Roche Advancing Parkinson’s Drug Into Phase 3

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Roche says it is moving its Parkinson’s drug prasinezumab into a Phase 3 trial after two mid‑stage trials and their open‑label extensions hinted at a disease‑slowing effect in early‑stage disease. Prasinezumab, a monoclonal antibody, is designed to target aggregated alpha-synuclein. A 2022 Phase 2 study failed when its primary outcome did not differ significantly between either the active-treatment group or placebo. 

The decision to advance the drug’s development also comes despite it being revealed last year that the drug’s research was called into question because of falsified research publication allegations involving one of NIH’s then-top officials, neuroscientist Eliezer Masliah. The journal Science said Masliah’s work helped gain a research nod from FDA for clinical trials of prasinezumab, which is intended to attack alpha-synuclein, whose build-up in the brain has been linked to the condition’s debilitating physical and cognitive symptoms.

An investigation by Science raised issues with research conducted and published over the past two decades by Masliah. As Science was unveiling its findings from a two-year probe, NIH simultaneously released a statement saying that following its investigation, it had “made findings of research misconduct” against Masliah for “falsification and/or fabrication involving re-use and relabel of figure panels” in two publications.

In announcing the decision to advance the drug, Roche says the “totality of data suggest that prasinezumab may have the potential to become the first disease‑modifying treatment for people with Parkinson’s disease.” The company says trial data show that time to confirmed motor progression improved for patients taking prasinezumab, but it was not statistically significant. Regarding the drug’s durability, the company says two‑year follow‑up data suggest a 30‑40 % relative reduction in motor progression versus placebo, an effect that appears to persist in ongoing open‑label extensions involving more than 750 participants.

Jefferies analysts put the probability of Phase 3 success at just 25‑40 %, noting the antibody acts outside neurons and questioning whether that is sufficient to halt intracellular α‑synuclein spread, according to biospace.com.

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