Spectrum Pharmaceuticals Inc.’s attempts to distinguish its non-Hodgkin lymphoma treatment Zevalin (ibritumomab tiuxetan) from the significantly more successful Rituxan (rituximab) have landed the company an “untitled” letter from FDA’s Office of Prescription Drug Promotion.
Zevalin, approved to treat patients with relapsed or refractory, low-grade or follicular B-cell non-Hodgkin’s lymphoma (NHL) and patients with previously...
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