Mylotarg

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Mylotarg uses


WARNING: HEPATOTOXICITY

Hepatotoxicity, including severe or fatal hepatic veno-occlusive disease (VOD), also known as sinusoidal obstruction syndrome (SOS), has been reported in association with the use of Mylotarg as a single agent, and as part of a combination chemotherapy regimen. Monitor frequently for signs and symptoms of VOD after treatment with Mylotarg. (5.1 and 6.1)

WARNING: HEPATOTOXICITY

See full prescribing information for complete boxed warning.

Hepatotoxicity, including severe or fatal hepatic veno-occlusive disease (VOD), also known as sinusoidal obstruction syndrome (SOS), has been reported in association with the use of Mylotarg. (5.1, 6.1)

1 INDICATIONS AND USAGE

Mylotarg is a CD33-directed antibody-drug conjugate indicated for:

1.1 Newly-Diagnosed CD33-positive Acute Myeloid Leukemia (AML)

Mylotarg is indicated for the treatment of newly-diagnosed CD33-positive acute myeloid leukemia in adults.

1.2 Relapsed or Refractory CD33-positive AML

Mylotarg is indicated for the treatment of relapsed or refractory CD33-positive acute myeloid leukemia in adults and in pediatric patients 2 years and older.

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2 DOSAGE AND ADMINISTRATION

2.1 Premedication and Special Considerations

2.2 Recommended Dosage

Newly-Diagnosed De Novo CD33-positive AML

A treatment course including Mylotarg in combination therapy for adults with newly-diagnosed de novo CD33-positive AML consists of 1 induction cycle and 2 consolidation cycles .

For the induction cycle, the recommended dose of Mylotarg is 3 mg/m2 (up to one 4.5 mg vial) on Days 1, 4, and 7 in combination with daunorubicin and cytarabine. For patients requiring a second induction cycle, do NOT administer Mylotarg during the second induction cycle.

For the consolidation cycles, the recommended dose of Mylotarg is 3 mg/m2 on Day 1 (up to one 4.5 mg vial) in combination with daunorubicin and cytarabine.

Newly-Diagnosed CD33-positive AML (single-agent regimen)

A treatment course of Mylotarg as a single agent for adults with newly-diagnosed CD33-positive AML consists of 1 cycle of induction and up to 8 cycles of continuation therapy .

For the induction cycle, the recommended dose of Mylotarg is 6 mg/m2 as a single agent on Day 1, and 3 mg/m2 on Day 8.

For continuation, the recommended dose of Mylotarg is 2 mg/m2 as a single agent on Day 1 every 4 weeks.

Relapsed or Refractory CD33-positive AML (single-agent regimen)

The recommended dose of Mylotarg as a single agent for treatment of relapsed or refractory CD33-positive AML is 3 mg/m2 (up to one 4.5 mg vial) on Days 1, 4, and 7 .

2.3 Dosage Modifications for Toxicities

Monitor blood counts frequently through resolution of cytopenias. Monitor blood counts and chemistries at least three times per week through recovery from treatment-related toxicities. Management of some adverse reactions [see Warnings and Precautions (5) and Adverse Reactions (6)] may require dose interruptions or permanent discontinuation of Mylotarg Table 1 shows the dose modification guidelines for hematologic and nonhematologic toxicities.

Hematologic and Nonhematologic Toxicities Recommended Action
Abbreviations: ALT=alanine aminotransferase; AST=aspartate aminotransferase; VOD=veno-occlusive disease; ULN=upper limit of normal.
For patients receiving Mylotarg in combination therapy
Persistent thrombocytopenia
  • If platelet count does not recover to greater than or equal to 100 Gi/L within 14 days following the planned start date of the consolidation cycle (14 days after hematologic recovery following previous cycle), discontinue Mylotarg (do not administer Mylotarg in the consolidation cycles).
Persistent neutropenia
  • If neutrophil count does not recover to greater than 0.5 Gi/L within 14 days following the planned start date of the consolidation cycle (14 days after hematologic recovery following previous cycle), discontinue Mylotarg (do not administer Mylotarg in the consolidation cycles).
For all patients receiving Mylotarg (Monotherapy or in Combination)
VOD
  • Discontinue Mylotarg .
Total bilirubin greater than 2 × ULN, or AST and/or ALT greater than 2.5 × ULN
  • Delay treatment with Mylotarg until recovery of total bilirubin to less than or equal to 2 × ULN and AST and ALT to less than or equal to 2.5 × ULN prior to each dose.
  • Omit scheduled dose if delayed more than 2 days between sequential infusions.
Infusion-related reactions
  • Interrupt the infusion and institute appropriate medical management.
  • Administer acetaminophen, diphenhydramine and/or methylprednisolone, if needed
  • Provide supportive care measures as needed.
  • For mild, moderate or severe infusion related reactions, once symptoms resolve, consider resuming the infusion at no more than half the rate at which the reaction occurred. Repeat the procedure above in the event of recurrence of symptoms.
  • Permanently discontinue Mylotarg upon occurrence of a severe infusion reaction or for any life-threatening infusion reaction .
Other severe or life-threatening non-hematologic toxicities
  • Delay treatment with Mylotarg until recovery to a severity of no more than mild.
  • Omit scheduled dose if delayed more than 2 days between sequential infusions.

2.4 Instructions for Reconstitution, Dilution, and Administration

Use appropriate aseptic technique for the reconstitution and dilution procedures. Protect the reconstituted and diluted Mylotarg solution from light.

Reconstitution


Dilution


Administration

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3. DOSAGE FORMS AND STRENGTHS

For injection: 4.5 mg as a white to off-white lyophilized cake or powder in a single-dose vial for reconstitution and further dilution.

For Injection: 4.5 mg as a lyophilized cake or powder in a single-dose vial for reconstitution and dilution (3).

