MITOMYCIN 20 mg/40mL Injection, Powder, Lyophilized, For Solution — NDC 68001-616-77 (Billing 68001-0616-77)

WARNINGS Patients being treated with mitomycin must be observed carefully and frequently during and after therapy. The use of mitomycin results in a high incidence of bone marrow suppression, particularly thrombocytopenia and leukopenia. Therefore, the following studies should be obtained repeatedly during therapy and for at least eight weeks following therapy: platelet count, white blood cell count, differential, and hemoglobin.

The occurrence of a platelet count below 100,000/mm 3 or a WBC below 4,000/mm 3 or a progressive decline in either is an indication to withhold further therapy until blood counts have recovered above these levels. Patients should be advised of the potential toxicity of this drug, particularly bone marrow suppression. Deaths have been reported due to septicemia as a result of leukopenia due to the drug.

Patients receiving mitomycin should be observed for evidence of renal toxicity. Mitomycin should not be given to patients with a serum creatinine greater than 1.7 mg percent. Usage in Pregnancy Safe use of mitomycin in pregnant women has not been established.

Teratological changes have been noted in animal studies. The effect of mitomycin on fertility is unknown.

ADVERSE REACTIONS Bone Marrow Toxicity This was the most common and most serious toxicity, occurring in 605 of 937 patients (64.4%). Thrombocytopenia and/or leukopenia may occur anytime within 8 weeks after onset of therapy with an average time of 4 weeks. Recovery after cessation of therapy was within 10 weeks.

About 25% of the leukopenic or thrombocytopenic episodes did not recover. Mitomycin produces cumulative myelosuppression. Integument and Mucous Membrane Toxicity This has occurred in approximately 4% of patients treated with mitomycin.

Cellulitis at the injection site has been reported and is occasionally severe. Stomatitis and alopecia also occur frequently. Rashes are rarely reported.

The most important dermatological problem with this drug, however, is the necrosis and consequent sloughing of tissue which results if the drug is extravasated during injection. Extravasation may occur with or without an accompanying stinging or burning sensation and even if there is adequate blood return when the injection needle is aspirated. There have been reports of delayed erythema and/or ulceration occurring either at or distant from the injection site, weeks to months after mitomycin, even when no obvious evidence of extravasation was observed during administration.

Skin grafting has been required in some of the cases. Elderly patients may be more susceptible than younger patients to injection site reactions (see PRECAUTIONS: Geriatric Use ). Renal Toxicity 2% of 1,281 patients demonstrated a statistically significant rise in creatinine.

There appeared to be no correlation between total dose administered or duration of therapy and the degree of renal impairment. Pulmonary Toxicity This has occurred infrequently but can be severe and may be life-threatening. Dyspnea with a nonproductive cough and radiographic evidence of pulmonary infiltrates may be indicative of mitomycin-induced pulmonary toxicity.

If other etiologies are eliminated, mitomycin therapy should be discontinued. Steroids have been employed as treatment of this toxicity, but the therapeutic value has not been determined. A few cases of adult respiratory distress syndrome have been reported in patients receiving mitomycin in combination with other chemotherapy and maintained at FlO 2 concentrations greater than 50% perioperatively.

Hemolytic Uremic Syndrome (HUS) This serious complication of chemotherapy, consisting primarily of microangiopathic hemolytic anemia (hematocrit ≤25%), thrombocytopenia (≤100,000/mm 3 ), and irreversible renal failure (serum creatinine ≥1.6 mg/dL) has been reported in patients receiving systemic mitomycin. Microangiopathic hemolysis with fragmented red blood cells on peripheral blood smears has occurred in 98% of patients with the syndrome. Other less frequent complications of the syndrome may include pulmonary edema (65%), neurologic abnormalities (16%), and hypertension.

Exacerbation of the symptoms associated with HUS has been reported in some patients receiving blood product transfusions. A high mortality rate (52%) has been associated with this syndrome. The syndrome may occur at any time during systemic therapy with mitomycin as a single agent or in combination with other cytotoxic drugs.

Less frequently, HUS has also been reported in patients receiving combinations of cytotoxic drugs not including mitomycin. Of 83 patients studied, 72 developed the syndrome at total doses exceeding 60 mg of mitomycin. Consequently, patients receiving ≥60 mg of mitomycin should be monitored closely for unexplained anemia with fragmented cells on peripheral blood smear, thrombocytopenia, and decreased renal function.

The incidence of the syndrome has not been defined. Therapy for the syndrome is investigational. Cardiac Toxicity Congestive heart failure, often treated effectively with diuretics and cardiac glycosides, has rarely been reported.

Almost all patients who experienced this side effect had received prior doxorubicin therapy. Acute Side Effec… [Excerpted — this section continues on DailyMed.]

PRECAUTIONS Acute shortness of breath and severe bronchospasm have been reported following the administration of vinca alkaloids in patients who had previously or simultaneously received mitomycin. The onset of this acute respiratory distress occurred within minutes to hours after the vinca alkaloid injection. The total number of doses for each drug has varied considerably.

Bronchodilators, steroids and/or oxygen have produced symptomatic relief. A few cases of adult respiratory distress syndrome have been reported in patients receiving mitomycin in combination with other chemotherapy and maintained at FlO 2 concentrations greater than 50% perioperatively. Therefore, caution should be exercised using only enough oxygen to provide adequate arterial saturation since oxygen itself is toxic to the lungs.

Careful attention should be paid to fluid balance and overhydration should be avoided. Bladder fibrosis/contraction has been reported with intravesical administration (not an approved route of administration), which in rare cases has required cystectomy. Nursing Mothers It is not known if mitomycin 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 mitomycin, it is recommended that nursing be discontinued when receiving mitomycin therapy. Pediatric Use Safety and effectiveness in pediatric patients have not been established. Geriatric Use Insufficient data from clinical studies of mitomycin are available for patients 65 years of age and older to determine whether they respond differently than younger patients.

Postmarketing surveillance suggests that elderly patients may be more susceptible than younger patients to injection site reactions (see ADVERSE REACTIONS: Integument and Mucous Membrane Toxicity ) and hypersensitivity reactions. In general, caution should be exercised when prescribing to elderly patients, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy.