Organon ELENA trial misses primary endpoint, to discontinue OG-6219 program

Organon (OGN) announced that the Phase 2 ELENA proof-of-concept study evaluating the investigational candidate OG-6219 in endometriosis-related pain did not meet its primary efficacy endpoint. OG-6219 is an oral 17beta-hydroxysteroid dehydrogenase type 1 inhibitor, which Organon acquired through its acquisition of Forendo Pharma in 2021. In the study, OG-6219 did not demonstrate improvement in moderate-to-severe endometriosis-related overall pelvic pain compared to placebo. Based on these results, the company plans to discontinue the OG-6219 clinical development program. The randomized, double-blind, placebo-controlled, parallel-group, global multi-center Phase 2a/b study aimed to evaluate the efficacy, safety, and tolerability of three dose levels of OG-6219 in pre-menopausal women 18 to 49 years of age who have been surgically diagnosed with endometriosis with moderate-to-severe endometriosis-related pain. Eligible patients were randomized to receive one of three doses of OG-6219 or placebo orally twice a day. The primary efficacy endpoint was the change from the baseline cycle to the last planned treatment cycle, in the mean endometriosis-related overall pelvic pain score.