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SOMAVERT® WITH PREFILLED DILUENT SYRINGE Nonclinical Toxicology (pegvisomant with PREFILLED DILUENT SYRINGE)

13 NONCLINICAL TOXICOLOGY

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Carcinogenesis

Pegvisomant was administered subcutaneously to rats daily for 2 years at doses of 2, 8, and 20 mg/kg (about 2, 9, and 22-fold a single 30 mg dose in humans on an AUC basis). Long term treatment with pegvisomant at 8 and 20 mg/kg caused an increase in malignant fibrous histiocytoma at injection sites in males. Injection site tumors were not seen in female rats at the same doses. The increased incidence of injection site tumors was most probably caused by irritation and the high sensitivity of the rat to repeated subcutaneous injections.

Mutagenesis

Pegvisomant did not cause genetic damage in standard in vitro assays (bacterial mutation, human lymphocyte chromosome aberration).

Impairment of Fertility

Fertility studies have not been conducted with pegvisomant.

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