4. CONTRAINDICATIONS

Mylotarg is contraindicated in patients with a history of hypersensitivity to the active substance in Mylotarg or any of its components or to any of the excipients. Reactions have included anaphylaxis [see Warnings and Precautions (5.2) and Adverse Reactions (6)].

Hypersensitivity to Mylotarg or any of its components (4).

5 WARNINGS AND PRECAUTIONS

5.1 Hepatotoxicity, Including Veno-occlusive Liver Disease (VOD)

Hepatotoxicity, including life-threatening and sometimes fatal hepatic VOD events, have been reported in patients receiving Mylotarg as a single agent or as part of a combination chemotherapy regimen .

In ALFA-0701, VOD events were reported in 6/131 (5%) patients during or following treatment with Mylotarg, or following later hematopoietic stem cell transplantation (HSCT). The median time from the Mylotarg dose to onset of VOD was 9 days (range: 2–298 days), with 5 events occurring within 28 days of any dose of Mylotarg and 1 event occurring greater than 28 days after the last dose of Mylotarg. Three of the 6 VOD events were fatal. VOD was also reported in 2 patients in the control arm of ALFA-0701 after receiving Mylotarg as a therapy for relapsed AML.

In MyloFrance-1 (MYLOTARG 3 mg/m2 on Days 1, 4 and 7), VOD events were reported in none of the 57 patients during or following treatment, or following HSCT after completion of Mylotarg treatment.

Based on an analysis across trials, the risk of VOD was higher in adult patients who received higher doses of Mylotarg as monotherapy, in patients with moderate or severe hepatic impairment prior to receiving Mylotarg, in patients treated with Mylotarg after HSCT, and in patients who underwent HSCT after treatment with Mylotarg. Patients who had moderate/severe hepatic impairment prior to treatment with Mylotarg were 8.7 times more likely to develop VOD compared to patients without moderate/severe hepatic impairment at baseline. Patients treated with Mylotarg for relapse after HSCT were 2.6 times more likely to develop VOD compared to patients without prior HSCT. Patients who underwent HSCT following Mylotarg treatment were 2.9 times more likely to develop VOD after HSCT compared to patients without HSCT following Mylotarg treatment. Although no relationship was found between VOD and time of HSCT relative to higher Mylotarg monotherapy doses, the ALFA-0701 study recommended an interval of 2 months between the last dose of Mylotarg and HSCT. In MyloFrance-1, no patients underwent HSCT within 3.5 months of Mylotarg therapy.

Assess ALT, AST, total bilirubin, and alkaline phosphatase prior to each dose of Mylotarg. After treatment with Mylotarg, monitor frequently for signs and symptoms of VOD; these may include elevations in ALT, AST, total bilirubin, hepatomegaly (which may be painful), rapid weight gain, and ascites. Monitoring only total bilirubin may not identify all patients at risk of VOD. For patients who develop abnormal liver tests, more frequent monitoring of liver tests and clinical signs and symptoms of hepatotoxicity is recommended. For patients who proceed to HSCT, monitor liver tests frequently during the post-HSCT period, as appropriate.

Manage signs or symptoms of hepatic toxicity by dose interruption or discontinuation of Mylotarg . In patients who experience VOD, discontinue Mylotarg and treat according to standard medical practice.

5.2 Infusion-Related Reactions

Life-threatening or fatal infusion related-reactions can occur during or within 24 hours following infusion of Mylotarg . Signs and symptoms of infusion-related reactions may include fever, chills, hypotension, tachycardia, hypoxia and respiratory failure.

Premedicate prior to Mylotarg infusion . Monitor vital signs frequently during infusion. Interrupt infusion immediately for patients who develop evidence of infusion reaction, especially dyspnea, bronchospasm, or hypotension. Monitor patients during and for at least 1 hour after the end of the infusion or until signs and symptoms completely resolve. Discontinue use of Mylotarg in patients who develop signs or symptoms of anaphylaxis, including severe respiratory symptoms or clinically significant hypotension .

5.3 Hemorrhage

Mylotarg is myelosuppressive and can cause fatal or life-threatening hemorrhage due to prolonged thrombocytopenia. In ALFA-0701,, all grades and Grade 3–4 bleeding events were reported in 118/131 (90%) and 27/131 (21%) patients, respectively. Fatal bleeding events (including cerebral hematoma, intracranial hematoma, and subdural hematoma) occurred in 4/131 (3%) patients. Thrombocytopenia with platelet counts less than 50 Gi/L persisting more than 42 days occurred in 19 (19%) patients in the induction phase . The proportion of patients with persistent thrombocytopenia increased with progressive treatment phases and was higher in patients treated with Mylotarg plus chemotherapy than with chemotherapy alone .

In AML-19 (MYLOTARG monotherapy at 6 mg/m2 Day 1 and 3 mg/m2 Day 8), all grades and Grade 3 or higher bleeding were reported in 28/111 (25%) and 14/111 (13%) patients, respectively. Fatal bleeding occurred in 1/111 (1%). In MyloFrance-1 (MYLOTARG 3 mg/m2 as monotherapy), Grade 3 bleeding was reported in 4/57 (7%) patients, but no patient experienced Grade 4 hemorrhage.

Assess blood counts prior to each dose of Mylotarg and monitor blood counts frequently after treatment with Mylotarg until resolution of cytopenias. Monitor patients for signs and symptoms of bleeding during treatment with Mylotarg. Manage severe bleeding, hemorrhage or persistent thrombocytopenia using dose delay or permanent discontinuation of Mylotarg , and provide supportive care per standard practice.

5.4 QT Interval Prolongation

QT interval prolongation has been observed in patients treated with other drugs containing calicheamicin. When administering Mylotarg to patients who have a history of or predisposition for QTc prolongation, who are taking medicinal products that are known to prolong QT interval, and in patients with electrolyte disturbances, obtain electrocardiograms (ECGs) and electrolytes prior to the start of treatment and as needed during administration.

