eribulin mesylate

Instructions for Preparation and Administration ( 2.3 ) 09/2021

1 INDICATIONS AND USAGE Eribulin Mesylate Injection is a microtubule inhibitor indicated for the treatment of patients with: • Metastatic breast cancer who have previously received at least two chemotherapeutic regimens for the treatment of metastatic disease. Prior therapy should have included an anthracycline and a taxane in either the adjuvant or metastatic setting. ( 1.1 ) • Unresectable or metastatic liposarcoma who have received a prior anthracycline-containing regimen. ( 1.2 ) 1.1 Metastatic Breast Cancer Eribulin mesylate injection is indicated for the treatment of patients with metastatic breast cancer who have previously received at least two chemotherapeutic regimens for the treatment of metastatic disease. Prior therapy should have included an anthracycline and a taxane in either the adjuvant or metastatic setting [see Clinical Studies ( 14.1 )] . 1.2 Liposarcoma Eribulin mesylate injection is indicated for the treatment of patients with unresectable or metastatic liposarcoma who have received a prior anthracycline-containing regimen [see Clinical Studies ( 14.2 )] .

2 DOSAGE AND ADMINISTRATION • Administer 1.4 mg/m 2 intravenously over 2 to 5 minutes on Days 1 and 8 of a 21-day cycle. ( 2.1 ) • Reduce dose in patients with hepatic impairment or with moderate or severe renal impairment. ( 2.1 ) • Do not mix with other drugs or administer with dextrose-containing solutions. ( 2.3 ) 2.1 Recommended Dose The recommended dose of eribulin mesylate injection is 1.4 mg/m 2 administered intravenously over 2 to 5 minutes on Days 1 and 8 of a 21-day cycle. The recommended dose of eribulin mesylate injection in patients with mild hepatic impairment (Child-Pugh A) is 1.1 mg/m 2 administered intravenously over 2 to 5 minutes on Days 1 and 8 of a 21-day cycle [see Use in Specific Populations ( 8.6 )] . The recommended dose of eribulin mesylate injection in patients with moderate hepatic impairment (Child-Pugh B) is 0.7 mg/m 2 administered intravenously over 2 to 5 minutes on Days 1 and 8 of a 21-day cycle [see Use in Specific Populations ( 8.6 )] . The recommended dose of eribulin mesylate injection in patients with moderate or severe renal impairment (creatinine clearance (CLcr) 15-49 mL/min) is 1.1 mg/m 2 administered intravenously over 2 to 5 minutes on Days 1 and 8 of a 21-day cycle [see Use in Specific Populations ( 8.7 )] . 2.2 Dose Modification Assess for peripheral neuropathy and obtain complete blood cell counts prior to each dose. Recommended dose delays • Do not administer eribulin mesylate injection on Day 1 or Day 8 for any of the following: - ANC 7 days ANC <1,000 /mm 3 with fever or infection Platelets <25,000/mm 3 Platelets <50,000/mm 3 requiring transfusion Non-hematologic Grade 3 or 4 toxicities Omission or delay of Day 8 eribulin mesylate injection dose in previous cycle for toxicity Occurrence of any event requiring permanent dose reduction while receiving 1.1 mg/m 2 0.7 mg/m 2 Occurrence of any event requiring permanent dose reduction while receiving 0.7 mg/m 2 Discontinue eribulin mesylate injection ANC = absolute neutrophil count. Toxicities graded in accordance with National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) version 3.0. 2.3 Instructions for Preparation and Administration Aseptically withdraw the required amount of eribulin mesylate injection from the single-dose vial and administer undiluted or diluted in 100 mL of 0.9% Sodium Chloride Injection, USP. Do not dilute in or administer through an intravenous line containing solutions with dextrose. Do not administer in the same intravenous line concurrent with the other medicinal products. Store undiluted eribulin mesylate injection in the syringe for up to 4 hours at room temperature or for up to 24 hours under refrigeration at 4°C (40°F). Store diluted solutions of eribulin mesylate injection for up to 4 hours at room temperature or up to 24 hours under refrigeration at 4°C (40°F). Discard unused portions of the vial.

