On November 1, 2018 argenx (Euronext & Nasdaq: ARGX), a clinical-stage biotechnology company developing a deep pipeline of differentiated antibody-based therapies for the treatment of severe autoimmune diseases and cancer, reported updated data from the ongoing Phase 1 dose-escalation part of its Phase 1/2 clinical trial of cusatuzumab (ARGX-110) in acute myeloid leukemia (AML) and high-risk myelodysplastic syndromes (MDS) (Press release, argenx, NOV 1, 2018, View Source [SID1234530646]). As of the data cut-off on July 16, 2018, a 92% (11/12 patients) overall response rate (ORR) was observed, with 42% of patients achieving minimal residual disease (MRD) negativity. The median response duration was 6.9 months as of the data cut-off date.
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Data from this ongoing AML trial are expected to be further updated, including ORR and duration of response, during a company workshop to be held around the American Society of Hematology (ASH) (Free ASH Whitepaper) Annual Meeting.
"The clinical data published today are encouraging and underscore our decision to move forward into a Phase 2 clinical trial of cusatuzumab in AML, which we launched earlier this year. These data also support the deep understanding of the disease biology of CD70 as demonstrated by the preclinical work of our collaborators at the University of Bern, highlighting cusatuzumab’s potential to offer a novel mechanism of action in AML against leukemic blasts and leukemic stem cell compartments," commented Nicolas Leupin, MD, Chief Medical Officer of argenx. "We look forward to providing an update on key metrics from the Phase 1 dose-escalation of the Phase 1/2 trial, including response rate and duration of response, at our annual workshop around ASH (Free ASH Whitepaper)."
Phase 1/2 Results for Cusatuzumab in AML
In this trial, argenx evaluated the safety, tolerability and efficacy of cusatuzumab in combination with azacytidine (AZA) in an open-label, Phase 1/2 clinical trial in 12 newly diagnosed AML patients unfit for intensive chemotherapy. The data published today are from all 12 patients across four dose cohorts (1 mg/kg, 3 mg/kg, 10 mg/kg and 20 mg/kg) from the Phase 1/2 dose-escalation trial.
As of the data cut-off on July 16, 2018, the ORR across the 12 patients was 92% (11/12 patients), including 9 patients (82%) with a complete response with or without hematologic recovery (CR/CRi), 1 patient (9%) who reached morphologic leukemia-free status, and 1 (9%) partial response (PR). The median duration on study as of data cut-off was 6.9 months, ranging from 2 to 14.4 months, with 7 patients still on study. Five patients (42%) achieved MRD negativity as measured by flow cytometry. Translational data demonstrated that cusatuzumab monotherapy and in combination with AZA
significantly reduced leukemic stem cells in the bone marrow of AML patients. Cusatuzumab continued to be well-tolerated in AML patients across the different doses. More details can be found here.
Cusatuzumab in Cutaneous T-cell Lymphoma
argenx also announced today updated results from its non-randomized, open-label, multicenter Phase 1/2 trial of cusatuzumab in 27 patients with cutaneous T-cell lymphoma (CTCL). More details can be found here.
argenx announced in May 2018 that it is no longer devoting resources to the development of cusatuzumab in CTCL in order to focus on the drug candidate’s potential in AML.
About Cusatuzumab
Cusatuzumab (ARGX-110) is an investigational SIMPLE Antibody targeting CD70, an immune checkpoint target involved in hematological malignancies, several solid tumors and severe autoimmune diseases. Cusatuzumab is designed to: block CD70, kill cancer cells expressing CD70 through complement dependent cytotoxicity, enhanced antibody-dependent cell-mediated phagocytosis and enhanced antibody-dependent cell-mediated cytotoxicity, and restore immune surveillance against solid tumors (Silence K. et al. mAbs 2014; 6 (2):523-532). Cusatuzumab is currently being evaluated in patients with hematological malignancies, including a Phase 1/2 trial in combination with azacitidine in patients with newly diagnosed acute myeloid leukemia (AML) and high-risk myelodysplastic syndromes (MDS) and the Phase 2 part of a Phase 1/2 trial in patients with relapsed/refractory cutaneous T-cell lymphoma (CTCL). Preclinical work on cusatuzumab in AML was performed in collaboration with the Tumor Immunology Lab of Prof. A. F. Ochsenbein at the University of Bern, who won, together with Prof. Manz at the University Hospital of Zürich, the prestigious 2016 Otto Naegeli Prize for his breakthrough research on CD70/CD27 signaling with therapeutic potential for cancer patients.