5.5 Use in AML with Adverse-Risk Cytogenetics

In subgroup analyses in ALFA-0701, the addition of Mylotarg to standard combination chemotherapy did not improve event-free survival in the subgroup of patients having adverse-risk cytogenetics. For patients being treated with Mylotarg in combination with daunorubicin and cytarabine for newly-diagnosed de novo AML, when cytogenetics testing results become available consider whether the potential benefit of continuing treatment with Mylotarg outweighs the risks for the individual patient.

5.6 Embryo-Fetal Toxicity

Based on its mechanism of action and findings from animal studies, Mylotarg can cause embryo-fetal harm when administered to a pregnant woman. In animal studies, Mylotarg caused embryo-fetal toxicity, starting at a dose that was approximately 0.4 times the exposure in patients at the maximum recommended dose, based on the area under the concentration-time curve (AUC). Advise females of reproductive potential to use effective contraception during treatment with Mylotarg and for at least 6 months after the final dose of Mylotarg. Advise males with female partners of reproductive potential to use effective contraception during treatment with Mylotarg and for at least 3 months after the last dose of Mylotarg. Apprise pregnant women of the potential risk to the fetus. Advise women to contact their healthcare provider if they become pregnant or if pregnancy is suspected during treatment with Mylotarg [see Use in Specific Populations (8.1, 8.3), Clinical Pharmacology (12.1), and Nonclinical Toxicology (13.1)].

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6 ADVERSE REACTIONS

The following serious adverse reactions associated with Mylotarg are discussed in detail in other sections of the prescribing information:


The most common adverse reactions (greater than 15%) were hemorrhage, infection, fever, nausea, vomiting, constipation, headache, increased AST, increased ALT, rash, and mucositis (6).

To report SUSPECTED ADVERSE REACTIONS, contact Pfizer Inc at 1-800-438-1985 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.

Combination Therapy in Newly-Diagnosed De Novo CD33-positive AML

The safety evaluation of Mylotarg (3 mg/m2 Day 1, 4 and 7 in combination with daunorubicin and cytarabine [DA]) in adults is based on data from ALFA-0701 for 131 patients treated with Mylotarg plus DA and in 137 patients treated with DA alone . In this study, 123 patients received all 3 fractionated doses of Mylotarg and 7 patients missed at least 1 dose, with a mean total dose administered during induction of 14.51 mg (range: 4.6–18.0). Mylotarg was received by 91 (70%) patients in the Mylotarg arm during Consolidation 1 and 64 (49%) patients in the Mylotarg arm during Consolidation 2.

Safety data consisting of selected TEAEs considered most important for understanding the safety profile of Mylotarg as well as all adverse events (AEs) that led to the permanent discontinuation of treatment were retrospectively collected. The selected TEAEs consisted of all grades hemorrhages, all grades VOD, and severe infections.

Discontinuation due to any adverse reaction occurred in 31% of patients in the Mylotarg arm versus 7% in the DA arm. The most frequent (greater than or equal to 1%) adverse reactions for patients treated with Mylotarg that led to permanent discontinuation were thrombocytopenia (15%), VOD (3%), and septic shock (2%).

Fatal adverse reactions occurred in 8 patients (6%) in the Mylotarg arm versus 3 patients (2%) in the DA arm. In the Mylotarg arm, 3 patients died of VOD, 4 patients died of hemorrhage-related events (CNS hemorrhage, hemorrhagic shock), and 1 patient died of suspected cardiac cause. In the DA arm, 3 patients died of sepsis.

Mylotarg + Daunorubicin + Cytarabine

(n, %)

Daunorubicin + Cytarabine

(n, %)

Abbreviations: AML=acute myeloid leukemia; N=number of patients; PT=preferred term.
Induction N = 131 N = 137
InfectionInfection is a grouped term consisting of multiple preferred terms. 61 (47%) 53 (39%)
HemorrhageHemorrhage is a grouped term consisting of multiple preferred terms. 24 (18%) 12 (9%)
Veno-occlusive liver diseaseVeno-occlusive liver disease includes the following reported PTs: Veno-occlusive liver disease, veno-occlusive disease. 3 (2%) 0
Consolidation 1 N = 91 N = 103
Infection 50 (55%) 43 (42%)
Hemorrhage 5 (5%) 0
Veno-occlusive liver disease 0 0
Consolidation 2 N = 64 N = 107
Infection 32 (50%) 54 (50%)
Hemorrhage 4 (6%) 0
Veno-occlusive liver disease 0 0

All patients in ALFA-0701 developed severe neutropenia, thrombocytopenia and anemia. The incidence of Grade 3–4 thrombocytopenia that was prolonged in the absence of active leukemia was higher in patients treated with Mylotarg (Table 3).

Mylotarg + Daunorubicin + Cytarabine

(n/N, %)

Daunorubicin + Cytarabine

(n/N, %)

Induction
Prolonged thrombocytopenia 19/101 (19%) 7/97 (7%)
Prolonged neutropenia 3/106 (3%) 0/101 (0%)
Consolidation 1
Prolonged thrombocytopenia 21/87 (24%) 6/91 (7%)
Prolonged neutropenia 3/88 (3%) 1/97 (1%)
Consolidation 2
Prolonged thrombocytopenia 22/62 (35%) 25/103 (24%)
Prolonged neutropenia 1/62 (2%) 2/105 (2%)

Table 4 summarizes shifts in selected chemistry abnormalities by treatment arm for patients treated in ALFA-0701.

