Introduction / Case Summary: A 62-year-old man with type 2 diabetes mellitus (T2DM), hypertension, and stage 3 chronic kidney disease (CKD) showed progressive decline in estimated glomerular filtration rate (eGFR) and persistent albuminuria despite renin–angiotensin system [RAS] blockade. Baseline values: eGFR 42 mL/min/1.73 m², urinary albumin-to-