Orphan Drug Status for NantKwest ‘Killer’ Cell Therapy

FDA has granted NantKwest an orphan drug designation for the company’s activated natural killer (aNK) cell therapy for treating patients with advanced Merkel cell carcinoma. The therapy is currently in a Phase 2 clinical trial at sites in the U.S. treating subjects with metastatic or locally advanced Merkel cell carcinoma. The protocol in this study was recently amended to include ALT-803, an IL-15 superagonist therapy that has been shown in preclinical clinical studies to improve the activity of NK cells and will “synergistically improve the activity of both NantKwest’s infused aNK cells together with the subject’s own NK cells,” the company says. The designation was based in part on interim data showing that the therapy demonstrated activity in patients who failed multiple lines of therapy including check point inhibitors.

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