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FibroGen: Topline Results from LELANTOS-2 Phase 3 Study

September 5, 2023

FibroGen recently announced topline data from the Phase 3 LELANTOS-2 trial of pamrevlumab for the treatment of ambulatory patients with Duchenne muscular dystrophy (DMD) on background systemic corticosteroids. Unfortunately, the study did not meet the primary endpoint of change in the North Star Ambulatory Assessment (NSAA) total score from baseline to week 52 (placebo-corrected mean difference -0.528 points; 95% CI -2.308 to 1.251; p=0.5553). Secondary endpoints measured by change from baseline at week 52 in 4-stair climb velocity, 10-meter walk/run test, time to stand, time to loss of ambulation, and proportion of patients with greater than 10 seconds in the 10-meter walk/run test were also not met.

“We are deeply disappointed that the LELANTOS-2 study did not meet its primary endpoint. We are grateful for the courageous efforts of patients, their caregivers, the advocacy community, and the trial investigators who have contributed to this important clinical study. We are committed to sharing all learnings from this trial with the Duchenne community and hope that there are insights that may help future efforts to develop treatments for this devastating disease.”

Thane Wettig, Interim Chief Executive Officer

Preliminary safety data showed that pamrevlumab was generally safe and well tolerated. The majority of treatment-emergent adverse events were mild or moderate.

FibroGen is in the process of evaluating the totality of the data, including other pre-specified endpoints, to determine the next steps for the program. The Company plans to communicate the full results of the LELANTOS-2 study at an upcoming medical forum. Defeat Duchenne Canada will share these results as soon as they become available.