Mylotarg + Daunorubicin + Cytarabine Daunorubicin + Cytarabine
Laboratory Abnormality Subjects (n) with baseline Grade less than or equal to 2 Progressed to Grade greater than or equal to 3 (n, %) Subjects (n) with baseline Grade less than or equal to 2 Progressed to Grade greater than or equal to 3 (n, %)
Hypophosphatemia 117 75 (64%) 127 52 (41%)
Hypokalemia 127 73 (57%) 133 41 (31%)
Hyponatremia 129 57 (44%) 134 36 (27%)
Alkaline phosphatase increased 120 16 (13%) 128 7 (5%)
Aspartate aminotransferase increased 126 18 (14%) 132 11 (8%)
Alanine aminotransferase increased 124 13 (10%) 132 20 (15%)
Blood bilirubin increased 119 9 (8%) 126 5 (4%)

Monotherapy for Newly-Diagnosed CD33-positive AML

The safety evaluation of Mylotarg (6 mg/m2 then 3 mg/m2, with 7 days between the doses) as monotherapy is based on a randomized, open-label, Phase 3 trial of Mylotarg (N=118) versus best supportive care (BSC) (N=119) in patients with previously untreated AML who were considered ineligible for intensive chemotherapy in Study AML-19 .

The overall incidence of any Grade adverse reactions reported in AML-19 was 87% in the Mylotarg arm and 90% in the BSC arm. The incidence of Grade greater than or equal to 3 adverse reactions was 61% in the Mylotarg arm and 68% in the BSC arm. Death due to any Adverse Event was reported in the Mylotarg arm of 19 (17%) compared to the BSC arm of 23 (20%).

Mylotarg

n=111

Best Supportive Care

n=114

Any Grade Grade ≥ 3 Any Grade Grade ≥ 3
Liver 57 (51%) 8 (7%) 52 (46%) 7 (6%)
Fatigue 51 (46%) 13 (12%) 69 (61%) 24 (21%)
Infection 49 (44%) 39 (35%) 48 (42%) 39 (34%)
Cardiac 31 (28%) 7 (6%) 37 (33%) 16 (14%)
Bleeding 28 (25%) 14 (13%) 34 (30%) 14 (12%)
Febrile neutropenia 20 (18%) 20 (18%) 27 (24%) 27 (24%)
Metabolic 18 (16%) 4 (4%) 17 (15%) 7 (6%)
Renal 7 (6%) 4 (4%) 9 (8%) 5 (4%)

Monotherapy for Relapsed or Refractory CD33-positive AML

The adverse reactions described in this section reflect exposure to Mylotarg 3 mg/m2 on Days 1, 4 and 7 as monotherapy in 57 patients with relapsed AML treated on MyloFrance-1 . All 57 (100%) patients received the 3 planned doses of Mylotarg.

During the treatment period, Grade 3 treatment-emergent adverse events (TEAEs) that occurred in greater than 1% patients included sepsis (32%), fever (16%), rash (11%), pneumonia (7%), bleeding (7%), mucositis (4%), pain (4%), diarrhea (2%), headaches (2%), tachycardia (2%), and lung edema (2%). No Grade 4 toxicity was observed. All grade TEAEs that occurred in greater than 15% of patients included fever (79%), infection (42%), increased AST (40%), bleeding (23%), nausea and vomiting (21%), constipation (21%), mucositis (21%), headache (19%), increased ALT (16%), and rash (16%). No infectious deaths occurred. Grade 1 or 2 hyperbilirubinemia developed in 4 (7%) patients. No episodes of VOD occurred. Seven patients received HSCT after Mylotarg treatment. Three patients received an allogeneic BMT and 4 patients were treated with autologous BMT. No patients developed VOD following HSCT.

6.2 Postmarketing Experience

The following adverse drug reactions have been identified during post-approval use of Mylotarg. Because these reactions are 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.

Gastrointestinal Disorders: Neutropenic colitisincluding fatal events

Infections and Infestations: fungal lung infections including Pulmonary mycosis and Pneumocystis jirovecii pneumonia; and bacterial infections including Stenotrophomonas infection

Renal and Urinary Disorders: Hemorrhagic cystitis1

Respiratory, Thoracic and Mediastinal Disorders: Interstitial pneumonia1

6.3 Immunogenicity

As with all therapeutic proteins, there is potential for immunogenicity. Immunogenicity of Mylotarg was not studied in clinical trials using the recommended dose regimens.

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8 USE IN SPECIFIC POPULATIONS

Lactation: Advise not to breastfeed.

8.1 Pregnancy

Risk Summary

Based on its mechanism of action and findings from animal studies [see Clinical Pharmacology (12.1) and Nonclinical Toxicology (13.1)], Mylotarg can cause embryo-fetal harm when administered to a pregnant woman. There are no available data on Mylotarg use in pregnant women to inform a drug-associated risk of major birth defects and miscarriage. In rat embryo-fetal development studies, Mylotarg caused embryo-fetal toxicity at maternal systemic exposures that were greater than or equal to 0.4 times the exposure in patients at the maximum recommended dose, based on AUC . If Mylotarg is used during pregnancy, or if the patient becomes pregnant while taking Mylotarg, advise the patient of the potential risk to a fetus.

Adverse outcomes in pregnancy occur regardless of the health of the mother or the use of medications. The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2–4% and 15–20%, respectively.

Data

Animal Data

In an embryo-fetal development study in rats, pregnant animals received daily intravenous doses up to 1.2 mg/m2/day Mylotarg during the period of organogenesis. Embryo-fetal toxicities including fetal growth retardation as evidenced by decreased live fetal weights, incidence of fetal wavy ribs and delayed skeletal ossification were observed at greater than or equal to 0.15 mg/m2/day. Increased embryo-fetal lethality and fetal morphological anomalies (digital malformations, absence of the aortic arch, anomalies in the long bones in the forelimbs, misshapen scapula, absence of a vertebral centrum, and fused sternebrae) were observed at greater than or equal to 0.36 mg/m2/day. All doses with embryo-fetal effects were observed in the presence of maternal toxicity that included decreases in gestational body weight gain, food consumption, and gravid uterine weight. The lowest dose at which embryo-fetal effects were observed in rats (0.15 mg/m2/day) was 0.4 times the exposure in patients at the maximum recommended human dose, based on AUC.

