Daiichi Sankyo Company, Limited (hereafter, Daiichi Sankyo) announces that the pivotal QuANTUM-R phase 3 study of single agent quizartinib met its primary endpoint of significantly prolonging overall survival compared to salvage chemotherapy in patients with relapsed/refractory acute myeloid leukemia (AML) with FLT3-ITD mutations after first-line treatment with or without hematopoietic stem cell transplantation (HSCT). Safety appears consistent with that observed at similar doses in the quizartinib program.
“Single agent quizartinib is the first FLT3 inhibitor to show a significant improvement in overall survival compared to cytotoxic chemotherapy in a randomized phase 3 study of patients with relapsed/refractory AML with FLT3-ITD mutations, a very aggressive form of the disease with limited treatment options,” said Antoine Yver, MD, MSc, Executive Vice President and Global Head, Oncology Research and Development, Daiichi Sankyo. “We sincerely thank all of the investigators and patients who participated in this study and will share the results of the QuANTUM-R study at an upcoming medical meeting. We look forward to working with regulatory authorities worldwide to potentially bring quizartinib to patients as quickly as possible.”
QuANTUM-R is a pivotal, global, phase 3, open-label randomized study that enrolled 367 patients with FLT3-ITD-mutated AML who were refractory to or in relapse (with duration of remission of six months or less) following standard first-line AML therapy with or without HSCT. Patients were randomized in a 2:1 ratio to receive either single agent oral quizartinib or salvage chemotherapy. The primary objective of the study was to determine whether single agent quizartinib prolonged overall survival compared to salvage chemotherapy.
Daiichi Sankyo intends to initiate regulatory submissions worldwide for quizartinib on the basis of the QuANTUM-R results. The topline results of QuANTUM-R will be presented at an upcoming scientific conference.