DENVER — , with good results in treatment-refractory and treatment-naive patients, according to results from a phase 2 clinical trial.
‘Impressive’ Results
The results were impressive, especially given that riliprubart outperformed IVIG, according to Frank Tennigkeit, PhD, senior director of pediatric development rare diseases at UCB Biosciences, who attended the session at the 2024 annual meeting of the American Academy of Neurology, where the study was presented. “There are few trials on CIDP, and the standard data are IVIG data.
“This is really amazing, especially in refractory patients. I turned to my neighbor [during the presentation] and said, ‘I’ve never seen CIDP data that good in my life. It works in all kinds of different patient populations, and also on the refractory ones. That’s what you want. That’s where the need is. And you saw a consistent effect and a strong effect on top of standard of care,” said Dr. Tennigkeit.
“It’s impressive. The only problem with CIDP is that it’s very difficult to compare treatments, because everyone has a different outcome. This was an open-label study, so there’s always a confounding bias. The proof of the pudding is going to be in a phase 3 blinded, randomized trial, but what I really admire about them, and I thought was very gutsy, is that they’re going head-to-head versus IVIG. I haven’t seen anyone who’s done that yet [in CIDP],” said Shalom Patole, MD, an internist and telehealth consultant in India, who also attended the session.
An Open-Label Phase 2 Study
The study had a somewhat unique design, according to Richard Lewis, MD, who presented the results. It was an open-label design that examined three subpopulations: 25 who had objective response to treatments (standard of care [SOC]–treated, mean age, 58.2 years; 80% male), 18 refractory patients who had been off treatment for up to 12 weeks (SOC-refractory, mean age, 63.9 years; 61% male), and 12 patients who had not been treated at all for at least 6 months or were treatment-naive (SOC-naive, mean age, 59.1 years; 67% male).
At 24 weeks, “if you looked at the treated group, 88% of those patients improved to remain stable, and only 12% relapsed. Most significantly, these patients who had responded to their IVIG, who were supposedly doing pretty well, 44% of those actually got better, so they improved from what would have been a pretty good baseline. The refractory patients, despite flunking the other treatments, 50% actually passed or improved with the treatment, so a significant response rate in a group that was not responding so well,” said Dr. Lewis, who is a neurologist at Cedars Sinai Medical Center.
The researchers also found that treatment with riliprubart led to inhibition of complement activity and a trend in reduction in neurofilament light chain levels by week 24 in all three groups.
Treatment-emergent adverse events occurred in 60% of the SOC-treated group, 72% of the SOC-refractory group, and 75% of the SOC-naive group, though grade 3 or higher events were rare (4%, 17%, and 8%, respectively). There was one death in the SOC-treated group and one in the SOC-refractory group. Both patients were elderly and had comorbid conditions.