(asparaginase) for Injection, Intravenous or Intramuscular Use
Elspar (asparaginase) contains the enzyme L-asparagine amidohydrolase, type EC-2, derived from Escherichia coli. Elspar activity is expressed in terms of International Units according to the recommendation of the International Union of Biochemistry. One International Unit of asparaginase is defined as that amount of enzyme required to generate 1 μmol of ammonia per minute at pH 7.3 and 37°C. The specific activity of Elspar is at least 225 International Units per milligram of protein.
Elspar is provided as a sterile, white lyophilized plug or powder. Each vial contains 10,000 International Units of asparaginase and 80 mg of mannitol.
Elspar is indicated as a component of a multi-agent chemotherapeutic regimen for the treatment of patients with acute lymphoblastic leukemia (ALL).
DOSAGE AND ADMINISTRATION
The recommended dose of Elspar is 6,000 International Units/m² intramuscularly (IM) or intravenously (IV) three times a week.
Instructions for Administration
W hen Elspar is administered IM, the volume at a single injection site should be limited to 2 mL. If a volume greater than 2 mL is to be administered, two injection sites should be used. Discard unused portion.
W hen administered IV, give Elspar over a period of not less than thirty minutes through the side arm of an infusion of Sodium Chloride Injection or Dextrose Injection 5% (D5W). Discard unused portion.
Preparation and Handling Precautions
For IM administration, reconstitute Elspar by adding 2 mL Sodium Chloride Injection to the 10,000 unit vial. W ithdraw volume of reconstituted Elspar containing calculated dose into sterile syringe. The reconstituted solution contains 5,000 international units (IU)/mL.
For IV administration, reconstitute Elspar by adding 5 mL Sterile W ater for Injection or Sodium Chloride Injection to the 10,000 unit vial. W ithdraw volume of reconstituted Elspar containing calculated dose into sterile syringe. The reconstituted solution contains 2,000 IU/mL.
Use reconstituted Elspar within eight hours.
Parenteral drug products should be inspected visually for particulate matter, cloudiness or discoloration prior to administration, whenever solution and container permit. If any of these are present, discard the solution. However, occasionally, a very small number of gelatinous fiber-like particles may develop on standing. Filtration through a 5.0 micron filter during administration will remove the particles with no resultant loss in potency.
Dosage Forms And Strengths
10,000 International Units as lyophilized powder in single-use vial.
10,000 International Units as lyophilized powder in single dose vial individually packaged in a carton.
Storage and Handling
Keep vials refrigerated at 2-8°C (36-46°F).
Elspar does not contain a preservative. Store unused, reconstituted solution at 2-8°C (36-46°F) and discard after eight hours, or sooner if it becomes cloudy.
Lundbeck, Deerfield, IL 60015, U.S.A. Revised: July 2013
The following serious adverse reactions occur with Elspar treatment [see WARNINGS AND PRECAUTIONS]:
- Anaphylaxis and serious allergic reactions
- Serious thrombosis
- Glucose intolerance
- Hepatotoxicity and abnormal liver function
- Posterior Reversible Encephalopathy Syndrome (PRES)
- Risk of Medication Errors
The most common adverse reactions with Elspar are allergic reactions (including anaphylaxis), hyperglycemia, pancreatitis, central nervous system (CNS) thrombosis, coagulopathy, hyperbilirubinemia, and elevated transaminases.
Clinical Trials and Post-Marketing Experience
The adverse reactions included in this section were identified in single-arm clinical trials in which Elspar was administered as part of a multi-agent regimen or from spontaneous post-marketing reports or published literature.
Because these adverse events were identified in clinical trials that were not designed to isolate the adverse effects of Elspar or were reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
Serious Adverse Reactions
Anaphylaxis and serious allergic reactions. Allergic reactions have occurred with the first dose and with subsequent doses of Elspar. The risk of serious allergic reactions appears to be higher in patients with prior exposure to Elspar or other Escherichia coli-derived L-asparaginases.
Serious thrombosis, including sagittal sinus thrombosis
Pancreatitis, in some cases fulminant or fatal
Glucose intolerance, in some cases irreversible
Hepatotoxicity, in some cases fatal, can occur.
