On June 27, 2014 GlaxoSmithKline and Genmab reported that the Phase III study of ofatumumab (Arzerra) versus physicians’ choice in patients with bulky fludarabine-refractory chronic lymphocytic leukaemia (CLL) did not meet its primary endpoint of progression free survival (PFS) (Press release Genmab, JUN 27, 2014, View Source [SID:1234500604]). The median PFS, as assessed by the Independent Review Committee, was 5.36 months for ofatumumab and 3.61 months for physicians’ choice (Hazard Ratio 0.79, p=0.267).
The result reported here is headline data; the full analysis of safety and efficacy data is underway and will be completed in the coming months. This study (OMB114242) was conducted to meet the requirements from the EU Commission for the conditional approval of ofatumumab for the treatment of CLL in patients who are refractory to fludarabine and alemtuzumab. The current indications in the EU or US do not include bulky fludarabine-refractory CLL patients.
“It was our priority to share this result with the scientific community as soon it became available. We will now work to further analyse the data and to better understand the totality of the efficacy and safety findings,” said Dr. Rafael Amado, Head of Oncology R&D at GSK. “We are very grateful to the CLL patients who participated in this trial.”
“Although ofatumumab performed broadly in-line with previous data, today’s result is disappointing. Based on this result, we do not anticipate applying for a label expansion for ofatumumab in this specific refractory CLL population,” said Jan van de Winkel, Ph.D., Chief Executive Officer of Genmab.
About the study
This Phase III open-label study randomised 122 patients with bulky fludarabine-refractory CLL to one of two treatment arms. Patients were randomised to either ofatumumab or physicians’ choice (2:1). Patients randomised to ofatumumab received an initial dose of 300 mg, followed 1 week later by 2,000 mg once weekly for 7 weeks, followed 4 weeks later by one infusion of 2,000 mg every 4 weeks for a total treatment duration of 6 to 12 months. Patients in the physicians’ choice arm received a treatment regimen chosen by a physician for up to six months.
The primary endpoint of the study was progression free survival as adjudicated by the Independent Review Committee. Secondary objectives are to evaluate response, overall survival, safety, tolerability and health-related quality of life of subjects treated with ofatumumab versus physicians’ choice of treatment.