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The European Medicines Agency (EMA) Committee for Medicinal Products for Human Use (CHMP) has refused marketing authorization to quizartinib for the treatment of patients with relapsed/refractory (R/R) acute myeloid leukemia (AML) with a FLT3-internal tandem duplication (ITD).1,2 Having reviewed the data presented, the EMA CHMP felt that despite marginal improvement in overall survival (OS), the study had limitations that did not allow the efficacy of quizartinib to be demonstrated sufficiently for approval. They concluded that the benefits did not outweigh the risks and refused the marketing authorization.1
In May 2019, quizartinib was also rejected by the United States (US) Food & Drug Administration (FDA). The FDA Oncologic Drug Advisory Committee voted 8–3 against approval of the new drug application (NDA) and raised questions regarding the generalizability and credibility of the data.3 Quizartinib had previously been granted orphan drug designation by the EMA and breakthrough therapy designation by the FDA.4,5
The results from the QuANTUM-R trial, which assessed the value of quizartinib compared to investigator’s choice of salvage chemotherapy, were recently published in Lancet Oncology.
Given as quizartinib vs salvage chemotherapy
This study concluded quizartinib monotherapy conferred a survival benefit compared to salvage chemotherapy, with a manageable safety profile for patients with FLT3-ITD R/R AML.
The ongoing QuANTUM-First study (NCT02668653) is evaluating quizartinib plus standard chemotherapy followed by quizartinib monotherapy will benefit patients with newly diagnosed AML.
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