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Ibritumomab Tiuxetan

FDA Drug Information • Also known as: Zevalin

Brand Names
Zevalin
Dosage Form
KIT
Product Type
HUMAN PRESCRIPTION DRUG

⚠ Boxed Warning (Black Box)

WARNING: SERIOUS INFUSION REACTIONS, PROLONGED AND SEVERE CYTOPENIAS, and SEVERE CUTANEOUS AND MUCOCUTANEOUS REACTIONS Serious Infusion Reactions: Deaths have occurred within 24 hours of rituximab infusion, an essential component of the Zevalin therapeutic regimen. These fatalities were associated with hypoxia, pulmonary infiltrates, acute respiratory distress syndrome, myocardial infarction, ventricular fibrillation, or cardiogenic shock. Most (80%) fatalities occurred with the first rituximab infusion [ see Warnings and Precautions ( 5.1 ) and Adverse Reactions ( 6.1 ) ] . Discontinue rituximab and Y-90 Zevalin infusions in patients who develop severe infusion reactions. Prolonged and Severe Cytopenias: Y-90 Zevalin administration results in severe and prolonged cytopenias in most patients. Do not administer Y-90 Zevalin to patients with ≥ 25% lymphoma marrow involvement and/or impaired bone marrow reserve [ see Warnings and Precautions ( 5.2 ) and Adverse Reactions ( 6.1 ) ]. Severe Cutaneous and Mucocutaneous Reactions: Severe cutaneous and mucocutaneous reactions, some fatal, can occur with the Zevalin therapeutic regimen. Discontinue rituximab and Y-90 Zevalin infusions in patients experiencing severe cutaneous or mucocutaneous reactions [ see Warnings and Precautions ( 5.3 ) and Adverse Reactions ( 6.2 ) ]. Dosing: The dose of Y-90 Zevalin should not exceed 32 mCi (1184 MBq) [ see Dosage and Administration ( 2.2 ) ]. WARNING: SERIOUS INFUSION REACTIONS, PROLONGED AND SEVERE CYTOPENIAS, and SEVERE CUTANEOUS AND MUCOCUTANEOUS REACTIONS See full prescribing information for complete boxed warning Serious Infusion Reactions, some fatal, may occur within 24 hours of rituximab infusion. ( 5.1 ) Prolonged and Severe Cytopenias occur in most patients. ( 5.2 ) Severe Cutaneous and Mucocutaneous Reactions, some fatal, reported with Zevalin therapeutic regimen. ( 5.3 , 6.2 ) Do not exceed 32 mCi (1184 MBq) of Y-90 Zevalin. ( 2.2 )

Description

11 DESCRIPTION Zevalin (ibritumomab tiuxetan) is the immunoconjugate resulting from a stable thiourea covalent bond between the monoclonal antibody ibritumomab and the linker-chelator tiuxetan [N-[2-bis(carboxymethyl) amino]-3-(p-isothiocyanatophenyl)-propyl]-[N-[2-bis(carboxymethyl)amino]-2- (methyl)-ethyl]glycine. This linker-chelator provides a high affinity, conformationally restricted chelation site for Yttrium-90. The approximate molecular weight of ibritumomab tiuxetan is 148 kD. The antibody moiety of Zevalin is ibritumomab, a murine IgG 1 kappa monoclonal antibody directed against the CD20 antigen. Ibritumomab tiuxetan is a clear, colorless, sterile, pyrogen-free, preservative-free solution that may contain translucent particles. Each single-use vial includes 3.2 mg of ibritumomab tiuxetan in 2 mL of 0.9% Sodium Chloride. Physical/Radiochemical Characteristics of Y-90 Yttrium-90 decays by emission of beta particles, with a physical half-life of 64.1 hours (2.67 days). The product of radioactive decay is non-radioactive Zirconium-90. The range of beta particles in soft tissue ( χ 90) is 5 mm. Radiation emission data for Y-90 are summarized in Table 5 . Table 5. Principal Y-90 Radiation Emission Data Radiation Mean % per Disintegration Mean Energy (keV) Beta minus 100 750-935 External Radiation The exposure rate for 1 mCi (37 MBq) of Y-90 is 8.3 x 10 -3 C/kg/hr (32 R/hr) at the mouth of an open Y-90 vial. To allow correction for physical decay of Y-90, the fractions that remain at selected intervals before and after the time of calibration are shown in Table 6 . Table 6. Physical Decay Chart: Y-90 Half-life 2.67 Days (64.1 Hours) Calibration Time (Hrs.) Fraction Remaining Calibration Time (Hrs.) Fraction Remaining -36 1.48 0 1.00 -24 1.30 1 0.99 -12 1.14 2 0.98 -8 1.09 3 0.97 -7 1.08 4 0.96 -6 1.07 5 0.95 -5 1.06 6 0.94 -4 1.04 7 0.93 -3 1.03 8 0.92 -2 1.02 12 0.88 -1 1.01 24 0.77 0 1.00 36 0.68