Central Nervous System effects including coma, seizures, and hallucinations.
Common Adverse Reactions
Azotemia, liver function abnormalities, including hyperbilirubinemia, and elevated transaminases.
As with all therapeutic proteins, there is a potential for immunogenicity, defined as development of binding and/or neutralizing antibodies to the product.
Elspar is a bacterial protein and can elicit antibodies in patients treated with the drug. In 2 prospectively designed clinical trials (N=59 and 24), approximately one quarter of the patients developed antibodies that bound to Elspar as measured by enzyme-linked immunosorbent assays (ELISA). Clinical hypersensitivity reactions to Elspar in studies were common ranging from 32.5% to 75%. In these studies, concomitant medications and dosing schedules varied. Patients with hypersensitivity reactions were more likely to have antibodies than those without hypersensitivity reactions. Hypersensitivity reactions have been associated with increased clearance of Elspar. Incidence of antibody formation was lower upon first administration of Elspar than second administration. The frequency of antibody formation in adults relative to children is unknown. There is insufficient information to comment on neutralizing antibodies; however, higher levels of antibody correlated with a decrease in asparaginase activity.
The detection of antibody formation is highly dependent on the sensitivity and specificity of the assay, and the observed incidence of antibody positivity in an assay may be influenced by several factors including sample handling, concomitant medications and underlying disease. Therefore, comparison of the incidence of antibodies to Elspar with the incidence of antibodies to other products may be misleading.
No formal drug interaction studies between Elspar and other drugs have been performed.
Included as part of the PRECAUTIONS section.
Anaphylaxis and Serious Allergic Reactions
Serious allergic reactions can occur in patients receiving Elspar. The risk of serious allergic reactions is higher in patients with prior exposure to Elspar or other Escherichia coli-derived Lasparaginases. Observe patients for one hour after administration of Elspar in a setting with resuscitation equipment and other agents necessary to treat anaphylaxis (for example, epinephrine, oxygen, intravenous steroids, antihistamines). Discontinue Elspar in patients with serious allergic reactions.
Pancreatitis, in some cases fulminant or fatal, can occur in patients receiving Elspar. Evaluate patients with abdominal pain for evidence of pancreatitis. Discontinue Elspar in patients with pancreatitis.
Glucose intolerance can occur in patients receiving Elspar. In some cases, glucose intolerance is irreversible. Cases of diabetic ketoacidosis have been reported. Monitor serum glucose.
Increased prothrombin time, increased partial thromboplastin time, and hypofibrinogenemia can occur in patients receiving Elspar. CNS hemorrhages have been observed. Monitor coagulation parameters at baseline and periodically during and after treatment. Initiate treatment with fresh-frozen plasma to replace coagulation factors in patients with severe or symptomatic coagulopathy.
Hepatotoxicity and Abnormal Liver Function
Fulminant hepatic failure occurs. Hepatotoxicity and abnormal liver function, including elevations of AST (SGOT), ALT (SGPT), alkaline phosphatase, bilirubin (direct and indirect), and depression of serum albumin, and plasma fibrinogen can occur. Fatty changes in the liver have been documented on biopsy. Evaluate hepatic enzymes and bilirubin pretreatment and periodically during treatment.
Patients treated with Elspar, in a combination with other chemotherapeutic agents, have been reported to develop posterior reversible encephalopathy syndrome (PRES). PRES is a neurological disorder with clinical symptoms of headache, seizures, visual disturbances, altered mental status, and hypertension. Symptoms can be nonspecific, and diagnosis requires confirmation by radiological procedures. Interrupt use of Elspar if PRES is suspected or diagnosed. Control blood pressure promptly and monitor closely for seizure activity.
Risk of Medication Errors
Medication errors involving Elspar have occurred. In particular, different formulations and routes of administration (intramuscular and intravenous) of asparaginase have been interchanged inappropriately, which may result in subtherapeutic blood levels of asparaginase or additional toxicity related to an overdose. Confirm the formulation of asparaginase prior to administration. Do not interchange Elspar with Erwinia asparaginase or pegylated E. coliasparaginase [polyethylene glycol (PEG) asparaginase].
