Autosomal Dominant Tubulointerstitial Kidney Disease Clinical Trial Simulator: Case Reports of Model-Informed Drug Development.

). Both slope-based eGFR change and end-of-trial eGFR measures functioned as effective surrogate endpoints. Herein, we present the model-based CTS tool developed for ADTKD and demonstrate its use in designing and evaluating clinical trial scenarios, illustrated by two representative case studies. The CTS tool provides a pragmatic framework for optimizing ADTKD trial design. By enabling scenario testing and highlighting genotype-specific considerations, it supports efficient, cost-effective planning and represents an example of model-informed drug development in rare kidney diseases.