Question
Vinca alkaloids
Q63 marksShort Notes
Answer
Vinca alkaloids are plant-derived (Vinca rosea) anticancer drugs.
Examples
- Vincristine, Vinblastine, Vinorelbine
Mechanism of action
- Bind to tubulin and inhibit microtubule polymerization
- Prevent mitotic spindle formation → arrest cell division in metaphase (M-phase specific)
Uses
- Vincristine: acute lymphoblastic leukaemia, lymphomas (part of combination regimens, e.g., ABVD, CHOP)
- Vinblastine: Hodgkin’s lymphoma, testicular cancer
Adverse effects
- Vincristine: peripheral neuropathy (dose-limiting), constipation/paralytic ileus; relatively less myelosuppressive
- Vinblastine: myelosuppression (more than vincristine), less neurotoxic
- Both: alopecia; vesicant — extravasation causes severe local tissue necrosis
- 1Cancer Chemotherapy
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