8.2 Lactation

Risk Summary

There are no data on the presence of Mylotarg or its metabolites in human milk, the effects on the breastfed infant, or the effects on milk production. Because of the potential for adverse reactions in breastfed infants, women should not breastfeed during treatment with Mylotarg and for at least 1 month after the final dose.

8.3 Females and Males of Reproductive Potential

Pregnancy Testing

Based on animal studies, Mylotarg can cause fetal harm when administered to a pregnant woman [see Use in Specific Populations and Nonclinical Toxicology (13.1)]. Verify the pregnancy status of females of reproductive potential prior to initiating Mylotarg.

Contraception

Females

Advise females of reproductive potential to avoid becoming pregnant while receiving Mylotarg. Advise females of reproductive potential to use effective contraception during treatment with Mylotarg and for at least 6 months after the last dose .

Males

Advise males with female partners of reproductive potential to use effective contraception during treatment with Mylotarg and for at least 3 months after the last dose .

Infertility

Females

Based on findings in animals, Mylotarg may impair fertility in females of reproductive potential .

Males

Based on findings in animals, Mylotarg may impair fertility in males of reproductive potential .

8.4 Pediatric Use

The safety and efficacy of Mylotarg in combination with daunorubicin and cytarabine have not been established in the pediatric patients with newly-diagnosed de novo AML.

The safety and efficacy of Mylotarg as a single agent in the pediatric patients with relapsed or refractory AML is supported by a single-arm trial in 29 patients in the following age groups: 1 patient 1 month to less than 2 years old, 13 patients 2 years to less than 12 years old, and 15 patients 12 years to 18 years old. A literature review included an additional 96 patients with ages ranging from 0.2 to 21 years. No differences in efficacy and safety were observed by age.

8.5 Geriatric Use

Use of Mylotarg in combination with daunorubicin and cytarabine in newly-diagnosed adult patients with de novo AML is supported by a randomized, controlled trial that included 50 patients greater than or equal to 65 years old. No overall differences in safety or effectiveness were observed between these subjects and younger subjects. Use of Mylotarg monotherapy in newly-diagnosed adult patients with AML is supported by a randomized controlled trial with 118 patients treated with Mylotarg. All patients were over the age of 60 years and 65% of patients were above 75 years. No overall differences in effectiveness were observed by age.

Use of Mylotarg as single-agent treatment of relapsed or refractory AML is supported by a single-arm trial that included 27 patients 65 years or older. No overall differences in effectiveness were observed between these patients and younger patients. Elderly patients experienced a higher rate of fever and severe or greater infections.

11. DESCRIPTION

Mylotarg is an antibody-drug conjugate (ADC) composed of the CD33-directed monoclonal antibody (hP67.6; recombinant humanized immunoglobulin [Ig] G4, kappa antibody produced by mammalian cell culture in NS0 cells) that is covalently linked to the cytotoxic agent N-acetyl gamma calicheamicin. Mylotarg consists of conjugated and unconjugated gemtuzumab. The conjugated molecules differ in the number of activated calicheamicin derivative moieties attached to gemtuzumab. The number of conjugated calicheamicin derivatives per gemtuzumab molecule ranges from predominantly zero to 6, with an average of 2 to 3 moles of calicheamicin derivative per mole of gemtuzumab.

Mylotarg (gemtuzumab ozogamicin) for Injection is supplied as a sterile, white to off-white, preservative-free lyophilized cake or powder for intravenous administration. Each single-dose vial delivers 4.5 mg Mylotarg. Inactive ingredients are dextran 40 (41.0 mg), sodium chloride (26.1 mg), sodium phosphate dibasic anhydrous (2.7 mg), sodium phosphate monobasic monohydrate (0.45 mg), and sucrose (69.8 mg). After reconstitution with 5 mL of Sterile Water for Injection USP, the concentration is 1 mg/mL of Mylotarg with a deliverable volume of 4.5 mL (4.5 mg).

Chemical Structure

12 CLINICAL PHARMACOLOGY

12.1 Mechanism of Action

Mylotarg is a CD33-directed antibody-drug conjugate. The antibody portion (hP67.6) recognizes human CD33 antigen. The small molecule, N-acetyl gamma calicheamicin, is a cytotoxic agent that is covalently attached to the antibody via a linker. Nonclinical data suggest that the anticancer activity of Mylotarg is due to the binding of the ADC to CD33-expressing tumor cells, followed by internalization of the ADC-CD33 complex, and the intracellular release of N-acetyl gamma calicheamicin dimethyl hydrazide via hydrolytic cleavage of the linker. Activation of N-acetyl gamma calicheamicin dimethyl hydrazide induces double-strand DNA breaks, subsequently inducing cell cycle arrest and apoptotic cell death.

12.2 Pharmacodynamics

Saturation of a high percentage of CD33 antigenic sites is presumed to be required for maximum delivery of calicheamicin to leukemic blast cells. Near maximal peripheral CD33 saturation was observed across studies after Mylotarg dosing at dose levels of 2 mg/m2 and above.

At 9 mg/m2 Mylotarg (2 doses, 14 days apart), the risk for VOD increases as the Cmax of the first dose of Mylotarg increases. The increase in VOD is more prominent in patients with prior stem cell transplantation.

12.3 Pharmacokinetics

There are no clinical PK data for the fractionated regimen. When Mylotarg is administered at 9 mg/m2 (2 doses, 14 days apart), the Cmax following the first dose for patients who received 9 mg/m2 Mylotarg was 3.0 mg/mL and increased to 3.6 mg/mL after the second dose.

