Gemtuzumab ozogamicin (GO) is an immunoconjugate that binds to CD33 on the surface of acute myeloid leukaemia (AML) blasts and, after internalisation, releases a cytotoxic drug, calicheamicin. GO is approved by the US Food and Drug Administration for the treatment of CD33-positive AML at first relapse in patients 60 years and older who are not candidates for other cytotoxic therapy. GO as a sin...

Gemtuzumab ozogamicin (GO) is a recombinant humanized immunoglobulin G4 anti-cluster of differentiation (CD)33 monoclonal antibody conjugated to N-acetyl-γ calicheamicin dimethylhydrazide, a naturally potent antibiotic. It has been introduced for the treatment of acute promyelocytic leukemia (APL), since large quantities of CD33 are commonly expressed on the surface of APL cells. The present st...

We performed a retrospective analysis of 9 patients with acute myeloid leukemia (AML) treated with gemtuzumab ozogamicin (GO) plus cytarabine as a salvage regimen (GO reinduction) for patients who did not achieve complete remission (CR) after the first cycle of induction chemotherapy or at first relapse. Cases of AML secondary to myelodysplastic syndrome or myeloproliferative disorder were incl...

Antibody-drug conjugates (ADCs) combine cytotoxic chemotherapy and antibody specificity. There are 4 components of ADC technology: the cancer, or target, antigen; the antibody to that target; the linker that connects the drug to the antibody; and the drug itself. The antibody directs the cytotoxic agent to the tumor cell, thereby diminishing the side effect profile of the cytotoxic agent and en...

CD33 is a myeloid differentiation antigen with endocytic properties. It is broadly expressed on acute myeloid leukemia (AML) blasts and, possibly, some leukemic stem cells and has therefore been exploited as target for therapeutic antibodies for many years. The improved survival seen in many patients when the antibody-drug conjugate, gemtuzumab ozogamicin, is added to conventional chemotherapy ...

Targeting CD33 or CD45 is currently exploited for immunotherapy of acute myeloid leukemia (AML). Gemtuzumab ozogamicin (GO), an immunoconjugate of an anti-CD33 antibody that facilitates cellular uptake of a toxic calicheamicin-gamma(1) derivative, induces complete remissions in a subset of patients with AML. We herein tested whether simultaneous targeting of CD45 could improve GO cytotoxicity a...