Acute Myelogenous Leukemia Medication

  • Author: Karen Seiter, MD; Chief Editor: Emmanuel C Besa, MD   more...
 
Updated: Mar 9, 2012
 

Medication Summary

Medications used for the treatment of acute myelogenous leukemia (AML) cause severe bone marrow depression. Only physicians specifically trained in their use should use these agents. In addition, access to appropriate supportive care (ie, blood banking) is required.

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Antineoplastics

Class Summary

Antineoplastic agents are used for induction or consolidation therapy. These agents inhibit cell growth and differentiation. They include cytarabine, daunorubicin, idarubicin, and mitoxantrone.

Azacitidine (Vidaza)

 

Azacitidine is a pyrimidine nucleoside analog of cytidine. It interferes with nucleic acid metabolism. It exerts antineoplastic effects by DNA hypomethylation and direct cytotoxicity on abnormal hematopoietic bone marrow cells. Hypomethylation may restore normal function to genes critical for cell differentiation and proliferation. Nonproliferative cells are largely insensitive to azacitidine. It is indicated to treat myelodysplastic syndromes (MDSs) and is FDA approved for all 5 MDS subtypes.

Cytarabine (Cytosar-U)

 

Cytarabine is an antimetabolite specific for cells in the S-phase of the cell cycle. It acts through inhibition of DNA polymerase and cytosine incorporation into DNA and RNA.

Daunorubicin (Cerubidine)

 

Daunorubicin is a topoisomerase-II inhibitor. It inhibits DNA and RNA synthesis by intercalating between DNA base pairs.

Idarubicin (Idamycin)

 

Idarubicin is a topoisomerase-II inhibitor. It inhibits cell proliferation by inhibiting DNA and RNA polymerase.

Mitoxantrone (Novantrone)

 

Mitoxantrone inhibits cell proliferation by intercalating DNA. It inhibits topoisomerase II.

Arsenic trioxide (Trisenox)

 

Arsenic trioxide is used in patients with relapsed acute promyelocytic leukemia (APL). Its mechanism of action is not completely understood. Arsenic trioxide causes morphologic changes and DNA fragmentation that are characteristic of apoptosis in NB4 human promyelocytic leukemia cells in vitro. Arsenic trioxide also causes damage or degradation of the fusion protein PML-RAR alpha.

Fludarabine (Fludara)

 

Fludarabine contains fludarabine phosphate, a fluorinated nucleotide analog of the antiviral agent vidarabine, 9-b-D-arabinofuranosyladenine (ara-A), that enters the cell and is phosphorylated to form the active metabolite 2-fluoro-ara-ATP, which inhibits DNA synthesis. It is also incorporated into RNA, causing inhibition of RNA and protein synthesis; however, its primary effect may result from activation of apoptosis. It is also relatively resistant to deamination by adenosine deaminase.

The dosage may be decreased or delayed based on evidence of hematologic or nonhematologic toxicity. Physicians should consider delaying or discontinuing the drug if neurotoxicity occurs. The optimal duration of treatment is not clearly established. It is recommended that 3 additional cycles of fludarabine be administered following the achievement of maximal response, and then the drug should be discontinued.

Cyclophosphamide

 

Cyclophosphamide is a cyclic polypeptide that suppresses some humoral activity. It is chemically related to nitrogen mustards and is activated in the liver to its active metabolite, 4-hydroxycyclophosphamide, which alkylates the target sites in susceptible cells in an all-or-none type of reaction. As an alkylating agent, the mechanism of action of the active metabolites may involve cross-linking of DNA, which may interfere with the growth of normal and neoplastic cells.

It is biotransformed by cytochrome P450 system to hydroxylated intermediates that break down to active phosphoramide mustard and acrolein. The interaction of phosphoramide mustard with DNA is considered cytotoxic.

When cyclophosphamide is used in autoimmune diseases, the mechanism of action is thought to involve immunosuppression due to destruction of immune cells via DNA cross-linking.

In high doses, it affects B cells by inhibiting clonal expansion and suppression of the production of immunoglobulins. With long-term, low-dose therapy, it affects T-cell functions.

Cladribine (Leustatin)

 

Cladribine is a synthetic antineoplastic agent for continuous IV infusion. The enzyme deoxycytidine kinase phosphorylates this compound into an active 5+-triphosphate derivative, which, in turn, brakes DNA strands and inhibits DNA synthesis. It disrupts cell metabolism, causing death to resting and dividing cells.