Distribution

N-acetyl gamma calicheamicin dimethyl hydrazide is approximately 97% bound to human plasma proteins in vitro. Population PK analyses found the total volume of distribution of hP67.6 antibody (sum of V1 [6.31 L] and V2 [15.1 L]) to be approximately 21.4 L in patients.

Elimination

The clearance (CL) value of hP67.6 from plasma was 0.35 L/h after the first dose and 0.15 L/h after the second dose, a decrease of roughly 60%. The terminal plasma half-life (t½) for hP67.6 was 62 hours after the first dose and 90 hours after the second dose.

Metabolism

In vitro studies demonstrated that N-acetyl gamma calicheamicin dimethyl hydrazide is extensively metabolized, primarily via nonenzymatic reduction of the disulfide moiety.

Specific Populations

Age, race, sex, mild or moderate renal impairment (creatinine clearance [CLcr] 30–89 mL/min calculated by the Cockcroft-Gault equation) or mild hepatic impairment had no clinically significant effect on the pharmacokinetics of Mylotarg. The pharmacokinetics of Mylotarg in patients with severe renal impairment (CLcr 15–29 mL/min) or moderate (total bilirubin greater than 1.5× to 3.0× ULN) and severe hepatic impairment (total bilirubin greater than 3× ULN) is unknown.

Drug Interaction Studies

No clinical drug interaction studies have been performed.

In vitro studies

At clinically relevant concentrations, Mylotarg had a low potential to:


At clinically relevant concentrations, N-acetyl gamma calicheamicin dimethyl hydrazide had a low potential to:

13 NONCLINICAL TOXICOLOGY

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Formal carcinogenicity studies have not been conducted with Mylotarg. In toxicity studies, rats were dosed weekly for 6 weeks with Mylotarg at doses up to 7.2 mg/m2/week. After 6 weeks of dosing, rats developed oval cell hyperplasia in the liver, which is considered a potentially preneoplastic finding, at 7.2 mg/m2/week (approximately 16 times the exposure in patients at the maximum recommended dose, based on AUC). Other preneoplastic or neoplastic changes observed with other antibody-calicheamicin conjugates in rats included basophilic and/or eosinophilic altered cell foci and hepatocellular adenomas. The relevance of these animal findings to humans is uncertain.

Mylotarg was clastogenic in vivo in the bone marrow of mice that received single doses greater than or equal to 22.1 mg/m2. This is consistent with the known induction of DNA breaks by calicheamicin. N-acetyl gamma calicheamicin dimethyl hydrazide (the released cytotoxic agent) was mutagenic in the bacterial reverse mutation assay and clastogenic in the in vitro micronucleus assay in human TK6 cells.

In a female fertility study, female rats were administered daily intravenous doses of Mylotarg up to 1.08 mg/m2 for 14 days before mating with untreated male rats. Significant decreases in the numbers of corpora lutea and implants were observed at 1.08 mg/m2, and dose-related decreases and increases in the number of live and dead embryos were observed at doses tested (approximately 0.4 times the exposure in patients at the maximum recommended dose, based on AUC). Increased embryofetal lethality at ≥0.36 mg/m2 was observed in the presence of maternal toxicity that included decreases in gestational body weight and food consumption. Additional findings in female reproductive organs (ovarian atrophy and decreased numbers of follicles associated with atrophy of the uterus, vagina and mammary glands) occurred in rats and monkeys after dosing with other antibody-calicheamicin conjugates.

Fertility was assessed in male rats administered daily intravenous doses of Mylotarg from 0.12 to 1.08 mg/m2 for 28 days, followed by mating with untreated females, either at the end of the dosing period or after a 9-week drug-free period. Male fertility index was decreased at doses ≥0.12 mg/m2 (approximately 1.2 times the exposure in patients at the maximum recommended dose, based on AUC). Effects on testes and epididymides occurred at ≥0.12 mg/m2, including smaller size and lower weights in addition to adverse effects on sperm. Partial recovery was noted for some effects. Additional effects in male reproductive organs occurred in repeat-dose toxicology studies and included effects on mammary gland, testes, and epididymides in rats at ≥2.4 mg/m2/week and effects on testes and epididymides in monkeys at 21.6 mg/m2/week. Testicular effects in male monkeys with other antibody-calicheamicin conjugates included degeneration of seminiferous tubules and decreased epididymidal sperm, which did not reverse following a 6-week drug-free period.

14 CLINICAL STUDIES

14.1 Newly-Diagnosed CD33-positive AML

Study ALFA-0701

Mylotarg in combination with chemotherapy was investigated in ALFA-0701, a multicenter, randomized, open-label Phase 3 study of 271 patients with newly-diagnosed de novo AML age 50 to 70 years. Patients were randomized (1:1) to receive induction therapy consisting of daunorubicin (60 mg/m2 on Days 1 to 3) and cytarabine (200 mg/m2 on Days 1 to 7) (DA) with (n=135) or without (n=136) Mylotarg 3 mg/m2 (up to maximum of one vial) on Days 1, 4, and 7. Patients who did not achieve a response after first induction could receive a second induction with daunorubicin and cytarabine alone. Patients with response received consolidation therapy with 2 courses of treatment including daunorubicin (60 mg/m2 on Day 1 of consolidation course 1; 60 mg/m2 on Days 1 and 2 of consolidation course 2) and cytarabine (1 g/m2 every 12 hours on Days 1 to 4) with or without Mylotarg 3 mg/m2 (up to a maximum of one vial) on Day 1 according to their initial randomization. Patients who experienced remission were also eligible for allogeneic transplantation. An interval of at least 2 months between the last dose of Mylotarg and transplantation was recommended.

