On January 16, 2023, Innate Pharma SA announced the publication of preclinical findings demonstrating the control of acute myeloid leukemia (AML) cells by a trifunctional NKp46-CD16a-NK cell engager (NKCE) targeting CD123 in the scientific journal Nature Biotechnology. Innate and Sanofi conducted the experiments, which were published in Nature Biotechnology on January 12, 2023.
This study demonstrates that CD64 expression on AML blasts imparts resistance to anti-CD123 antibody-dependent cell cytotoxicity (ADCC) and that redirecting NK cells against cancer targets by binding to CD16a and NKp46 circumvents this resistance. Moreover, through their binding to NKp46, CD123-NKCE primarily target NK cells and have substantial antitumor activity against primary AML blasts; they stimulate NK cell activation and cytokine secretion exclusively in AML cells' presence.
In vivo, its antitumor activity observed in a mouse tumor model surpasses that of the anti-CD123 antibody used as the comparator. Furthermore, in vitro in human peripheral blood mononuclear cells and in vivo in nonhuman primates, the efficacy of CD123-NKCE was associated with the induction of low pro-inflammatory cytokine release and the absence of toxicity.
These results support CD123-NKCE clinical development. IPH6101/SAR'579 (SAR443579), the first NKp46/CD16-based CD123-targeted ANKETTM NK cell engager, is currently being evaluated in a Phase 1/2 clinical trial by Sanofi in patients with relapsed or refractory acute myeloid leukemia (R/R AML), B-cell acute lymphoblastic leukemia (B-ALL), or high-risk myelodysplastic syndrome (HR-MDS).
About Innate Pharma
Headquartered in Marseille (France), Innate Pharma SA is a global, clinical-stage oncology-focused biotech firm dedicated to enhancing patient treatment and clinical outcomes using therapeutic antibodies that employ the immune system to combat cancer. Its extensive antibody pipeline has numerous potentially first-in-class clinical and preclinical candidates for cancers with a high unmet medical need. In addition, Innate has been a pioneer in the study of natural killer cell (NK cell) biology and developed its expertise in tumor antigens, tumor microenvironment, and antibody engineering. This innovative strategy has resulted in a varied proprietary portfolio and substantial alliances with biopharmaceutical industry leaders, including Sanofi, Bristol-Myers Squibb, Novo Nordisk A/S, and a multi-product collaboration with AstraZeneca.