Decitabine (Dacogen)

 

Decitabine is a hypomethylating agent believed to exert antineoplastic effects by incorporating into DNA and inhibiting methyltransferase, resulting in hypomethylation. Hypomethylation in neoplastic cells may restore normal function to genes critical for cellular control of differentiation and proliferation. It is indicated for myelodysplastic syndromes (MDSs), including previously treated and untreated, de novo, and secondary MDSs of all French-American-British (FAB) subtypes (ie, refractory anemia, refractory anemia with ringed sideroblasts, refractory anemia with excess blasts, refractory anemia with excess blasts in transformation, chronic myelomonocytic leukemia) and International Prognostic Scoring System (IPSS) groups intermediate-1 risk, intermediate-2 risk, and high risk.

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Contributor Information and Disclosures
Author

Karen Seiter, MD  Professor, Department of Internal Medicine, Division of Oncology/Hematology, New York Medical College

Karen Seiter, MD is a member of the following medical societies: American Association for Cancer Research, American College of Physicians, and American Society of Hematology

Disclosure: Novartis Honoraria Speaking and teaching; Novartis Consulting fee Speaking and teaching; Eisai Honoraria Speaking and teaching; Celgene Honoraria Speaking and teaching

Specialty Editor Board

Clarence Sarkodee-Adoo, MD  Consulting Staff, Department of Bone Marrow Transplantation, City of Hope Samaritan BMT Program

Disclosure: Takeda Millenium Honoraria Speaking and teaching

Francisco Talavera, PharmD, PhD  Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Medscape Salary Employment

Ronald A Sacher, MB, BCh, MD, FRCPC  Professor, Internal Medicine and Pathology, Director, Hoxworth Blood Center, University of Cincinnati Academic Health Center

Ronald A Sacher, MB, BCh, MD, FRCPC is a member of the following medical societies: American Association for the Advancement of Science, American Association of Blood Banks, American Clinical and Climatological Association, American Society for Clinical Pathology, American Society of Hematology, College of American Pathologists, International Society of Blood Transfusion, International Society on Thrombosis and Haemostasis, and Royal College of Physicians and Surgeons of Canada

Disclosure: Glaxo Smith Kline Honoraria Speaking and teaching; Talecris Honoraria Board membership

Chief Editor

Emmanuel C Besa, MD  Professor, Department of Medicine, Division of Hematologic Malignancies, Kimmel Cancer Center, Jefferson Medical College of Thomas Jefferson University

Emmanuel C Besa, MD is a member of the following medical societies: American Association for Cancer Education, American College of Clinical Pharmacology, American Federation for Medical Research, American Society of Clinical Oncology, American Society of Hematology, and New York Academy of Sciences

Disclosure: Nothing to disclose.

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Table 1. Immunophenotyping of AML Cells
MarkerLineage
CD13Myeloid
CD33Myeloid
CD34Early precursor
HLA-DRPositive in most AML, negative in APL
CD11bMature monocytes
CD14Monocytes
CD41Platelet glycoprotein IIb/IIIa complex
CD42aPlatelet glycoprotein IX
CD42bPlatelet glycoprotein Ib
CD61Platelet glycoprotein IIIa
Glycophorin AErythroid
TdTUsually indicates acute lymphocytic leukemia, however, may be positive in M0 or M1
CD11cMyeloid
CD117 (c-kit)Myeloid/stem cell
Table 2. Common Cytogenetic Abnormalities in AML
AbnormalityGenes InvolvedMorphologyResponse
t(8;21)(q22;q22)AML/ETOM2Good
inv(16)(p13;q22)CBFb/MYH11M4eoGood
NormalMultipleVariesIntermediate
-7MultipleVariesPoor
-5MultipleVariesPoor
+8MultipleVariesIntermediate-poor
11q23MLLVariesIntermediate-poor
MiscellaneousMultipleVariesIntermediate-poor
Multiple complex*MultipleVariesPoor
* Refers to 3-5 different cytogenetic abnormalities, depending on the classification used.
Table 3. Cytogenetic Abnormalities in APL
TranslocationGenes InvolvedAll-Trans-Retinoic Acid Response
t(15;17)(q21;q11)PML/RARaYes
t(11;17)(q23;q11)PLZF/RARaNo
t(11;17)(q13;q11)NuMA/RARaYes
t(5;17)(q31;q11)NPM/RARaYes
t(17;17)stat5b/RARaUnknown
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