Carcinogenesis, Mutagenesis, Impairment of Fertility
No long-term carcinogenicity studies in animals have been performed with Elspar. No relevant studies addressing mutagenic potential have been conducted. Elspar did not exhibit a mutagenic effect when tested against Salmonella typhimurium strains in the Ames assay. No studies have been performed on impairment of fertility.
Use In Specific Populations
Pregnancy Category C
In mice and rats Elspar has been shown to retard the weight gain of mothers and fetuses when given in doses of more than 1000 International Units/kg (approximately equivalent to the recommended human dose, when adjusted for total body surface area). Resorptions, gross abnormalities and skeletal abnormalities were observed. The intravenous administration of 50 or 100 International Units/kg (approximately equivalent to 10 to 20% of the recommended human dose, when adjusted for total body surface area) to pregnant rabbits on Day 8 and 9 of gestation resulted in dose dependent embryotoxicity and gross abnormalities. There are no adequate and well-controlled studies in pregnant women. Elspar should be given to a pregnant woman only if clearly needed.
It is not known whether Elspar is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from ELSPAR, a decision should be made to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.
[See Clinical Studies]
Clinical studies of Elspar did not include sufficient numbers of subjects aged 65 and older to determine whether they respond differently from younger subjects.
Mechanism of Action
The mechanism of action of Elspar is thought to be based on selective killing of leukemic cells due to depletion of plasma asparagine. Some leukemic cells are unable to synthesize asparagine due to a lack of asparagine synthetase and are dependent on an exogenous source of asparagine for survival. Depletion of asparagine, which results from treatment with the enzyme Lasparaginase, kills the leukemic cells. Normal cells, however, are less affected by the depletion due to their ability to synthesize asparagine.
The relationship between asparaginase activity and asparagine levels has been studied in clinical trials. In previously untreated, standard-risk ALL patients treated with native asparaginase in whom plasma enzyme activity was greater than 0.1 International Units/mL, plasma asparagine levels decreased from a pretreatment average level of 41 μM to less than 3 μM. In this study, cerebrospinal fluid asparagine levels in patients treated with asparaginase decreased from 2.8 μM (pretreatment) to 1.0 μM and 0.3 μM at day 7 and day 28 of induction, respectively.
In a study in patients with metastatic cancer and leukemia, daily intravenous administration of L-asparaginase resulted in a cumulative increase in plasma levels. Plasma half-life varied from 8 to 30 hours. Apparent volume of distribution was slightly greater than the plasma volume. Asparaginase levels in cerebrospinal fluid were less than 1% of concurrent plasma levels.
In a study in which patients with leukemia and metastatic cancer received intramuscular L-asparaginase, peak plasma levels of asparaginase were reached 14 to 24 hours after dosing. Plasma half-life was 34 to 49 hours.
Edema and necrosis of pancreatic islets were observed in rabbits following a single, intravenous injection of 12,500 to 50,000 International Units Elspar/kg (approximately equivalent to 25 to 100fold the recommended human dose, when adjusted for total body surface area). These changes were not reflective of pancreatitis, and were not observed in rabbits following a single intravenous injection of 1000 International Units/kg (approximately equivalent to two times the recommended human dose, when adjusted for total body surface area).
Elspar was evaluated in an open-label, multi-center, single-arm study in which 823 patients less than 16 years of age with previously untreated acute lymphoblastic or acute undifferentiated leukemia received Elspar as a component of multi-agent chemotherapy for induction of first remission. Elspar was administered at a dose of 6,000 International Units/m² intramuscularly 3 times a week for a total of 9 doses. Of 815 evaluable patients, 758 (93%) achieved a complete remission. In a previous study, in a similar patient population, which utilized an initial induction chemotherapy regimen containing the same agents without Elspar, 429 of 499 (86%) patients achieved a complete remission.
Advise patients to contact health care professional immediately to report any of the following:
- swelling of the face, arms or legs, with or without pain in the arm or leg
- acute difficulty in breathing/shortness of breath
- severe headache, seizures, change in mental status
- new onset chest pain
- severe abdominal pain
Advise patients to inform their healthcare professional of:
- excessive thirst or an increase in the volume or frequency of urination
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.