APVO....NR this a.m Aptevo Therapeutics Provides Pipeline Update
2024-04-10 06:04 ET - News Release
- Breast cancer patient who improved from a progressive disease diagnosis to an over nine-month sustained stable disease diagnosis has now successfully transitioned to a higher dose level, accessing the potential for greater clinical benefit in the ALG.APV-527 clinical trial
- Cohort 5 dosing imminent, trial more than 50% enrolled
- APVO436 Phase 1b/2 dose optimization trial initiation expected 1H 2024
- Premier CRO, Prometrika, engaged as partner for dose optimization trial to evaluate APVO436 in frontline AML in combination with venetoclax + azacitidine in venetoclax nave patients
- APVO711 demonstrates its ability to induce tumor killing properties in preclinical studies
- APVO711 dual mechanism checkpoint inhibitor with unique precision targeting capabilities progressing towards IND
SEATTLE, WA / ACCESSWIRE / April 10, 2024 / Aptevo Therapeutics Inc. (NASDAQ:APVO), a clinical-stage biotechnology company focused on developing novel immune-oncology therapeutics based on its proprietary ADAPTIR™ and ADAPTIR-FLEX™ platform technologies, today announced advancements in both clinical programs and one preclinical program.
A heavily pretreated breast cancer patient, enrolled in the ALG.APV-527 Phase 1 open-label, multi-center, multi-cohort trial for the treatment of multiple solid tumor types, entered the trial and improved from progressive disease to long-lasting stable disease (SD) while on therapy. The patient has remained on study for more than nine months and been successfully transitioned to a higher dose level, which may allow for increased clinical benefit. The trial is more than 50% enrolled and dosing in cohort five (of six) is imminent.
"I'm encouraged by the promise that ALG.APV-527 brings to the treatment of solid tumor patients. Witnessing a patient maintaining a stable disease, especially for more than nine months, and then moving to a higher dose level within a Phase 1 trial is uncommon, but we believe it can be therapeutically beneficial for this patient and is a testament to the drug's clinical potential," stated Dirk Huebner, MD, Chief Medical Officer at Aptevo.
The Company is on track to initiate part 1 of its upcoming two-part Phase 1b/2 trial in 1H 2024. The study will further evaluate APVO436 for the treatment of acute myeloid leukemia (AML). Aptevo has partnered with premier CRO, Prometrika, for the upcoming study. The first part is a dose optimization trial evaluating standard of care venetoclax + azacitidine along with APVO436 as a frontline treatment for AML patients. It is planned as an open-label, multi-center, multi-cohort study. The trial will evaluate safety/tolerability and efficacy of the triplet combination at multiple dose levels.
The therapeutic combination of venetoclax + azacitidine + APVO436 was selected based on outcomes from the Company's dose expansion trial that showed promising outcomes across all categories of evaluation including safety, efficacy, and duration of remission.
"We are eager to initiate the next phase of development in support of lead candidate APVO436 as a therapeutic option in combination therapy for the treatment of AML," said Marvin White, President and CEO of Aptevo. "APVO436 results have been positive across the board. For example, we demonstrate an exemplary safety profile, noting that patients experienced cytokine release syndrome at rates that are about one-third the benchmarks demonstrated in literature. Similarly, efficacy results demonstrate clinical responses that are almost double the benchmarks in literature. We anticipate that our dose optimization results will reinforce our growing body of data and demonstrate the clinical potential of APVO436 in patients with frontline AML."
APVO711 is currently progressing through preclinical evaluation intended to target a broad range of solid tumors. The Company continues to move this anticancer checkpoint inhibitor with added dual mechanism of action functionality toward the clinic. Key learnings to date include:
- APVO711 imparts beneficial attributes to both antigen presenting cells and T cells that boost the immune response targeted at controlling tumor cells
- Experiments in cultured cells have confirmed that APVO711 enhances tumor cell killing by T cells
- In vivo studies have confirmed that APVO711 reduces the size of PD-L1-expressing tumors
"We are pleased with the progress we have made to date in preclinical studies for our dual mechanism checkpoint inhibitor APVO711. This PD-L1 x CD40 molecule, represents an anticancer approach that combines a checkpoint inhibitor with a potent immune mediator. This innovative therapeutic strategy holds promise for unleashing the full potential of the immune system to combat cancer, offering new hope for patients in need of more effective treatments," said Michelle H. Nelson, Ph.D., Director of Immunobiology at Aptevo Therapeutics.
More About the Programs
ALG.APV-527
ALG.APV-527 is a conditional 4-1BB agonist bispecific that is designed for activation only upon simultaneous binding to 4-1BB and 5T4. It is designed to target cancer cells by activating both T cells and natural killer cells and is intended to bind to tumor-specific antigens while sparing healthy cells and maximizing immune response. This has the potential to be clinically important because 4-1BB can stimulate the immune cells (antitumor-specific T cells and NK cells) involved in tumor control, making 4-1BB a particularly compelling target for cancer immunotherapy. The compound is currently being evaluated for multiple solid tumor types in a multi-center, dose escalation trial that is more than 50% enrolled.
Additional promising preliminary data includes:
- In addition to the patient described above, a second heavily pretreated breast cancer patient who was progressing prior to enrolling in the trial has sustained long lasting stable disease and remained on study drug for seven months. Analysis demonstrated measurable level of drug in circulation (pharmacokinetic) and reproducible elevation of serum pharmacodynamic markers with dosing, suggesting