3 DOSAGE FORMS AND STRENGTHS Injection: 1 mg/2 mL (0.5 mg/mL) eribulin mesylate is a clear, colorless, sterile solution in a single-dose vial. Injection: 1 mg per 2 mL (0.5 mg per mL) eribulin mesylate in a single-dose vial ( 3 )

4 CONTRAINDICATIONS None. None ( 4 ).

6 ADVERSE REACTIONS The most common adverse reactions (≥25%) in metastatic breast cancer were neutropenia, anemia, asthenia/fatigue, alopecia, peripheral neuropathy, nausea, and constipation. (6.1) The most common adverse reactions (≥25%) in liposarcoma and leiomyosarcoma were fatigue, nausea, alopecia, constipation, peripheral neuropathy, abdominal pain, and pyrexia. The most common (≥5%) Grade 3-4 laboratory abnormalities in liposarcoma and leiomyosarcoma were neutropenia, hypokalemia, and hypocalcemia. (6.1) To report SUSPECTED ADVERSE REACTIONS, contact Baxter Healthcare Corporation at 1-866-888-2472 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, the adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in other clinical trials and may not reflect the rates observed in clinical practice. The following adverse reactions are discussed in detail in other sections of the labeling: • Neutropenia [ see Warnings and Precautions (5.1) ] • Peripheral neuropathy [ see Warnings and Precautions (5.2) ] • QT prolongation [ see Warnings and Precautions (5.4) ] In clinical trials, Eribulin Mesylate Injection has been administered to 1963 patients including 467 patients exposed to Eribulin Mesylate Injection for 6 months or longer. The majority of the 1963 patients were women (92%) with a median age of 55 years (range: 17 to 85 years). The racial and ethnic distribution was White (72%), Black (4%), Asian (9%), and other (3%). Metastatic Breast Cancer The most common adverse reactions (≥25%) reported in patients receiving Eribulin Mesylate Injection were neutropenia, anemia, asthenia/fatigue, alopecia, peripheral neuropathy, nausea, and constipation. The most common serious adverse reactions reported in patients receiving Eribulin Mesylate Injection were febrile neutropenia (4%) and neutropenia (2%). The most common adverse reaction resulting in discontinuation of Eribulin Mesylate Injection was peripheral neuropathy (5%). The adverse reactions described in Table 2 were identified in 750 patients treated in Study 1 . In Study 1, patients were randomized (2:1) to receive either Eribulin Mesylate Injection (1.4 mg/m on Days 1 and 8 of a 21-day cycle) or single agent treatment chosen by their physician (control group). A total of 503 patients received Eribulin Mesylate Injection and 247 patients in the control group received therapy consisting of chemotherapy [total 97% (anthracyclines 10%, capecitabine 18%, gemcitabine 19%, taxanes 15%, vinorelbine 25%, other chemotherapies 10%)] or hormonal therapy (3%). The median duration of exposure was 118 days for patients receiving Eribulin Mesylate Injection and 63 days for patients receiving control therapy. Table 2 reports the most common adverse reactions occurring in at least 10% of patients in either group. Table 2: Adverse Reactions adverse reactions were graded per National Cancer Institute Criteria for Adverse Events version 4.0. with a Per-Patient Incidence of at Least 10% in Study 1 Adverse Reactions Eribulin Mesylate Injection n=503 Control Group n=247 All Grades ≥ Grade 3 All Grades ≥ Grade 3 Blood and lymphatic system disorders based upon laboratory data. Neutropenia 82% 57% 53% 23% Anemia 58% 2% 55% 4% Nervous system disorders Peripheral neuropathy includes peripheral neuropathy, peripheral sensorimotor neuropathy, peripheral motor neuropathy, polyneuropathy, peripheral sensory neuropathy, and paraesthesia. 35% 8% 16% 2% Headache 19% Grade 2 for alopecia). 10% NA Infections Urinary Tract Infection 10% 1% 5% 0 Cytopenias : Grade 3 neutropenia occurred in 28% (143/503) of patients who received Eribulin Mesylate Injection in Study 1, and 29% (144/503) of patients experienced Grade 4 neutropenia. Febrile neutropenia occurred in 5% (23/503) of patients; two patients (0.4%) died from complications of febrile neutropenia. Dose reduction due to …