What Is Ibritumomab Tiuxetan Used For?

1 INDICATIONS AND USAGE Zevalin is a CD20-directed radiotherapeutic antibody administered as part of the Zevalin therapeutic regimen indicated for the treatment of adult patients with: relapsed or refractory, low-grade or follicular B-cell non-Hodgkin's lymphoma (NHL) ( 1.1 ). previously untreated follicular NHL who achieve a partial or complete response to first-line chemotherapy ( 1.2 ). 1.1 Relapsed or Refractory, Low-grade or Follicular NHL Zevalin is indicated for the treatment of adult patients with relapsed or refractory, low-grade or follicular B-cell non-Hodgkin's lymphoma (NHL). 1.2 Previously Untreated Follicular NHL Zevalin is indicated for the treatment of previously untreated follicular NHL in adult patients who achieve a partial or complete response to first-line chemotherapy.

Dosage and Administration

2 DOSAGE AND ADMINISTRATION Day 1 : Administer rituximab 250 mg/m 2 intravenous infusion. ( 2.2 ) Day 7, 8, or 9 : Administer rituximab 250 mg/m 2 intravenous infusion. ( 2.2 ) If platelets at least 150,000/mm 3 : Within 4 hours after rituximab infusion, administer 0.4 mCi/kg (14.8 MBq per kg) Y-90 Zevalin intravenous infusion. If platelets 100,000 to 149,000/mm 3 in relapsed or refractory patients: Within 4 hours after rituximab infusion, administer 0.3 mCi/kg (11.1 MBq per kg) Y-90 Zevalin intravenous infusion. 2.1 Recommended Dosing Schedule Administer the Zevalin therapeutic regimen as outlined below. Initiate the Zevalin therapeutic regimen following recovery of platelet counts to 150,000/mm 3 or more at least 6 weeks, but no more than 12 weeks, following the last dose of first-line chemotherapy. Only administer rituximab/Zevalin in facilities where immediate access to resuscitative measures is available. Overview of Dosing Schedule Zevalin Dosing Schedule 2.2 Zevalin Therapeutic Regimen Dosage and Administration Day 1: Premedicate with acetaminophen 650 mg orally and diphenhydramine 50 mg orally prior to rituximab infusion. Administer rituximab 250 mg/m 2 intravenously at an initial rate of 50 mg/hr. In the absence of infusion reactions, escalate the infusion rate in 50 mg/hr increments every 30 minutes to a maximum of 400 mg/hr. Do not mix or dilute rituximab with other drugs. Immediately stop the rituximab infusion for serious infusion reactions and discontinue the Zevalin therapeutic regimen [ see Boxed Warning and Warnings and Precautions ( 5.1 ) ]. Temporarily slow or interrupt the rituximab infusion for less severe infusion reactions. If symptoms improve, continue the infusion at one-half the previous rate. Day 7, 8 or 9: Premedicate with acetaminophen 650 mg orally and diphenhydramine 50 mg orally prior to rituximab infusion. Administer rituximab 250 mg/m 2 intravenously at an initial rate of 100 mg/hr. Increase rate by 100 mg/hr increments at 30 minute intervals, to a maximum of 400 mg/hr, as tolerated. If infusion reactions occurred during rituximab infusion on Day 1 of treatment, administer rituximab at an initial rate of 50 mg/hr and escalate the infusion rate in 50 mg/hr increments every 30 minutes to a maximum of 400 mg/hr. Administer Y-90 Zevalin injection through a free flowing intravenous line within 4 hours following completion of rituximab infusion. Use a 0.22 micron low-protein-binding in-line filter between the syringe and the infusion port. After infusion, flush the line with at least 10 mL of normal saline. If platelet count at least 150,000/mm 3 , administer Y-90 Zevalin over 10 minutes as an intravenous infusion at a dose of Y-90 0.4 mCi per kg (14.8 MBq per kg) actual body weight. If platelet count 100,000 to 149,000/mm 3 , in relapsed or refractory patients, administer Y-90 Zevalin over 10 minutes as an intravenous infusion at a dose of Y-90 0.3 mCi per kg (11.1 MBq per kg) actual body weight. Do not administer...

