The U.S. Food and Drug Administration approved Omisirge (omidubicel-onlv), a substantially modified allogeneic (donor) cord blood-based cell therapy to quicken the recovery of neutrophils (a subset of white blood cells) in the body and reduce the risk of infection. The product is intended for use in adults and pediatric patients 12 years and older with blood cancers planned for umbilical cord blood transplantation following a myeloablative conditioning regimen (treatment such as radiation or chemotherapy). 

“Today’s approval is an important advance in cell therapy treatment in patients with blood cancers,” said Peter Marks, M.D., Ph.D., director of the FDA’s Center for Biologics Evaluation and Research. “Hastening the return of the body’s white blood cells can reduce the possibility of serious or overwhelming infection associated with stem cell transplantation. This approval reflects the FDA’s continued commitment to supporting development of innovative therapies for life-threatening cancers.”

Stem cell transplantation is a common treatment for blood cancers. It involves putting healthy stem cells into the body to help restore the normal production and function of blood cells. One source of healthy stem cells is umbilical cord blood. Generally, before receiving this kind of transplant, the patient will undergo a course of treatments to remove their own stem cells and prepare the body for the new stem cells. This process may include undergoing therapies such as radiation or chemotherapy, both of which may weaken an individual’s immune system. As a result, a frequent and serious risk of this treatment is the occurrence of severe and sometimes deadly infections.

Omisirge, administered as a single intravenous dose, is composed of human allogeneic stem cells from umbilical cord blood that are processed and cultured with nicotinamide (a form of vitamin B3). Each dose is patient-specific, containing healthy stem cells from an allogeneic pre-screened donor, meaning it comes from a different individual rather than using the patient’s own cells. The safety and effectiveness of Omisirge was supported by a randomized, multicenter study comparing transplantation of Omisirge to transplantation of umbilical cord blood, in subjects between the ages of 12 and 65 years. The study enrolled a total of 125 subjects. All subjects in the study had confirmed blood cancers. The efficacy of Omisirge was based on the amount of time needed for recovery of the subject’s neutrophils (a type of white blood cell that helps protect the body from infections) and the incidence of infections following transplantation.

Eighty-seven percent of subjects who were randomized to receive Omisirge achieved neutrophil recovery with a median of 12 days following treatment with the product, compared to 83% of subjects who were randomized to receive umbilical cord blood transplantation and who achieved neutrophil recovery with a median of 22 days. Bacterial or fungal infections by 100 days following transplantation were seen in 39% of subjects receiving Omisirge versus 60% of subjects in the control group who received umbilical cord blood.

Treatment with Omisirge has the potential to cause severe side effects, which must be considered in assessing the risks and benefits of using this product. Similar to all approved umbilical cord products, the label carries a Boxed Warning for infusion reactions, graft versus host disease (GvHD – a condition that occurs when donor bone marrow or stem cells attack the graft recipient), engraftment syndrome (characterized by a non-infectious fever and rash), and graft failure (occurs when new cells do not produce white blood cells, red blood cells and platelets). 

The most common adverse reactions associated with Omisirge included infections, GvHD, and infusion reactions. Patients who receive Omisirge should be monitored for signs and symptoms of infusion reactions, GvHD, engraftment syndrome, graft failure, transmission of serious infections or rare genetic diseases from the donor cells, as well as life-long for secondary malignancies (cancers that can spread from the original site or emerge following treatment). 

This application received Priority Review, Breakthrough Therapy and Orphan designations.1

References

  1. Office of the Commissioner & Office of the Commissioner. (2023). FDA Approves Cell Therapy for Patients with Blood Cancers to Reduce Risk of Infection Following Stem Cell Transplantation. U.S. Food And Drug Administration. https://www.fda.gov/news-events/press-announcements/fda-approves-cell-therapy-patients-blood-cancers-reduce-risk-infection-following-stem-cell?utm_medium=email&utm_source=govdelivery

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