Vincristine is an important component in the treatment of acute lymphoblastic leukemia (ALL) and is now the backbone of therapy in the induction and consolidation phases of this disease. Proper dosing of vincristine is required to maximize disease control while avoiding toxicity. The gastrointestinal toxicity of vincristine such as decreased peristalsis can potentially be increased if the CYP 3A4 enzyme is inhibited. This interaction may become more prevalent with increasing use of CYP 3A4 inhibitors such as the azole antifungals. Since azoles are increasingly being used for prophylaxis and treatment of fungal infections in this patient population, an assessment of vincristine dosing and toxicity is the first step to constructing guidelines for the coadministration of these agents.
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