Final report of the efficacy and safety of gemtuzumab ozogamicin (Mylotarg) in patients with CD33-positive acute myeloid leukemia in first recurrence

Cancer. 2005 Oct 1;104(7):1442-52. doi: 10.1002/cncr.21326.


Background: In this study, the authors analyzed the efficacy and safety of gemtuzumab ozogamicin (GO) (Mylotarg), an antibody-targeted chemotherapy for CD33-positive acute myeloid leukemia (AML).

Methods: Patients with CD33-positive AML in first recurrence were entered in 3 open-label, single-arm, Phase II studies. Patients received monotherapy with GO 9 mg/m(2) as a 2-hour intravenous infusion in 2 doses separated by 2 weeks. Patients were evaluated for remission, survival, and treatment-emergent adverse events.

Results: Two hundred seventy-seven patients (median age, 61 yrs) were treated with GO, and 71 patients (26%) achieved remission, which was defined as < or = 5% blasts in the bone marrow without leukemic blasts in the peripheral blood, neutrophil recovery to > or = 1500/microL, hemoglobin > or = 9 g/dL, and independence from red blood cell and platelet transfusions. Complete remission (CR) with platelet recovery (> or = 100,000/microL) or without full platelet recovery (< 100,000/microL) (CRp) was observed in 35 patients (13%) and 36 patients (13%), respectively. The median recurrence-free survival was 6.4 months for patients who achieved CR and 4.5 months for patients who achieved CRp. Although expected incidences of Grade 3 or 4 neutropenia (98%) and thrombocytopenia (99%) were observed, the incidence of Grade 3 or 4 sepsis (17%) and pneumonia (8%) was relatively low. Grade 3 or 4 hyperbilirubinemia and hepatic aspartate aminotransferase and alanine aminotransferase elevations were reported in 29%, 18%, and 9% of patients, respectively; 0.9% of patients who did not undergo prior or subsequent hematopoietic stem cell transplantation developed hepatic venoocclusive disease after GO treatment.

Conclusions: When it was administered to patients with CD33-positive AML in first recurrence, single-agent GO induced a 26% remission rate with a generally acceptable safety profile.

Publication types

  • Comparative Study
  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Aminoglycosides / administration & dosage*
  • Antibodies, Monoclonal / administration & dosage*
  • Antibodies, Monoclonal, Humanized
  • Antigens, CD / immunology*
  • Antigens, Differentiation, Myelomonocytic / immunology*
  • Clinical Trials, Phase II as Topic
  • Dose-Response Relationship, Drug
  • Drug Administration Schedule
  • Evaluation Studies as Topic
  • Female
  • Follow-Up Studies
  • Gemtuzumab
  • Humans
  • Leukemia, Myeloid, Acute / diagnosis
  • Leukemia, Myeloid, Acute / drug therapy*
  • Leukemia, Myeloid, Acute / immunology
  • Leukemia, Myeloid, Acute / mortality*
  • Male
  • Maximum Tolerated Dose
  • Middle Aged
  • Recurrence
  • Risk Assessment
  • Severity of Illness Index
  • Sialic Acid Binding Ig-like Lectin 3
  • Single-Blind Method
  • Survival Rate
  • Treatment Outcome


  • Aminoglycosides
  • Antibodies, Monoclonal
  • Antibodies, Monoclonal, Humanized
  • Antigens, CD
  • Antigens, Differentiation, Myelomonocytic
  • CD33 protein, human
  • Sialic Acid Binding Ig-like Lectin 3
  • Gemtuzumab