Cost-utility analysis of empagliflozin on chronic kidney disease progression in Thailand.

Abstract

Objective: The prevalence of chronic kidney disease (CKD) in Thailand is high and kidney disease progression remains a problem. Empagliflozin has been known to be used to slow CKD progression, but its accessibility remains limited. This study aimed to assess the cost-utility of empagliflozin for CKD progression in Thailand.

Methods: A state-transition model was developed consisting of eight health states: five eGFR health states (G2, G3a, G3b, G4, and G5), dialysis, kidney transplantation, and death. Empagliflozin 10 mg was assessed as an add-on treatment to standard of care (SoC). The efficacy of empagliflozin was derived from the EMPA-KIDNEY trial, while other inputs were obtained from a comprehensive literature review. The incremental cost-effectiveness ratio (ICER) per quality-adjusted life year (QALY) was calculated. A probabilistic sensitivity analysis (PSA) was performed to explore uncertainties.

Results: Empagliflozin could improve QALYs by 0.62 and 0.71 for patients with CKD without and with diabetes mellitus (DM) compared with SoC, respectively. However, it required higher total lifetime costs of 77,966 Thai baht (THB) and 59,454 THB for patients with CKD without and with DM, respectively. The ICER for CKD without DM was 126,201 THB/QALY, while the ICER for CKD with DM was 83,473 THB/QALY. The PSA indicated that empagliflozin had a 64.00% probability of being cost-effective for CKD without DM and an 89.18% probability for CKD with DM.

Limitations: An important limitation was that the treatment effects of empagliflozin were derived from the EMPA-KIDNEY, which was conducted in DM patients and assumed to be the same for non-DM patients because of the limited evidence in non-DM patients.

Conclusion: At the current willingness-to-pay threshold of 160,000 THB/QALY, empagliflozin was cost-effective for treating patients with CKD without or with DM.