Sufferers dosed with an experimental Skye Bioscience weight problems didn’t lose sufficient weight to fulfill the targets of a mid-stage examine, dealing a setback to the biotech’s bid to revive a category of medicines as soon as written off on account of security dangers. These issues didn’t emerge within the scientific trial, which Skye executives say recommend the drug might but show profitable with greater dosing.
The Skye drug, nimacimab, is an antibody designed to dam CB1, a receptor whose physiological roles embody regulating urge for food. San Diego-based Skye is evaluating the weekly injectable drug in a 136-patient Section 2a examine. The preliminary outcomes reported Monday present individuals who obtained Skye’s nimacimab as a monotherapy misplaced a mean 1.52% of their physique weight after 26 weeks in comparison with 0.26% weight reduction for the placebo arm — not sufficient to be statistically vital.
The mixture of the examine drug with Novo Nordisk’s Wegovy was higher, attaining a clinically significant common 13.2% loss in weight in comparison with 10.25% within the arm that obtained Wegovy and a placebo. Whereas these outcomes fell in need of statistical significance, weight reduction didn’t plateau at 26 weeks, which the corporate mentioned signifies sufferers may proceed to lose extra weight with longer dosing.
Skye shares opened Monday at $1.81 every, down practically 62% from Friday’s closing value.
CB1 has each scientific and regulatory validation from Sanofi, which obtained European approval in 2006 for rimonabant, an oral small molecule inhibitor of the goal. Whereas concentrating on CB1 within the gastrointestinal tract can assist sufferers shed extra pounds, this receptor can also be discovered within the central nervous system. Rimonabant hit these receptors within the mind, resulting in suicidal ideation in some sufferers. In 2008, Sanofi withdrew the drug from the market.
Skye designed nimacimab to be peripherally restricted, blocking CB1 in gastrointestinal tract however avoiding the CNS. In an interview final 12 months, Chief Growth Officer Tu Diep defined that as an antibody, nimacimab is simply too giant to penetrate the blood-brain barrier — which ought to keep away from inflicting the complication dangers noticed with rimonabant. Within the Section 2a outcomes, Skye mentioned nimacimab alone and together with Wegovy confirmed a clear security profile. Not solely had been there no extra gastrointestinal unwanted side effects, there have been additionally no neuropsychiatric adversarial occasions reported.
Sufferers who accomplished the 26-week examine had been eligible to enroll in a 26-week extension examine. Enrollment is full and Skye expects knowledge will probably be accessible within the first quarter of subsequent 12 months. Extra detailed outcomes from the preliminary 26-week interval will probably be offered subsequent month throughout the ObesityWeek convention in Atlanta.
The 200 mg, once-weekly dose was primarily based on modeling from Section 1 testing suggesting vital peripheral publicity of the drug however little to no publicity within the mind, Skye mentioned in an investor presentation. The corporate mentioned preclinical knowledge and modeling of the nimacimab’s pharmacokinetics (PK) — how the physique interacts with the drug all through its publicity within the physique — point out the drug’s potential at greater doses.
“With our preclinical knowledge, toxicology security margins, and PK modeling, we consider we’ve got a path to assist greater dosing, and we’re evaluating the subsequent stage of improvement to optimize dosing in potential future scientific trials,” Chief Medical Officer Puneet Arora mentioned within the Skye announcement.
Skye is making an attempt to set itself aside in a small group of firms working to revive CB1 inhibition as a solution to deal with weight problems. Novo Nordisk’s 2023 acquisition of Inversago Pharma introduced a lead program, now referred to as monlunabant, that’s an oral small molecule inhibitor of CB1. Whereas this drug has mid-stage knowledge displaying statistically vital weight reduction, outcomes confirmed neuropsychiatric results. Corbus Prescribed drugs’ CRB-913 can also be a peripherally restricted oral small molecule inhibitor of CB-1; the corporate expects to start a Section 1b dose-ranging examine within the fourth quarter of this 12 months.
Skye mentioned within the investor presentation it is going to give attention to a mixture technique with Wegovy whereas persevering with to judge greater doses of nimacimab as a monotherapy. The corporate may also assess nimacimab’s potential as a upkeep remedy for sufferers who’ve achieved goal weight reduction with a GLP-1 weight reduction drug. Within the scientific trial outcomes thus far, nimacimab didn’t improve the frequency or severity of gastrointestinal unwanted side effects which might be a typical purpose cited for discontinuing remedy. That might give the Skye drug a security and tolerability benefit over continual use of GLP-1 medicine.
For Skye to proceed with greater dosing of nimacimab as a monotherapy, William Blair analyst Andy Hsieh mentioned it’s crucial to cut back the affected person dosing burden, which is at the moment two injections, 100 mg per syringe. Hsieh is extra intrigued by the Skye drug’s potential use together with Wegovy. The outcomes present that the 2 medicine collectively led to a 13% placebo-adjusted weight reduction, which was throughout the double-digit vary that Skye had set and confirmed separation from remedy with Wegovy alone, he mentioned in a word despatched to traders.
“We’re disillusioned by the scientific setback of nimacimab,” Hsieh wrote. “Nevertheless, we’re hopeful that with greater doses (corresponding to 600 mg or 1,000 mg per week), nimacimab may present extra substantial monotherapy exercise and intensify its capacity to be mixed with Wegovy.”
Picture: Peter Dazeley, Getty Photos