FDA Approves Novartis’ Kymriah Cancer Gene Therapy
FDA says it has approved Novartis’ Kymriah (tisagenlecleucel) as the first gene therapy available in the U.S. An agency statement says Kymriah is indicated for treating certain pediatric and young adult patients with a form of acute lymphoblastic leukemia (ALL). Specifically, it is approved in the U.S. for treating patients up to age 25 with B-cell precursor ALL that is refractory or in second or later relapse.
Kymriah is described as a genetically-modified autologous T-cell immunotherapy. Each dose is a customized treatment created using a patient’s own T-cells. The T-cells are collected and sent to a manufacturing center where they are genetically modified to include a new gene that contains a specific protein that directs the T-cells to target and kill leukemia cells that have a specific antigen on the surface. Once the cells are modified, FDA says, they are infused back into the patient to kill the cancer cells.
The safety and efficacy of Kymriah were demonstrated in one multicenter clinical trial of 63 pediatric and young adult patients with relapsed or refractory B-cell precursor ALL. The overall remission rate within three months of treatment was reported as 83%.
The therapy labeling includes a Boxed Warning for cytokine release syndrome (CRS), a systemic response to the activation and proliferation of chimeric antigen receptor (CAR) T-cells causing high fever and flu-like symptoms, and for neurological events. There are other serious side effects.
FDA also says it has expanded the approval for Genentech’s Acterma (tocilizumab) to treat CAR T-cell induced severe or life-threatening CRS in patients two years of age or older. It reports that in clinical trials in patients treated with CAR T-cells, 69% of patients had complete resolution of CRS within two weeks following one or two Acterma doses.
Because of the risk of CRS and neurological events, Kymriah was approved with a risk evaluation and mitigation strategy that includes elements to assure safe use. The agency says it is requiring that hospitals and their associated clinics that dispense Kymriah be specially certified.