The median age of the patients was 62 years (range, 50–70), 137 female and 134 male, and 88% had an Eastern Cooperative Oncology Group performance status (ECOG PS) of 0 to 1 at baseline. Baseline characteristics were balanced between treatment arms with the exception of gender as a higher percentage of males were enrolled in the Mylotarg arm (55%) than in the DA alone arm (44%). Overall, 59%, 65%, and 70% of patients had documented favorable/intermediate risk and 33%, 27%, and 21% had poor/adverse disease by the National Comprehensive Cancer Network (NCCN), European LeukemiaNet (ELN), and cytogenetic risk classifications, respectively. CD33 expression on AML blasts by flow cytometry harmonized from local laboratory results was determined in 194/271 (72%) patients overall. Few patients (14%) had low CD33 expression (less than 30% of blasts), and none had no expression of CD33.

Efficacy was established on the basis of event-free survival (EFS), measured from the date of randomization until induction failure, relapse, or death by any cause. Per protocol, induction failure was defined as failure to achieve CR or CRp in induction, and date of induction failure was defined as date of marrow evaluation after the last course of induction. Median EFS was 17.3 months in the Mylotarg arm versus 9.5 months in the control arm; hazard ratio (HR) 0.56 (95% CI: 0.42–0.76); 2-sided p less than 0.001 by log-rank test.

In an exploratory analysis of EFS defined as failure to achieve CR in induction, relapse, or death from any cause and using the date of randomization as the date of induction failure, median EFS was 13.6 months for Mylotarg + DA and 8.8 months for DA with HR 0.68 (95% CI: 0.51–0.91).

The Kaplan-Meier plot for per-protocol EFS is shown in Figure 1. There was no statistically significant difference between treatment arms in overall survival.

Figure 1. Kaplan-Meier Plot of Event-Free Survival (mITT Population) ALFA-0701 Trial

Abbreviations: C=cytarabine; D=daunorubicin; GO=gemtuzumab ozogamicin; mITT=modified intent-to-treat.

Figure 1

Study AML-19

Mylotarg single-agent therapy was evaluated in Study AML-19 (NCT00091234), a multicenter, randomized, open-label Phase 3 study comparing Mylotarg to best supportive care (BSC) for patients with newly-diagnosed AML who were a) greater than 75 years of age or b) 61 to 75 years of age with a World Health Organization performance status (WHO PS) greater than 2 or were unwilling to receive intensive chemotherapy. Patients were randomized 1:1 and stratified by age (61–75 vs 76–80 years vs ≥ 81 years), CD33 positivity of bone marrow blasts (less than 20 % vs 20–80% vs greater than 80% vs unknown), initial white blood cell count (less than 30 vs greater than or equal to 30 × 109/L), WHO PS (0–1 vs 2 vs 3–4), and institution.

During induction, Mylotarg 6 mg/m2 was given on Day 1 and Mylotarg 3 mg/m2 was given on Day 8. Patients with no evidence of disease progression or significant toxicities after Mylotarg induction received continuation therapy as outpatients with up to 8 courses of treatment including Mylotarg 2 mg/m2 on Day 1 every 4 weeks. Patients continued therapy if they did not experience significant toxicities, relapse, or disease progression. BSC included standard supportive care measures and hydroxyurea or other anti-metabolites for palliative purposes.

In total, 118 patients were randomized to treatment with Mylotarg and 119 patients to BSC. Overall, the median age of patients was 77 years (range, 62–88 years), and most patients (65%) had a WHO PS of 0 to 1 at baseline. Baseline characteristics were balanced between treatment arms with the exception of gender and cytogenetics. Compared to the BSC arm, the Mylotarg arm had a higher percentage of females (52% vs 39%) and patients with favorable/intermediate risk cytogenetics (50% vs 38%). The proportion with adverse cytogenetics was similar between arms (28% vs 27%). Fewer patients on the Mylotarg arm had missing cytogenetics data (22% vs 35%). CD33 expression on AML blasts by flow cytometry at a centralized location was determined in 235/237 (99%) patients; 10% had CD33 expression less than 20%.

The efficacy of Mylotarg was established on the basis of improvement in overall survival (OS). The hazard ratio (HR) for OS was 0.69 (95% CI: 0.53–0.90) (2-sided p=0.005 by log-rank test). Median OS was 4.9 months in the Mylotarg arm versus 3.6 months in the control arm.

14.2 Relapsed or refractory CD33-positive AML

Study MyloFrance-1

The efficacy of Mylotarg as a single agent was evaluated in MyloFrance-1 a phase 2, single-arm, open-label study in adults with CD33-positive AML in first relapse. Patients with secondary leukemia or a prior autologous or allogeneic stem cell transplantation were excluded. Study treatment included a single course of Mylotarg 3 mg/m2 on Days 1, 4, and 7. Consolidation therapy consisted of cytarabine intravenously every 12 hours for 3 days. The cytarabine dose was 3 g/m2 for patients less than 55 years old and 1 g/m2 for patients 55 years or older and/or patients with a creatinine clearance below 50 mL/minute. Hematopoietic stem cell transplantation (HSCT) was allowed after treatment with Mylotarg, but it was recommended to delay HSCT by at least 90 days following Mylotarg.

There were 57 patients treated with Mylotarg. Overall, the median age of patients was 64 years (range 22–80 years). The median duration of first remission was 10 months. Forty-four (78%) patients had intermediate-risk and 12 (22%) poor-risk cytogenetics.

The efficacy of Mylotarg was established on the basis of complete remission (CR) rate and duration of remission. Fifteen (26%; 95% CI 16% – 40%) patients achieved CR following a single course of Mylotarg. Median relapse-free survival, measured from the first documentation of CR to the date of relapse or death, was 11.6 months.

