ATryn(R) Meets Primary Endpoint
Monday February 4, 4:30 pm ET
Rolling BLA Submission Initiated
FRAMINGHAM, Mass.--(BUSINESS WIRE)--GTC Biotherapeutics, Inc. ("GTC", Nasdaq: GTCB) announced today that ATryn® has met the statistical requirements for the primary endpoint in the pivotal study for the treatment of patients with hereditary antithrombin deficiency, or HD, undergoing high-risk surgical or childbirth procedures. The primary endpoint was demonstration of non-inferiority to plasma-derived antithrombin in preventing clinically relevant deep vein thromboses, or DVTs, or other thromboembolisms.
GTC also announced that it has initiated the filing of the associated Biologics License Application, or BLA, by submitting the preclinical and manufacturing sections. The last section to be filed is expected to be the full clinical study results around mid-year, once all reviews of the data have been completed. GTC is seeking priority review in conjunction with the BLA submission, and on that basis anticipates approval of the BLA approximately 6 months after submission of the last section. GTC previously received approval to commence the BLA filing on a rolling basis when ATryn® was granted fast track status by the Food and Drug Administration, or FDA. Separately, ATryn® has also been designated an orphan drug for the HD indication.
The completed comparator arm of the study is based on historical data gathered under a prospective clinical protocol from patients who had been previously treated with plasma-derived antithrombin products while undergoing similar high-risk procedures to those performed in the active arm. There were no clinically relevant DVTs or other thromboembolisms in these patients.
A minimum of 31 evaluable HD patients are required for the ATryn® treatment trial. Results for 14 of these patients were already obtained from the previous study that supported ATryn®’s approval in the European Union for HD patients undergoing surgical procedures. Seventeen additional patients have been treated, of which 16 are considered evaluable. One patient is considered unevaluable due to the course of treatment deviating from the clinical protocol. None of the additional patients had clinically relevant DVTs or other thromboembolisms during the evaluation period. On this basis, the study has already met the statistical requirements for non-inferiority. Although the primary endpoint has already been met, enrollment is being extended through February to include an additional patient to ensure that the minimum number of evaluable patient procedures agreed upon with the FDA is satisfied.
“We look forward to moving into the regulatory review process with the FDA on the basis of having met the primary endpoint for ATryn®’s clinical studies,” stated Geoffrey F. Cox, PhD, GTC’s Chairman and CEO. “We are grateful to the many physicians and clinical sites that supported the most robust clinical study in hereditary deficient patients ever attempted for any antithrombin product. ATryn® is also unique in being the only recombinant form of human antithrombin to be developed for therapeutic use.”
Complete safety and efficacy data will be available for the BLA submission after the last patient is enrolled. The completed clinical data package will include 90-day follow-up tests for antibody generation to ATryn® after the last patient is treated, which is a typical regulatory requirement and was also part of the approval process successfully completed for the European Union.
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