On May 12, 2022 Affimed N.V. (Nasdaq: AFMD) ("Affimed", or the "Company"), a clinical-stage immuno-oncology company committed to giving patients back their innate ability to fight cancer, reported an upcoming poster presentation demonstrating the cytotoxic potential of its CD123/CD16A-targeting innate cell engager (ICE) AFM28 at the Annual Meeting of the European Hematology Association (EHA) (Free EHA Whitepaper) to be held in Vienna, Austria on June 9 – 12, 2022 (Press release, Affimed, MAY 12, 2022, View Source [SID1234614411]).

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AFM28 is designed as a novel treatment for patients with relapsed/refractory (r/r) acute myeloid leukemia (AML) and high-risk myelodysplastic syndrome (HR-MDS).

Redirecting innate immune cells, particularly NK cells, to CD123 is very attractive as a novel treatment strategy in AML because both leukemic blasts and leukemic stem cells express this receptor and an efficient depletion of both cell types is critical for inducing long-term remission.

The data to be presented in a poster session at the EHA (Free EHA Whitepaper) on June 10, 2022 summarize the preclinical proof-of-concept and toxicology studies for AFM28. The CD123 and CD16A targeting ICE exhibited high-affinity binding to CD16A expressed on NK cells and high avidity conferring long cell surface retention.

In in vitro assays, AFM28 engaged NK cells to destroy CD123-positive tumor cell lines and primary leukemic cells via antibody-dependent cell-mediated cytotoxicity (ADCC), even when CD123 was expressed at low levels.

Moreover, AFM28 demonstrated the ability to deplete leukemic cells from patient bone marrow without lysing CD34-positive/CD123-negative cells suggesting sparing of hematopoietic stem and progenitor cells. In toxicology models using cynomolgus monkeys, AFM28 demonstrated highly effective target cell depletion which was associated with good tolerability and only minimal release of the inflammatory cytokine IL-6.

"CD123 is a highly interesting tumor antigen in AML that hasn’t reached its full therapeutic potential. We believe that engaging innate immune cells represents a differentiated therapeutic strategy to access the value of this target. Building on the promising data we have seen with AFM28 to date, we are excited to be preparing a first-in-human clinical study to investigate the safety, efficacy and biological activity of AFM28 as monotherapy. In parallel, we are planning a study to investigate AFM28 in combination with adoptive NK cell therapies," said Dr. Arndt Schottelius, Chief Scientific Officer at Affimed. "NK cell therapies have already demonstrated promising clinical activity in relapsed/refractory AML and we believe that AFM28 will improve this effect."

The abstract is accessible here: View Source

Poster details:
Title: Novel bispecific innate cell engager AFM28 for the treatment of CD123-positive acute myeloid leukemia and myelodysplastic syndrome
Authors: Jana-Julia Siegler, Nanni Schmitt, Jens Pahl, Torsten Haneke, Izabela Kozlowska, Séverine Sarlang, Alexandra Beck, Stefan Knackmuss, Paulien Ravenstijn, Uwe Reusch, José Medina-Echeverz, Jan Endell, Thorsten Ross, Daniel Nowak, and Christian Merz
Final abstract code: P482
Session date and time: Poster session on Friday, June 10th, 10:30 – 11:45 a.m. EDT / 16:30 – 17:45 CEST

About AFM28
AFM28, a tetravalent, bispecific CD123- and CD16A-binding ICE developed on Affimed’s ROCK platform, is designed to bring a new immunotherapeutic approach to patients with CD123+ myeloid malignancies, including acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS). It engages NK cells to initiate tumor cell killing via antibody-dependent cellular cytotoxicity (ADCC), even at low CD123 expression levels. Clinical development is planned as both monotherapy and in combination with allogeneic NK cells in patients with relapsed/refractory CD123+ leukemias.