A phase 1 trial of vadastuximab talirine as monotherapy in patients with CD33-positive acute myeloid leukemia

Eytan M. Stein, Roland B. Walter, Harry P. Erba, Amir T. Fathi, Anjali S. Advani, Jeffrey E. Lancet, Farhad Ravandi, Tibor Kovacsovics, Daniel J. DeAngelo, Dale Bixby, Stefan Faderl, Anand P. Jillella, Phoenix A. Ho, Megan M. O'Meara, Baiteng Zhao, Charles Biddle-Snead, Anthony S. Stein

Research output: Contribution to journalArticlepeer-review

99 Scopus citations


Vadastuximab talirine (SGN-CD33A, 33A) is an antibody-drug conjugate consisting of pyrrolobenzodiazepine dimers linked to a monoclonal antibody targeting CD33, which is expressed in the majority of acute myeloid leukemia (AML) patients. This phase 1 study evaluated the safety, pharmacokinetics, and preliminary activity of vadastuximab talirine and determined the recommended monotherapy dose in patients with relapsed or refractory AML. Additional expansion cohorts tested vadastuximab talirine in specific subpopulations of relapsed AML, and in a cohort of older, treatment-naive patients. Patients received vadastuximab talirine IV on day 1 (5-60 μg/kg) or on days 1 and 4 (20 μg/kg) of 21-day cycles. A total of 131 patients (median age, 73 years [range, 26-89 years]) had intermediate I-II (48%) or adverse (34%) risk by European LeukemiaNet classification; 50% of patients had underlying myelodysplasia. Two dose-limiting toxicities (grade 2 pulmonary embolism and grade 4 hypocellular marrow) occurred during dose finding. Most adverse events (AEs) were consistent with myelosuppression; nonhematologic AEs included fatigue, nausea, and diarrhea. The 30-day mortality was 8%. At the recommended monotherapy dose of 40 mg/kg, the complete remission + CRi rate was 28% (5 of 18 patients); 50% of patients who responded achieved minimal residual disease negativity. In patients across dose levels who achieved CR or CRi, the median time to full count recovery was 6.4 weeks for neutrophils (≥1000/μL) and 10.6 weeks for platelets (≥100 x 109/L). Vadastuximab talirine demonstrates activity and a tolerable safety profile as a single agent in patients with AML. The recommended monotherapy dose of vadastuximab talirine is 40 mg/kg. This trial was registered at www.clinicaltrials.gov as # NCT01902329.

Original languageEnglish (US)
Pages (from-to)387-396
Number of pages10
Issue number4
StatePublished - Jan 25 2018
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology


Dive into the research topics of 'A phase 1 trial of vadastuximab talirine as monotherapy in patients with CD33-positive acute myeloid leukemia'. Together they form a unique fingerprint.

Cite this