Which lesser periwinkle contains vincristine and vinblastine alkaloids and is associated with anticancer activity and possible bone marrow suppression?

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Vinca alkaloids like vincristine and vinblastine are powerful anticancer compounds that work by inhibiting tubulin polymerization, which blocks microtubule formation and halts cell division during mitosis. Because rapidly dividing cells are affected, these drugs can cause bone marrow suppression as a notable side effect. The lesser periwinkle is the species associated with these vinca alkaloids in herbal pharmacology contexts, linking this plant to anticancer activity and the potential for marrow suppression. Mechanistically, vincristine and vinblastine disrupt microtubule formation, arresting cells in metaphase and leading to cancer cell death, while also risking hematologic toxicity. This dual nature—effective against cancer cells but with a significant risk of bone marrow suppression—explains why the lesser periwinkle is the correct association.