Unveiling the Correlation between gemtuzumab-ozogamicin Efficacy and CD33+ Expression in AML Primary Samples Using the Novel AML VitroScreen

Acute myeloid leukemia (AML) poses a significant therapeutic challenge, with a rising incidence in recent times. This clonal hematopoietic disorder of progenitor and stem cells exhibits aggressive behavior, and despite initial remission, recurrence is common. The conventional shift from chemotherapy to monoclonal antibodies and antibody-drug conjugates (ADCs) has been hindered by the absence of AML-specific antigens. Notably, CD33, expressed strongly in 80–90% of AML cells, has become a target for gemtuzumab-ozogamicin (Mylotarg), the sole FDA-approved ADC for AML treatment.
While advancements in understanding AML molecular mechanisms have influenced clinical approaches, the lack of clinically representative models hinders therapeutic progress. Existing models, both in vivo and ex vivo, struggle to capture the heterogeneity and complexity of AML.

Addressing this, we present our proprietary assay, Champions’ AML VitroScreen, designed for testing therapeutic candidates in primary AML samples. Our diverse bank of deeply characterized AML samples encompasses multiple subtypes, allowing the evaluation of therapeutic responses through cell viability, proliferation, and clonal composition analyses.