Innate Pharma SA announced that the first patient was dosed in a Phase 1/2 clinical trial (NCT05086315), evaluating IPH6101/SAR443579, the first NKp46/CD16-based NK cell engager, 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). The purpose of the dose escalation and dose expansion study, which is sponsored by Sanofi, is to evaluate the safety, pharmacokinetics, pharmacodynamics and initial clinical activity of IPH6101/SAR443579, Innate’s lead ANKETTM asset, in various CD123-expressing hematological malignancies. This trial is supported by positive pre-clinical results presented at the Society for Immunotherapy of Cancer (SITC) 2021 Congress, which demonstrated the CD123-targeted molecule’s potent antitumor activity against AML, including evidence supporting greater anti-leukemia activity compared with an anti-CD123 antibody. IPH6101/SAR443579 had sustained pharmacodynamic effects in non-human primates, combining efficient depletion of CD123-expressing cells with minor systemic cytokine release in comparison to T-cell engagers. As expected, it also had a favorable safety profile.