On March 29, 2022 Aptevo Therapeutics Inc. (NASDAQ:APVO), a clinical-stage biotechnology company focused on developing novel immuno-oncology therapeutics based on its proprietary ADAPTIR and ADAPTIR-FLEX platform technologies, reported that a patient with relapsed/refractory acute myeloid leukemia or AML in a monotherapy arm of its on-going Phase 1b trial evaluating adult patients with AML, has received an allogeneic stem cell transplant subsequent to receiving APVO436 and experiencing significant reduction in bone marrow blasts (Press release, Aptevo Therapeutics, MAR 29, 2022, View Source [SID1234611133]). This follows the Company’s previous announcement that a patient receiving combination therapy is also moving to transplant after one cycle of therapy.
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"We are very pleased to report that a refractory secondary AML patient, after receiving APVO436 as monotherapy, experienced a significant reduction in bone marrow blasts, tolerated the treatment well, experienced clinical benefit and was therefore able to proceed to allogeneic transplant. Prior to trial entry, this patient had refractory disease after receiving multiple other lines of therapy and had a very poor prognosis. There were few therapeutic options left with which to fight the disease," said Justin Watts, MD, Associate Professor of Medicine, Chief, Leukemia Section at the University of Miami Sylvester Comprehensive Cancer Center and treating investigator. "Without APVO436, this patient would not have proceeded to transplant, a highly desirable outcome for patients with AML."
APVO436 is currently being evaluated in a Phase 1b expansion trial for adult patients with AML in a multi-center, multi-cohort study of up to 90 patients who will receive either APVO436 in combination with standard of care chemotherapies or as monotherapy. In 2021, the Company announced results from its Phase 1b dose escalation trial in patients with both AML and myelodysplastic syndrome or MDS. Results showed that APVO436 exhibited a favorable safety profile with acceptable tolerability and generally manageable drug-related adverse events. Promising clinical activity was also observed in 11 of 40 patients (27.5%) in the dose escalation part of the study and reported at the American Society of Hematology (ASH) (Free ASH Whitepaper) 2021. This included two complete remissions in patients with AML and three complete marrow responses in patients with MDS.
"We are excited that a patient receiving monotherapy proceeded to transplant in the expansion trial, further demonstrating APVO436 clinical activity in AML and in support of our findings from the dose escalation part of the trial reported last year, said Dirk Huebner, MD, Senior Medical Advisor at Aptevo. "While our clinical evaluation of APVO436 is still in early stages, the safety profile, overall tolerability, and clinical activity reported to date demonstrate the potential for APVO436 to have meaningful impact on the AML treatment paradigm."
About APVO436
Overexpression of CD123 is the hallmark of many forms of leukemia. Aptevo’s lead proprietary drug candidate, APVO436 is a bispecific CD3xCD123 ADAPTIR that is designed to redirect the immune system of the patient to destroy leukemia cells expressing the target CD123 molecule on their surface. This antibody-like recombinant protein therapeutic is designed to engage both leukemia cells and T-cells of the immune system and bring them closely together to trigger the destruction of leukemia cells. APVO436 has been engineered using Aptevo’s proprietary and enabling bioengineering methods and is designed to reduce the likelihood and severity of cytokine release syndrome (CRS). APVO436 has received orphan drug designation ("orphan status") for AML according to the Orphan Drug Act.