Axoltis Pharma's phase 2 trial for amyotrophic lateral sclerosis (ALS) may have missed its primary endpoint, but the French biotech has pointed to secondary endpoints to justify persevering with the synthetic peptide.
The phase 2 study enrolled 82 patients with ALS in a double-blind, randomized, multicenter trial in France. Patients received either the drug, dubbed NX210c, at 5 mg/kg or 10 mg/kg doses or a placebo three times weekly for four weeks.
At six weeks, patients did not show a significant change from baseline in blood neurofilament light chain (NfL), a test used to evaluate leakage of NfL protein into the bloodstream when nerve cells are injured. While there was a trend of a decrease of NfL in the blood in 25.4% of patients in the NX210c arms of the study compared to 11.8% among the placebo-takers after four months, these results were not significant, Axoltis noted in a Sept. 15 release.
Benefits in motor function scale, measured using the harmonized revised amyotrophic lateral sclerosis functional rating scale, were observed with 64% and 33% reductions in patients treated with 5 mg/kg and 10 mg/kg NX210c, respectively. The reductions suggest improvement or slowing of decline in how well a person with ALS can control their physical and limb movements, according to Axoltis.
There was also a significant decrease in blood claudin-5, a protein released into the bloodstream when the blood-brain barrier (BBB) is disrupted, suggesting restoration of the BBB among the patients treated with 10 mg/kg of NX210c compared to those who received the placebo, the biotech said.
“The observed effect of NX210c in reducing plasma claudin-5 opens new avenues for the use of NX210c to treat a broad range of indications where blood-brain barrier dysfunction is observed, among them Alzheimer’s disease, Parkinson’s disease and multiple sclerosis,” Axoltis CEO Yann Godfrin, Ph.D., argued in the release.
ALS, also known as Lou Gehrig’s disease, is a neurodegenerative disease that destroys the nerve cells in the brain and spinal cord. As these nerve cells die, they stop sending signals to your muscles leading to impaired walking, talking, chewing and breathing.
The BBB is the brain’s protective wall responsible for blocking toxins and other pathogens from entering the brain while allowing nutrients to pass through to the organ. The barrier is made of endothelial cells that are packed very tightly so that forbidden molecules cannot pass. If a molecule wants to enter the brain, it has to either be small enough to diffuse through the tightly packed cells or use a transporter, such as claudin-5, a tight junction protein that is one of the main gatekeepers of the brain.
Axoltis' NX210c has a three-pronged approach of targeting BBB restoration, protecting neurons and enhancing intercellular communication. The therapy contains sequences from the subcommissural organ (SCO)-spondin, which is a glycoprotein essential for the process of neuron development that the SCO produces during embryonic development.
“These results are promising and contribute to generating evidence that NX210c’s properties are beneficial in neurodegenerative diseases, especially ALS,” Axoltis Chief Medical Officer Annette Janus, M.D., said in the release. “These findings support advancing NX210c to the next stages of clinical development.”
Available ALS therapies include Biogen's genetically targeted therapy Tofersen, which is used by patients with the SOD1 mutation. There's also Mitsubishi Tanabe's central nervous system agent Radicava—for which Shionogi acquired the rights last year—and the glutamate antagonist riluzole.
Other potential therapies are in the works. Coya Therapeutics finally received the go-ahead last month from the FDA to kick off a phase 2 study of COYA 302—which combines the biotech's IL-2 candidate with a CTLA4-Ig—while Corcept Therapeutics unveiled promising survival data in June from its mid-stage study in ALS despite a failure to slow ALS progression . Eli Lilly also became a player in the space last year after it penned a $415 million deal to license Alchemab’s early-stage ALS drug program.