On August 8, 2018, the U.S. Food and Drug Administration (FDA) approved mogamulizumab-kpkc (Poteligeo) for adult patients with relapsed or refractory mycosis fungoides (MF) or Sézary syndrome (SS) after at least one prior systemic therapy.
The approval of mogamulizumab-kpkc, a CC chemokine receptor type 4 (CCR4) directed monoclonal antibody, was based on a randomized, open-label, multicenter trial (Study 0761-010; NCT01728805) in patients with active MF or SS after at least one prior systemic therapy. Patients enrolled had a median of 3 prior therapies. The trial randomized 372 patients (44% with SS) to either mogamulizumab-kpkc or vorinostat.
Progression-free survival (PFS) was statistically significantly longer in the mogamulizumab-kpkc arm. The estimated median PFS was 7.6 months (95% CI = 5.6, 10.2) for those treated with mogamulizumab-kpkc compared with 3.1 months (95% CI = 2.8, 4.0) in the vorinostat arm (hazard ratio = 0.53; 95% CI = 0.41, 0.69). The confirmed overall response rate was 28% and 5%, respectively (p < 0.001).
The most common adverse reactions (reported in ≥ 20%) were rash, infusion-related reactions, fatigue, diarrhea, musculoskeletal pain, and upper respiratory tract infection. Serious adverse reactions occurred in 36% of patients, most often from infection (16% of all patients). The prescribing information includes warnings for dermatologic toxicity, infusion reactions, infections, autoimmune complications, and complications of allogeneic hematopoietic stem cell transplantation, including severe and refractory graft-versus-host disease.
The recommended mogamulizumab-kpkc dose is 1 mg/kg administered as an intravenous infusion over at least 60 minutes. Mogamulizumab-kpkc is administered on days 1, 8, 15, and 22 of the first 28-day cycle, then on days 1 and 15 of subsequent 28-day cycles until disease progression or unacceptable toxicity.
FDA granted this application priority review, breakthrough therapy designation, and orphan drug designation. A description of FDA expedited programs is in the Guidance for Industry: Expedited Programs for Serious Conditions-Drugs and Biologics.
Healthcare professionals should report all serious adverse events suspected to be associated with the use of any medicine and device to FDA’s MedWatch Reporting System or by calling 800-FDA-1088.
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