On September 24, 2026 Aptevo Therapeutics Inc. ("Aptevo" or the "Company") (Nasdaq:APVO), a clinical-stage biotechnology company developing novel multispecific immuno-oncology therapeutics based on its proprietary ADAPTIR and ADAPTIR-FLEX platform technologies, reported progress in its next-generation trispecific programs. The Company is optimizing several trispecific candidates for reliable, scalable manufacturing, an essential step toward future human testing. Aptevo expects to enter Investigational New Drug ("IND") enabling studies for the lead candidate, APVO451, in 1H2027.
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Trispecific therapies are gaining attention across cancer drug development as researchers explore their potential to bring multiple complementary functions together in a single molecule. Trispecifics are engineered to do more than traditional antibody therapies. Each molecule can combine three complementary functions to recognize cancer, activate an immune attack and help overcome defenses that cancer uses to survive. Aptevo’s protein-engineering and process development expertise makes it possible to bring these carefully selected functions together in one stable molecule and create differentiated therapies for specific cancers.
"Trispecifics open an exciting new path in cancer drug development by allowing us to engineer several complementary functions into one therapy," said Peter Pavlik, PhD, Senior Director of Protein Engineering at Aptevo. "We are now taking the critical next step – optimizing trispecific candidates for reliable, scalable manufacturing, an essential step toward future human testing. Aptevo expects to enter Investigational New Drug ("IND")-enabling studies for the lead candidate, APVO451, in 1H2027. This progress reflects both the strength of our engineering capabilities and our ability to translate promising science into potential medicines."
The Company’s trispecific programs build on its multispecific expertise, offering the potential to create differentiated candidates – and value – across multiple cancer programs.
Why This Work Builds Value
Aptevo is moving its trispecific candidates beyond molecular design by developing reliable, scalable manufacturing methods to produce them for human testing. Showing that these complex molecules can be manufactured consistently helps reduce a major development risk and prepares the lead candidate for the steps required before human testing. The same expertise and capabilities may also support additional trispecific candidates, strengthening the broader ADAPTIR-FLEX platform and creating more opportunities for future clinical progress and partnerships.
Aptevo expects to present additional details on these ongoing development activities at an upcoming international scientific conference.
(Press release, Aptevo Therapeutics, SEP 24, 2026, View Source [SID1234671052])