FDA Accepts Biogen Tofersen NDA for Rare ALS

Share

FDA has accepted and granted priority review to a Biogen NDA for tofersen, an investigational new drug intended to treat superoxide dismutase 1 amyotrophic lateral sclerosis. The agency set a PDUFA action date of 1/25/23 for the NDA. Biogen says it was informed that FDA plans to schedule an advisory committee meeting to consider the application.

The company says it is seeking accelerated approval for tofersen based on the use of neurofilament as a surrogate biomarker that is reasonably likely to predict clinical benefit. “Neurofilaments are normal proteins found in healthy neurons, that are increased in blood and cerebrospinal fluid when damage has been done to neurons or their axons and are a marker of neurodegeneration,” it says. “In ALS, higher levels of neurofilaments have been found to predict more rapid decline in clinical function and shortened survival. Tofersen study results suggest reductions in neurofilament preceded and predicted slowing of decline in measures of clinical and respiratory function, strength, and quality of life.”

Recent 12-month results showed that individuals with SOD1-ALS who started tofersen earlier experienced a slower rate of decline in clinical and respiratory function, strength and quality of life, Biogen says. It noted that the VALOR Phase 3 study did not meet the primary endpoint of change from baseline to week 28 in the Revised Amyotrophic Lateral Sclerosis Functional Rating Scale. “However, trends of reduced disease progression across multiple secondary and exploratory endpoints were observed, it says. The 12-month integrated data showed that earlier initiation of tofersen led to sustained reductions in neurofilament, and slowed decline across multiple efficacy endpoints.

Read more