Side Effects (Adverse Reactions)

6 ADVERSE REACTIONS The following serious adverse reactions are discussed in greater detail in other sections of the label: Serious Infusion Reactions [ see Boxed Warning and Warnings and Precautions ( 5.1 ) ] . Prolonged and Severe Cytopenias [ see Boxed Warning and Warnings and Precautions ( 5.2 ) ]. Severe Cutaneous and Mucocutaneous Reactions [ see Boxed Warning and Warnings and Precautions ( 5.3 ) ]. Leukemia and Myelodysplastic Syndrome [ see Warnings and Precautions ( 5.4 ) ]. Common adverse reactions ( > 10%) in clinical trials were: cytopenias, fatigue, nasopharyngitis, nausea, abdominal pain, asthenia, cough, diarrhea, and pyrexia. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Acrotech Biopharma Inc. at 1-866-298-8433 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The reported safety data reflects exposure to Zevalin in 349 patients with relapsed or refractory, low-grade, follicular or transformed NHL across 5 trials (4 single arm and 1 randomized) and in 206 patients with previously untreated follicular NHL in a randomized trial (FIT study) who received any portion of the Zevalin therapeutic regimen. The safety data reflect exposure to Zevalin in 270 patients with relapsed or refractory NHL with platelet counts ≥150,000/ mm 3 who received 0.4 mCi/kg (14.8 MBq/kg) of Y-90 Zevalin (Group 1 in Table 4 ), 65 patients with relapsed or refractory NHL with platelet counts of ≥ 100,000 but ≤ 149,000 /mm 3 who received 0.3 mCi/kg (11.1 MBq/kg) of Y-90 Zevalin (Group 2 in Table 4 ), and 204 patients with previously untreated NHL with platelet counts ≥150,000/ mm 3 who received 0.4 mCi/kg (14.8 MBq/kg) of Y-90 Zevalin; all patients received a single course of Zevalin. The most common adverse reactions of Zevalin are cytopenias, fatigue, nasopharyngitis, nausea, abdominal pain, asthenia, cough, diarrhea, and pyrexia. The most serious adverse reactions of Zevalin are prolonged and severe cytopenias (thrombocytopenia, anemia, lymphopenia, neutropenia) and secondary malignancies. Because the Zevalin therapeutic regimen includes the use of rituximab, see prescribing information for rituximab. Table 2 displays selected adverse reaction incidence rates in patients who received any portion of the Zevalin therapeutic regimen (n=206) or no further therapy (n=203) following first-line chemotherapy (FIT study). Table 2. Per-Patient Incidence (%) of Selected Between-group difference of ≥5% Adverse Reactions Occurring in ≥ 5% of Patients with Previously Untreated Follicular NHL Treated with the Zevalin Therapeutic Regimen Zevalin (n=206) Observation (n=203) All Grades NCI CTCAE version 2.0 Grade 3-4 All Grades Grade 3-4 % % % % Gastrointestinal Disorders Abdominal pain 17 2 13 <1 Diarrhea 11 0 3 0 Nausea 18 0 2 0 Body as a Whole Asthenia 15 1 8 <1 Fatigue 33 1 9 0 Influenza-like illness 8 0 3 0 Pyrexia 10 3 4 0 Musculoskeletal Myalgia 9 0 3 0 Metabolism Anorexia 8 0 2 0 Respiratory, Thoracic & Media Cough 11 <1 5 0 Pharyngolaryngeal pain 7 0 2 0 Epistaxis 5 2 <1 0 Nervous System Dizziness 7 0 2 0 Vascular Hypertension 7 3 2 <1 Skin & Subcutaneous Night sweats 8 0 2 0 Petechiae 8 2 0 0 Pruritus 7 0 1 0 Rash 7 0 <1 0 Infections & Infestations Bronchitis 8 0 3 0 Nasopharyngitis 19 0 10 0 Rhinitis 8 0 2 0 Sinusitis 7 <1 <1 0 Urinary tract infection 7 <1 3 0 Blood and Lymphatic System Thrombocytopenia 62 51 1 0 Neutropenia 45 41 3 2 Anemia 22 5 4 0 Leukopenia 43 36 4 1 Lymphopenia 26 18 9 5 Table 3 shows hematologic toxicities in 349 Zevalin-treated patients with relapsed or refractory, low-grade, follicular or transformed B-cell NHL. Grade 2-4 hematologic toxicity occurred in 86% of Zevalin-treated patients. Table 3. Per-Patient Incidence (%) of...