15 REFERENCES

16 HOW SUPPLIED/STORAGE AND HANDLING

Mylotarg for Injection is a white to off-white lyophilized cake or powder supplied in a carton (NDC 0008-4510-01) containing one 4.5 mg single-dose vial .

16.1 Storage and Handling

Refrigerate (2–8°C; 36–46°F) Mylotarg vials and store in the original carton to protect from light. DO NOT FREEZE.

Mylotarg is a cytotoxic drug. Follow applicable special handling and disposal procedures.1

17. PATIENT COUNSELING INFORMATION

Hepatotoxicity, Including Veno-occlusive Liver Disease (VOD)

Inform patients that liver problems, including severe, life-threatening, or fatal VOD may develop during Mylotarg treatment. Prior to receiving Mylotarg, inform patients who previously received, or will receive an HSCT that they may be at increased risk for developing VOD. Inform patients that the risk of developing VOD after an allogeneic HSCT is increased after receiving treatment with Mylotarg. Inform patients that signs or symptoms of liver toxicity, including rapid weight gain, right upper quadrant pain and tenderness, hepatomegaly, and ascites should be monitored regularly during treatment, but these symptoms may not identify all patients at risk or prevent the complications of liver toxicity. Inform patients that liver problems may require dosing interruption or permanent discontinuation of Mylotarg .

Hemorrhage

Inform patients that decreased platelet counts, which may be life-threatening, may develop during Mylotarg treatment and that complications associated with decreased platelet counts may include bleeding/hemorrhage events, which may be life-threatening or fatal. Inform patients to report signs and symptoms of bleeding/hemorrhage during treatment with Mylotarg. Inform patients that severe bleeding/hemorrhage may require dosing interruption or permanent discontinuation of Mylotarg .

Infusion Related Reactions

Advise patients to contact their health care provider if they experience signs and symptoms of infusion related reactions, including symptoms such as fever, chills, rash, or breathing problems .

Pregnancy and Breastfeeding

Advise men and women of reproductive potential to use effective contraception during Mylotarg treatment and for at least 3 and 6 months, respectively, after the last dose . Advise women of childbearing potential to avoid becoming pregnant while receiving Mylotarg. Advise women to contact their healthcare provider if they become pregnant, or if pregnancy is suspected, during treatment with Mylotarg. Inform the patient of the potential hazard to the fetus [see Warnings and Precautions (5.6) and Use in Specific Populations (8.1)]. Advise women against breastfeeding while receiving Mylotarg and for 1 month after the last dose .

This product's label may have been updated. For full prescribing information, please visit www.mylotarg.com.

US License No. 003

LAB-0868-1.0

Wyeth Logo

Pfizer

NDC 0008-4510-01

Rx only

Mylotarg

(gemtuzumab ozogamicin)

for Injection

4.5 mg/vial

For Intravenous Infusion Only

Single-dose vial.

No Preservatives

Discard unused portion.

Mylotarg pharmaceutical active ingredients containing related brand and generic drugs:


Mylotarg available forms, composition, doses:


Mylotarg destination | category:


Mylotarg Anatomical Therapeutic Chemical codes:


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References

  1. Dailymed."MYLOTARG (GEMTUZUMAB OZOGAMICIN) INJECTION, POWDER, LYOPHILIZED, FOR SOLUTION [WYETH PHARMACEUTICALS INC., A SUBSIDIARY OF PFIZER INC.]". https://dailymed.nlm.nih.gov/dailym... (accessed August 28, 2018).
  2. "Gemtuzumab ozogamicin". https://pubchem.ncbi.nlm.nih.gov/su... (accessed August 28, 2018).
  3. "Gemtuzumab ozogamicin - DrugBank". http://www.drugbank.ca/drugs/DB0005... (accessed August 28, 2018).

Frequently asked Questions

Can i drive or operate heavy machine after consuming Mylotarg?

Depending on the reaction of the Mylotarg after taken, if you are feeling dizziness, drowsiness or any weakness as a reaction on your body, Then consider Mylotarg not safe to drive or operate heavy machine after consumption. Meaning that, do not drive or operate heavy duty machines after taking the capsule if the capsule has a strange reaction on your body like dizziness, drowsiness. As prescribed by a pharmacist, it is dangerous to take alcohol while taking medicines as it exposed patients to drowsiness and health risk. Please take note of such effect most especially when taking Primosa capsule. It's advisable to consult your doctor on time for a proper recommendation and medical consultations.

Is Mylotarg addictive or habit forming?

Medicines are not designed with the mind of creating an addiction or abuse on the health of the users. Addictive Medicine is categorically called Controlled substances by the government. For instance, Schedule H or X in India and schedule II-V in the US are controlled substances.

Please consult the medicine instruction manual on how to use and ensure it is not a controlled substance.In conclusion, self medication is a killer to your health. Consult your doctor for a proper prescription, recommendation, and guidiance.

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Review

sdrugs.com conducted a study on Mylotarg, and the result of the survey is set out below. It is noteworthy that the product of the survey is based on the perception and impressions of the visitors of the website as well as the views of Mylotarg consumers. We, as a result of this, advice that you do not base your therapeutic or medical decisions on this result, but rather consult your certified medical experts for their recommendations.

Visitor reports

Visitor reported useful

No survey data has been collected yet

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One visitor reported doses

What is the dose of Mylotarg drug you are taking?
According to the survey conducted among sdrugs.com website users, the maximum number of people are using the following dose 1-5mg. Few medications come in only one or two doses. Few are specific for adult dose and child dose. The dose of the medicine given to the patient depends on the severity of the symptom/disease. There can be dose adjustments made by the doctor, based on the progression of the disease. Follow-up is important.
Visitors%
1-5mg1
100.0%

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No survey data has been collected yet

One visitor reported age

Visitors%
> 601
100.0%

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The information was verified by Dr. Rachana Salvi, MD Pharmacology

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