Are Cellular Therapies the Future of Autoimmune Disease?
A revolutionary treatment for cancers may also be able to treat and reset the immune system to provide long-term remission or possibly even cure certain Autoimmune Diseases.
Chimeric antigen receptor (CAR) T-cell therapy has offered a novel approach to treating hematologic cancers since 2017, but there are early signs that these cellular immunotherapies could be repurposed for B-cell mediated autoimmune diseases.
In September of last year, researchers in Germany reported that five patients with refractory systemic lupus erythematosus (SLE) treated with CAR T-cell therapy all achieved drug-free remission. At the time of publication, no patients had relapsed for up to 17 months after treatment. The authors described seroconversion of antinuclear antibodies in two patients with the longest follow-up, "indicating that abrogation of autoimmune B-cell clones may lead to a more widespread correction of autoimmunity," the researchers write.
In another case study published in June, researchers used CD-19 targeted CAR-T cells to treat a 41-year-old man with refractory antisynthetase syndrome with progressive myositis and interstitial lung disease. Six months after treatment, there were no signs of myositis on MRI and a chest CT scan showed full regression of alveolitis.
Since then, two biotechnology companies — Cabaletta Bio in Philadelphia and Kyverna Therapeutics in Emeryville, California — have already been granted fast-track designations from the US Food and Drug Administration for CAR T-cell therapy for SLE and lupus nephritis. Bristol-Myers Squibb is also conducting a phase 1 trial in patients with severe, refractory SLE. Several biotechnology companies and hospitals in China are also conducting clinical trials for SLE. But this is only the tip of the iceberg regarding cellular therapies for autoimmune disease, said Max Konig, MD, PhD, an assistant professor of medicine in the division of rheumatology at Johns Hopkins University School of Medicine in Baltimore.
"It's an incredibly exciting time. It's unprecedented in the history of autoimmunity," he noted.
A "Reboot" for the Immune System
B-cell targeted therapies have been around since the early 2000s with drugs like rituximab, a monoclonal antibody medication that targets CD20, an antigen expressed on the surface of B cells. The CAR T cells currently available target another surface antigen, CD19, and are a much more potent therapy. Both are effective at depleting B cells in blood, but these engineered CD19-targeted T cells can reach B cells sitting in tissues in a way that antibody therapies cannot, Konig explained.