Overview
11 DESCRIPTION Pegaspargase is a conjugate of monomethoxypolyethylene glycol (mPEG) and L-asparaginase (L-asparagine amidohydrolase), an asparagine specific enzyme. L-asparaginase is a tetrameric enzyme that is produced endogenously by E. coli and consists of identical 34.5 kDa subunits.
Mechanism of Action
12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action L-asparaginase is an enzyme that catalyzes the conversion of the amino acid L-asparagine into aspartic acid and ammonia. The pharmacological effect of ONCASPAR is thought to be based on the killing of leukemic cells due to depletion of plasma asparagine. Leukemic cells with low expression of asparagine synthetase have a reduced ability to synthesize asparagine, and therefore depend on an exogenous source of asparagine for survival. 12.2 Pharmacodynamics Pharmacodynamic activity was assessed through serial measurements of asparagine in sera and cerebrospinal fluid (CSF).
Indications
- 1 INDICATIONS AND USAGE ONCASPAR is an asparagine specific enzyme indicated as a component of a multi-agent chemotherapeutic regimen for treatment of pediatric and adult patients with: First-line acute lymphoblastic leukemia ( 1.1 ) Acute lymphoblastic leukemia and hypersensitivity to asparaginase ( 1.2 ) 1.1 First Line Acute Lymphoblastic Leukemia (ALL) ONCASPAR ® is indicated as a component of a multi-agent chemotherapeutic regimen for the first-line treatment of pediatric and adult patients with ALL. 1.
Common Doses
- 2 mL
- 100 mL
Dosage
2 DOSAGE AND ADMINISTRATION Administered intramuscularly or intravenously no more frequently than every 14 days. ( 2.1 ) Patients ages 21 years and younger: 2,500 International Units/m 2 . ( 2.1 ) Patients ages over 21 years: 2,000 International Units/m 2 . ( 2.1 ) For intramuscular administration, limit the volume at a single injection site to 2 mL; if greater than 2 mL, use multiple injection sites. ( 2.3 ) For intravenous administration, give over a period of 1 to 2 hours in 100 mL of 0.
Contraindications
- 4 CONTRAINDICATIONS ONCASPAR is contraindicated in patients with a: History of serious hypersensitivity reactions, including anaphylaxis, to ONCASPAR or to any of the excipients [see Warnings and Precautions (5.1) ] . History of serious thrombosis with prior L-asparaginase therapy [see Warnings and Precautions (5.2) ] . History of pancreatitis, including pancreatitis related to prior L-asparaginase therapy [see Warnings and Precautions (5.3) ] . History of serious hemorrhagic events with prior L-asparaginase therapy [see Warnings and Precautions (5.5) ] .
Side Effects
- 6 ADVERSE REACTIONS The following clinically significant adverse reactions are described elsewhere in the labeling: Anaphylaxis and serious hypersensitivity reactions [see Warnings and Precautions (5.1) ] Thrombosis [see Warnings and Precautions (5.2) ] Pancreatitis [see Warnings and Precautions (5.3) ] Glucose intolerance [see Warnings and Precautions (5.4) ] Hemorrhage [see Warnings and Precautions (5.5) ] Hepatotoxicity, including VOD [see Warnings and Precautions (5.
Interactions
- 7 DRUG INTERACTIONS 7.1 Glucocorticoids Pegaspargase may increase the risk of glucocorticoid-induced toxicities, including osteonecrosis through a potential increase in exposure of dexamethasone [see Adverse Reactions (6.3) ] .