ProKidney presents results from Phase 2 REGEN-007 trial of rilparencel

ProKidney (PROK) presented full results from the Phase 2 REGEN-007 trial evaluating rilparencel in patients with advanced CKD and diabetes. The data, featured in a late-breaking clinical trials presentation at the American Society of Nephrology Kidney Week 2025, further demonstrate the potential of rilparencel to preserve kidney function in patients with advanced CKD and diabetes who are at high risk of kidney failure and have limited therapeutic options. The full Phase 2 trial results presented at ASN Kidney Week 2025 add to the body of clinical data for rilparencel that support the ongoing registrational Phase 3 PROACT 1 study. A first-of-its-kind, proprietary, autologous cell therapy, rilparencel has the potential to be a novel treatment for advanced CKD and diabetes, offering patients an alternative therapeutic option to delay or prevent the need for dialysis. REGEN-007 was a multi-center Phase 2 open-label 1:1 randomized two-arm trial in patients with advanced CKD and diabetes. Eligible participants were assigned to one of two treatment groups using different dosing regimens. Group 1 replicated the dosing schedule of the ongoing Phase 3 PROACT 1 study in which patients receive two scheduled rilparencel injections, approximately three months apart. Group 2 tested an exploratory dosing regimen to investigate whether disease progression triggers, rather than a time-based trigger, could optimize multiple doses of rilparencel. Group 2 received one injection and a second only if a re-dosing trigger was met within 15 months after the first injection. Participants were followed up to 18 months after their last injection. Overall, 87 rilparencel injections in 49 participants were performed during the study. The primary efficacy endpoint was change in eGFR slope from the pre-injection period to the period after the last injection analyzed using a linear mixed model. The primary safety endpoint was the percentage of participants with procedure- and investigational product-related treatment-emergent adverse events. Among the full results from the study, key efficacy and safety findings include: In Group 1, bilateral kidney injection with rilparencel resulted in a 4.6 mL/min/1.73m2 improvement in the annual decline in eGFR slope; this 78% improvement was statistically significant and clinically meaningful. Among Group 1 patients, 15 of 24 met key Phase 3 PROACT 1 inclusion criteria; in this subgroup, bilateral kidney injection resulted in a 5.5 mL/min/1.73m2 improvement in the annual decline in eGFR slope; this 85% improvement was statistically significant and clinically meaningful. Group 2 tested an exploratory dosing regimen that resulted in 10 of 25 patients receiving only one rilparencel injection; following treatment with rilparencel, the annual decline in eGFR slope improved by 1.7 mL/min/1.73m2, or 50%; this improvement was not statistically significant but suggests evidence of a dose response Post-hoc analysis of patient subgroups on standard-of-care medications, including sodium-glucose cotransporter-2 inhibitors and glucagon-like peptide-1 receptor agonists, suggest rilparencel had a treatment effect incremental to that observed with SOC Rilparencel was well tolerated and had an acceptable safety profile.