7 DRUG INTERACTIONS 7.1 Effects of Other Drugs on Eribulin Mesylate Injection No drug-drug interactions are expected with CYP3A4 inhibitors, CYP3A4 inducers or P-glycoprotein (P-gp) inhibitors. Clinically meaningful differences in exposure (AUC) were not observed in patients with advanced solid tumors when Eribulin Mesylate Injection was administered with or without ketoconazole (a strong inhibitor of CYP3A4 and a P-gp inhibitor) and when Eribulin Mesylate Injection was administered with or without rifampin (a CYP3A4 inducer) [ see Clinical Pharmacology (12.3) ] . 7.2 Effects of Eribulin Mesylate Injection on Other Drugs Eribulin does not inhibit CYP1A2, CYP2C9, CYP2C19, CYP2D6, CYP2E1 or CYP3A4 enzymes or induce CYP1A2, CYP2C9, CYP2C19 or CYP3A4 enzymes at relevant clinical concentrations. Eribulin is not expected to alter the plasma concentrations of drugs that are substrates of these enzymes [ see Clinical Pharmacology (12.3) ] .

8 USE IN SPECIFIC POPULATIONS Lactation: Do not breastfeed. ( 8.2 ) Hepatic Impairment: A lower starting dose is recommended for patients with mild (Child-Pugh A) and moderate (Child-Pugh B) hepatic impairment. Patients with severe hepatic impairment (Child-Pugh C) were not studied. ( 8.6 ) Renal Impairment: A lower starting dose is recommended for patients with moderate (CLcr 30-49 mL/min) or severe (CLcr 15-29 mL/min) renal impairment. ( 8.7 ) 8.1 Pregnancy Risk Summary Based on findings from an animal reproduction study and its mechanism of action, eribulin mesylate injection can cause fetal harm when administered to a pregnant woman [see Clinical Pharmacology (12.1) ] . There are no available data on the use of eribulin mesylate injection during pregnancy. In an animal reproduction study, eribulin mesylate caused embryo-fetal toxicity when administered to pregnant rats during organogenesis at doses below the recommended human dose [see Data] . Advise pregnant women of the potential risk to a fetus. The estimated background risks of major birth defects and miscarriage for the indicated populations are unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically-recognized pregnancies is 2% to 4% and 15% to 20%, respectively. Data Animal Data In an embryo-fetal developmental toxicity study, pregnant rats received intravenous infusion of eribulin mesylate during organogenesis (Gestation Days 8, 10, and 12) at doses approximately 0.04, 0.13, 0.43 and 0.64 times the recommended human dose, based on body surface area. Increased abortion and severe fetal external or soft tissue malformations, including the absence of a lower jaw and tongue, or stomach and spleen, were observed at doses 0.64 times the recommended human dose of 1.4 mg/m 2 based on body surface area. Increased embryo-fetal death/resorption, reduced fetal weights, and minor skeletal anomalies consistent with developmental delay were also reported at doses at or above a maternally toxic dose of approximately 0.43 times the recommended human dose. 8.2 Lactation Risk Summary There is no information regarding the presence of eribulin mesylate or its metabolites in human milk, the effects on the breastfed infant, or the effects on milk production. No lactation studies in animals were conducted. Because of the potential for serious adverse reactions in breastfed infants from eribulin mesylate, advise women not to breastfeed during treatment with eribulin mesylate injection and for 2 weeks after the final dose. 8.3 Females and Males of Reproductive Potential Contraception Females Based on findings from an animal reproduction study and its mechanism of action, eribulin mesylate injection can cause fetal harm when administered to a pregnant woman [see Use in Specific Populations (8.1) ] . Advise females of reproductive potential to use effective contraception during treatment with eribulin mesylate injection and for at least 2 weeks following the final dose . Males Based on its mechanism of action, advise males with female partners of reproductive potential to use effective contraception during treatment with eribulin mesylate injection and for 3.5 months following the final dose. Infertility Males Based on animal data, eribulin mesylate injection may result in damage to male reproductive tissues leading to impaired fertility of unknown duration [see Nonclinical Toxicology (13.1) ]. 8.4 Pediatric Use The safety and effectiveness of eribulin mesylate injection in pediatric patients have not been established. The safety and effectiveness of eribulin mesylate injection alone or in combination with irinotecan in pediatric patients were assessed but not established in three open-label studies (NCT02171260, NCT03441360, and NCT03245450) in 77 pediatric patients aged 2 to <17 years with relapsed or refractory solid tumors and lymphomas, excluding central nervous system tumors. No new safety signals were observed in these …