Drug Interactions

7 DRUG INTERACTIONS Patients receiving medications that interfere with platelet function or coagulation should have more frequent laboratory monitoring for thrombocytopenia. No formal drug interaction studies have been performed with Zevalin. Monitor patients receiving medications that interfere with platelet function or coagulation more frequently for thrombocytopenia. ( 7 )

Contraindications

4 CONTRAINDICATIONS None. None.

Pregnancy and Breastfeeding

8.1 Pregnancy Risk Summary Based on its radioactivity, Y-90 Zevalin may cause fetal harm when administered to a pregnant woman [see Clinical Pharmacology ( 12.1 )] . Immunoglobulins are known to cross the placenta. There are no available data on Zevalin use in pregnant women to inform a drug-associated risk of major birth defects and miscarriage. Advise women of childbearing potential to use adequate contraception for a minimum of twelve months. Inform women who become pregnant while receiving Zevalin of the potential fetal risks. The estimated background risk of major birth defects and miscarriage for the indicated populations are unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. However, the background risk in the U.S. general population of major birth defects is 2-4% and of miscarriage is 15-20% of clinically recognized pregnancies.

Overdosage

10 OVERDOSAGE Severe cytopenias which may require stem cell support have occurred at doses higher than the recommended maximum total dose of 32 mCi (1184 MBq).

How Supplied

16 HOW SUPPLIED/STORAGE AND HANDLING A kit is used for preparing Y-90 radiolabeled Zevalin (NDC 72893-007-04). The contents of all vials are sterile, pyrogen-free, contain no preservatives, and are not radioactive. The kit contains four identification labels and the following four vials: One (1) Zevalin vial containing 3.2 mg ibritumomab tiuxetan in 2 mL 0.9% Sodium Chloride as a clear, colorless solution. One (1) 50 mM Sodium Acetate Vial containing 13.6 mg Sodium Acetate trihydrate in 2 mL Water for Injection, USP as a clear, colorless solution. One (1) Formulation Buffer Vial containing 750 mg Albumin (Human), 76 mg Sodium Chloride, 28 mg Sodium Phosphate Dibasic Dodecahydrate, 4 mg Pentetic Acid, 2 mg Potassium Phosphate Monobasic and 2 mg Potassium Chloride in 10 mL Water for Injection, pH 7.1 as a clear yellow to amber colored solution. One (1) empty Reaction Vial. Yttrium-90 Chloride Sterile Solution is shipped directly from the supplier upon placement of an order for the Y-90 Zevalin kit. Rituximab must be ordered separately. Storage Store the kit at 2-8°C (36-46°F). Do not freeze.

About This Information

This drug information is sourced from FDA-approved labeling via the openFDA database. It is intended for educational and reference purposes only. This is not medical advice. Always consult your healthcare provider before making decisions about medication. Drug information may be updated by the FDA; check with your pharmacist for the most current information.

What are side effects?

Side effects are unwanted reactions that can occur when taking a medication. They range from mild (headache, nausea) to severe (allergic reactions, organ damage). Not everyone experiences side effects, and severity varies. Report any concerning side effects to your doctor.

What are drug interactions?

Drug interactions occur when a medication is affected by another drug, food, or supplement. Interactions can make medications less effective or cause dangerous side effects. Always tell your doctor about all medications and supplements you take.