Aptevo Therapeutics Inc. (NASDAQ:APVO) Announces First Complete Remission in Ongoing APVO436 Phase 1 Clinical Trial

Aptevo Therapeutics Inc

SEATTLE, WA / USMarketWire/ November 3, 2020 / Aptevo Therapeutics Inc. (NASDAQ:APVO), a clinical-stage biotechnology company focused on developing novel immuno-oncology therapeutics based on its proprietary ADAPTIR™ platform, today provided an update on its ongoing APVO436 Phase 1 clinical trial.

APVO436 is a novel anti-CD123 x anti-CD3 targeted investigational bispecific antibody therapy being evaluated for the treatment of acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS), in a Phase 1/1b open-label, dose-escalation study evaluating the safety and pharmacokinetic profile.

Aptevo is pleased to announce that, based on preliminary data, a patient in cohort 6 of the clinical trial has shown complete remission.

In summary:

Patient bone marrow blasts decreased from 29% at the screen to 6% after the first cycle of treatment, and to 0% after the second cycle of treatment; and,

The patient’s platelet count and absolute neutrophil count (ANC) met complete remission criteria (CR).

“We are greatly encouraged by the complete remission in the patient in cohort 6, which is a wonderful outcome for them,” said Marvin White, President, and CEO of Aptevo Therapeutics. “We are now in a critical phase of the study, as pharmacokinetic modeling suggests that dosing in cohorts 5 through 8 is in a therapeutic range, which could result in the potential clinical activity of the drug. We look forward to continuing the dose-escalation and monitoring potential clinical responses as we advance through the upcoming dose cohorts,” concluded Mr. White.

APVO436 was built on Aptevo’s next-generation proprietary ADAPTIR™ protein therapeutic platform. Focused on generating novel, targeted bispecific antibody-based immunotherapies for cancer the ADAPTIR™ platform offers key advantages over other bispecific formats, derived in part from the flexible and modular nature of the ADAPTIR™ structure.

Aptevo believes that its differentiated ADAPTIR™ bispecific technology platform has the potential to offer a more convenient and cost-effective solution compared to other immunotherapies such as CAR-T therapies. While CAR-T therapies have proven effective in generating robust and durable treatment responses, they remain challenging and expensive to manufacture and administer to patients. In contrast, bispecific technologies may represent a simpler, more competitive ‘off-the-shelf’ solution in the rapidly advancing field of cancer immunotherapy.

About Aptevo Therapeutics Inc.

Aptevo Therapeutics Inc. is a clinical-stage biotechnology company focused on developing novel immunotherapies for the treatment of cancer. The Company’s lead clinical candidate, APVO436, and preclinical candidates, ALG.APV-527 and APVO603, were developed based on the Company’s versatile and robust ADAPTIR™ modular protein technology platform. The ADAPTIR™ platform is capable of generating highly differentiated bispecific antibodies with unique mechanisms of action for the treatment of different types of cancer. For more information, please visit www.aptevotherapeutics.com

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