12.1 Mechanism of Action Eribulin inhibits the growth phase of microtubules without affecting the shortening phase and sequesters tubulin into nonproductive aggregates. Eribulin exerts its effects via a tubulin-based antimitotic mechanism leading to G 2 /M cell-cycle block, disruption of mitotic spindles, and, ultimately, apoptotic cell death after prolonged mitotic blockage. In addition, eribulin treatment of human breast cancer cells caused changes in morphology and gene expression as well as decreased migration and invasiveness in vitro . In mouse xenograft models of human breast cancer, eribulin treatment was associated with increased vascular perfusion and permeability in the tumor cores, resulting in reduced tumor hypoxia, and changes in the expression of genes in tumor specimens associated with a change in phenotype.

11 DESCRIPTION Eribulin Mesylate Injection contains eribulin mesylate, a microtubule dynamics inhibitor. Eribulin mesylate is a synthetic analogue of halichondrin B, a product isolated from the marine sponge Halichondria okadai . The chemical name for eribulin mesylate is 11,15:18,21:24,28-Triepoxy-7,9-ethano-12,15-methano-9 H ,15 H -furo[3,2- i ]furo[2',3':5,6]pyrano[4,3- b ][1,4]dioxacyclopentacosin-5(4 H )-one, 2-[(2 S )-3- amino-2-hydroxypropyl]hexacosahydro-3-methoxy-26-methyl-20,27-bis(methylene)-, (2 R ,3 R ,3a S ,7 R ,8a S ,9 S ,10a R ,11 S ,12 R ,13a R ,13b S ,15 S ,18 S ,21 S ,24 S ,26 R ,28 R ,29a S )-, methanesulfonate (salt). It has a molecular weight of 826.0 (729.9 for free base). The empirical formula is C 40 H 59 NO 11 •CH 4 O 3 S. Eribulin mesylate has the following structural formula: Eribulin Mesylate Injection is a clear, colorless, sterile solution for intravenous administration. Each single-dose vial contains 1 mg of eribulin mesylate in 2 mL of solution. Each mL of solution contains 0.5 mg of eribulin mesylate (equivalent to 0.44 mg eribulin) in dehydrated alcohol (5% v/v) and water for injection (95% v/v). Sodium hydroxide or hydrochloric acid may be used for pH adjustment. Eribulin Structural Formula

10 OVERDOSAGE Overdosage of eribulin mesylate injection has been reported at approximately 4 times the recommended dose, which resulted in Grade 3 neutropenia lasting seven days and a Grade 3 hypersensitivity reaction lasting one day. There is no known antidote for eribulin mesylate injection overdose.

16 HOW SUPPLIED/STORAGE AND HANDLING Eribulin mesylate injection is a clear colorless solution. NDC 39822-2080-1 Injection: 1 mg/2 mL, in a single-dose vial. One vial per carton. Eribulin mesylate injection is a clear, colorless, sterile solution for intravenous administration. Store at 20oC to 25°C (68o to 77°F); excursions permitted to 15° to 30°C (59° to 86°F) [see USP Controlled Room Temperature]. Do not freeze or refrigerate. Store the vials in their original cartons. Eribulin mesylate injection is a cytotoxic drug. Follow applicable special handling and disposal procedures. 1