Inter-individual variability in atrasentan exposure partly explains variability in kidney protection and fluid retention responses: A post hoc analysis of the SONAR trial

作者：Koomen, Jeroen, V; Stevens, Jasper; Bakris, George; Correa-Rotter, Ricardo; Hou, Fan Fan; Kitzman, Dalane W.; Kohan, Donald; Makino, Hirofumi; McMurray, John J., V; Parving, Hans-Henrik; Perkovic, Vlado; Tobe, Sheldon W.; de Zeeuw, Dick; Heerspink, Hiddo J. L.^*

来源：DIABETES OBESITY & METABOLISM, 2021, 23(2): 561-568.

DOI：10.1111/dom.14252

• atrasentan
• diabetic kidney disease
• endothelin receptor antagonist
• pharmacodynamics
• randomized controlled trial

Aim To evaluate whether atrasentan plasma exposure explains between-patient variability in urinary albumin-to-creatinine ratio (UACR) response, a surrogate for kidney protection, and B-type natriuretic peptide (BNP) response, a surrogate for fluid expansion. @@@ Methods Type 2 diabetic patients with chronic kidney disease (n = 4775) received 0.75 mg atrasentan for 6 weeks in the active run-in period. Individual area under the concentration-time-curve (AUC) was estimated using a population pharmacokinetic model. The association between atrasentan AUC, other clinical characteristics, and UACR and BNP response, was estimated using linear regression. @@@ Results The median atrasentan AUC was 43.8 ng.h/mL with a large variation among patients (2.5th-97.5th percentiles [P]: 12.6 to 197.5 ng.h/mL). Median UACR change at the end of enrichment was -36.0% and median BNP change was 8.7%, which also varied among patients (UACR, 2.5th-97.5th P: -76.2% to 44.5%; BNP, 2.5th-97.5th P: -71.5% to 300.0%). In the multivariable analysis, higher atrasentan AUC was associated with greater UACR reduction (4.88% per doubling in ng.h/mL [95% confidence interval {CI}: 6.21% to 3.52%], P < .01) and greater BNP increase (3.08% per doubling in ng.h/mL [95% CI: 1.12% to 4.11%], P < .01) independent of estimated glomerular filtration rate, haemoglobin or BNP. Caucasian patients compared with black patients had greater UACR reduction (7.06% [95% CI: 1.38% to 13.07%]) and also greater BNP increase (8.75% [95% CI: 1.65% to 15.35%]). UACR response was not associated with BNP response (r = 0.06). @@@ Conclusion Atrasentan plasma exposure varied among individual patients and partially explained between-patient variability in efficacy and safety response.

• 单位
  1; Southern Medical University