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Journal Article
Review
Investigational CD33-targeted therapeutics for acute myeloid leukemia.
Expert Opinion on Investigational Drugs 2018 April
INTRODUCTION: There is long-standing interest in drugs targeting the myeloid differentiation antigen CD33 in acute myeloid leukemia (AML). Positive results from randomized trials with the antibody-drug conjugate (ADC) gemtuzumab ozogamicin (GO) validate this approach. Partly stimulated by the success of GO, several CD33-targeted therapeutics are currently in early phase testing.
AREAS COVERED: CD33-targeted therapeutics in clinical development include Fc-engineered unconjugated antibodies (BI 836858 [mAb 33.1]), ADCs (SGN-CD33A [vadastuximab talirine], IMGN779), radioimmunoconjugates (225 Ac-lintuzumab), bi- and trispecific antibodies (AMG 330, AMG 673, AMV564, 161533 TriKE fusion protein), and chimeric antigen receptor (CAR)-modified immune effector cells. Besides limited data on 225 Ac-lintuzumab showing modest single-agent activity, clinical data are so far primarily available for SGN-CD33A. SGN-CD33A has single-agent activity and has shown encouraging results when combined with an azanucleoside or standard chemotherapeutics. However, concerns about toxicity to the liver and normal hematopoietic cells - the latter leading to early termination of a phase 3 trial - have derailed the development of SGN-CD33A, and its future is uncertain.
EXPERT OPINION: Early results from a new generation of CD33-targeted therapeutics are anticipated in the next 2-3 years. Undoubtedly, re-approval of GO in 2017 has changed the landscape and rendered clinical development for these agents more challenging.
AREAS COVERED: CD33-targeted therapeutics in clinical development include Fc-engineered unconjugated antibodies (BI 836858 [mAb 33.1]), ADCs (SGN-CD33A [vadastuximab talirine], IMGN779), radioimmunoconjugates (225 Ac-lintuzumab), bi- and trispecific antibodies (AMG 330, AMG 673, AMV564, 161533 TriKE fusion protein), and chimeric antigen receptor (CAR)-modified immune effector cells. Besides limited data on 225 Ac-lintuzumab showing modest single-agent activity, clinical data are so far primarily available for SGN-CD33A. SGN-CD33A has single-agent activity and has shown encouraging results when combined with an azanucleoside or standard chemotherapeutics. However, concerns about toxicity to the liver and normal hematopoietic cells - the latter leading to early termination of a phase 3 trial - have derailed the development of SGN-CD33A, and its future is uncertain.
EXPERT OPINION: Early results from a new generation of CD33-targeted therapeutics are anticipated in the next 2-3 years. Undoubtedly, re-approval of GO in 2017 has changed the landscape and rendered clinical development for these agents more challenging.
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