years.Objective: to perform a long-term analysis of canagliflozin budget impact in adult patients with DM2 and DN from the point of view of the constituent entities of the Russian Federation.Material and methods. A group of comparison for canagliflozin was placebo (no renoprotective pharmacotherapy). The authors proposed a mathematical model for DN progression in groups of patients who received canagliflozin (100 mg orally, daily, long-term) or placebo. The model was based on the extrapolation of the CREDENCE study data. The model was used for the analysis of the direct costs on the lifetime pharmacotherapy and dialysis per one patient. Epidemiologic data from the federal register on the number of adult patients with DM and DN prevalence among these patients were used to evaluate the size of the target population. Based on the clinical recommendations and the medical care standards for patients with DM and the data on the actual state procurement of SGLT2 inhibitors and glucagon-like peptide-1 receptor agonists in 2021, we evaluated the share of patients with DM2+DN who currently do not receive renoprotective therapy but who must be supplied with canagliflozin according to the standards. Among this population, we determined the patients with the glomerular filtration rate within 30-90 ml/min/1.73 m2, which provides the comparability of the target population with patients included in CREDENCE clinical study.Results. Direct medical costs per one patient receiving canagliflozin therapy were 678 108 rubles, which was 52.8% (759,239 rubles) lower than without renoprotective pharmacotherapy (1,437,347 rubles). As a result, considering the modeling period and current practice, the budget costs for pharmacotherapy of patients with DM2+DN were 99.82 billion rubles, in comparison with the proposed practice, which was 47.09 billion rubles (difference in budget costs is 52.73 billion rubles, or 52.8%). The accumulated costs of the regional health care system were lower in patients receiving canagliflozin in comparison with patients without renoprotective pharmacotherapy 11 years after the beginning of treatment.Conclusion. The expansion of canagliflozin application in the therapy for patients with DM2+DN leads to the budget cost cuts in the long run due to the extension of the dialysis-free period.