The European Medicines Agency’s Committee for Orphan Medicinal Products (COMP) has adopted positive opinions recommending orphan designation for KTE-C19 to treat acute lymphoblastic leukemia, chronic lymphocytic leukemia/small lymphocytic lymphoma, and follicular lymphoma.
KTE-C19 is an investigational chimeric antigen receptor (CAR) T-cell therapy designed to target CD19, a protein expressed on the surface of B cells.
The CAR T-cell therapy already has orphan designation for the treatment of diffuse large B-cell lymphoma in the US and the European Union (EU).
KTE-C19 also has COMP positive opinions for orphan designation in the EU for primary mediastinal B-cell lymphoma and mantle cell lymphoma.
About orphan designation
The COMP adopts an opinion on the granting of orphan designation, and that opinion is submitted to the European Commission for endorsement.
In the EU, orphan designation is granted to therapies intended to treat a life-threatening or chronically debilitating condition that affects no more than 5 in 10,000 persons and where no satisfactory treatment is available.
Companies that obtain orphan designation for a drug benefit from a number of incentives, including protocol assistance, a type of scientific advice specific for designated orphan medicines, and 10 years of market exclusivity once the medicine is approved. Fee reductions are also available, depending on the status of the sponsor and the type of service required.
KTE-C19 research
Last year, researchers reported results with KTE-C19 in the Journal of Clinical Oncology. The study included 15 patients with advanced B-cell malignancies.
The patients received a conditioning regimen of cyclophosphamide and fludarabine, followed 1 day later by a single infusion of the CAR T-cell therapy. The researchers noted that the conditioning regimen is known to be active against B-cell malignancies and could have made a direct contribution to patient responses.
Thirteen patients were evaluable for response. Eight patients achieved a complete response (CR), and 4 had a partial response (PR).
Of the 7 patients with chemotherapy-refractory diffuse large B-cell lymphoma, 4 achieved a CR, 2 achieved a PR, and 1 had stable disease. Of the 4 patients with chronic lymphocytic leukemia, 3 had a CR, and 1 had a PR. Among the 2 patients with indolent lymphomas, 1 achieved a CR, and 1 had a PR.
KTE-C19 was associated with fever, low blood pressure, focal neurological deficits, and delirium. Toxicities largely occurred in the first 2 weeks after infusion.
All but 2 patients experienced grade 3/4 adverse events. Four patients had grade 3/4 hypotension.
All patients had elevations in serum interferon gamma and/or interleukin 6 around the time of peak toxicity, but most did not develop elevations in serum tumor necrosis factor.
Neurologic toxicities included confusion and obtundation, which have been reported in previous studies. However, 3 patients developed unexpected neurologic abnormalities.
KTE-C19 is currently under investigation in a phase 1/2 trial (ZUMA-1) of patients with refractory, aggressive non-Hodgkin lymphomas. Kite Pharma, Inc., the company developing KTE-C19, plans to present top-line phase 1 data at the 2015 ASH Annual Meeting.
