By Pat Anson

The Food and Drug Administration has given the go-ahead for a late-stage clinical trial of an injectable stem cell product that could give new hope to millions of patients suffering from lower back pain caused by degenerative disc disease (DDD).  Up to 400 patients with mild to moderate DDD are expected to enroll in the Phase 3 study later this year.

The trial is being conducted by DiscGenics, a Utah-based biopharmaceutical company that is developing new cell-based therapies for musculoskeletal conditions. It’s one of the first late-stage studies of a stem cell product to win approval from the FDA, which has been openly skeptical of cell-based therapies due to lack of evidence proving their safety and efficacy in clinical trials.

The only stem cell therapies currently approved by the FDA are used to treat sickle cell disease and some cancers. Approval of a stem cell product to treat degenerative discs would be a big step forward for regenerative medicine, and give patients an alternative to fusions and other more invasive spinal procedures.

“The FDA has been very familiar with our process, our product, and the chemistry, manufacturing and controls for quite some time,” says Flagg Flanagan, CEO and Chairman of DiscGenics. “We feel really good about where we are in terms of the patient reported outcomes. But most importantly about the safety. We feel like this cell is extremely safe to be used on human patients and we're feeling really, really good that we can help a lot of people.”

Discgenics’ injectable disc cell therapy (IDCT) is a single-injection biologic treatment designed to halt the progression of lumbar DDD by regenerating the disc “from the inside out.” The active ingredients in IDCT are enriched stem cells known as discogenic cells, which are derived from donated adult human disc tissue.

IDCT has been granted regenerative medicine advanced therapy and Fast Track designations by the FDA. Approval of the Phase 3 study came just weeks after Discgenics released positive results from a combined Phase 1/Phase 2 human trial of IDCT, published in the International Journal of Spine Surgery.

In that study, 60 patients with mild to moderate DDD were randomly assigned to receive an injection of either low-dose discogenic cells, high-dose cells, or a placebo. After one year, patients in the high-dose group had an average reduction in pain intensity of nearly 63 percent, along with significant improvements in their disability and quality of life. The regeneration of discs, which was monitored through MRIs and other imaging tests, was sustained two years after the injection.

“Things even came out a little better than we even expected,” Flanagan told PNN. “We showed very good durability, out to two years with the high dose patients. Anecdotally, we continue to follow some of those high dose patients and we have data in a pretty good cohort out to three years. We have a couple (patients) out to four years and the durability still seems to hold pretty well.”

The Phase 3 trial will consist of two parallel studies of IDCT that will also be randomized and placebo-controlled. Like the two earlier trials, each study will last for two years to assess the long-term safety and efficacy of IDCT. The first participants are expected to be enrolled in the final quarter of 2024.

“We'll start looking for patients and reviewing patient profiles that want to apply for the study shortly,” Flanagan said. “I think this is something where we can help many, many patients hopefully avoid a surgical intervention with an injection in a treatment room.”

People interested in getting updates on the Phase 3 IDCT trial or volunteering for it can submit their contact information to DiscGenics here.

Mesoblast, an Australian company specializing in regenerative medicine, recently began enrolling U.S. patients with chronic low back pain in a Phase 3 study of its proprietary mesenchymal stem cells, which are derived from young and healthy adult donors.