Vincristine is commonly associated with which adverse effect?

• A. Peripheral neuropathy
• B. Myelosuppression
• C. Hepatotoxicity
• D. Ototoxicity

Answer: (A)

The main idea is that vincristine’s toxicity is largely neurotoxic. Vincristine blocks microtubule polymerization, which stops cell division, but in neurons this disruption hits axonal transport—the system that moves nutrients, organelles, and signals along the long nerve fibers. When axonal transport is impaired, peripheral nerves malfunction, leading to a classic peripheral neuropathy characterized by numbness, tingling, weakness, and sometimes autonomic symptoms like constipation. This neurotoxicity is dose-limiting and typically more prominent than bone marrow suppression, which vincristine causes only modestly. Other toxicities, such as hearing loss or severe liver injury, are more typical of different chemotherapies, not the hallmark effect of vincristine.