NCIt definition : A macrocyclic lactone. Rhizoxin binds to tubulin and inhibits microtubule assembly,
thereby inducing cytotoxicity. This agent also may inhibit endothelial cell-induced
angiogenic activity, which may result in decreased tumor cell proliferation. (NCI04);
Alternative definition : NCI-GLOSS: A substance that is being studied in the treatment of cancer. It comes
from a fungus and is similar to vinca alkaloid drugs. It belongs to the family of
drugs called antimitotic agents.;