Vinblastine is a drug used to treat certain kinds of cancer, including lymphoma and breast cancer or testicular cancer.
It was first discovered by Robert Noble and Charles Thomas Beer from examining the Madagascar periwinkle plant. Vinblastine was first discovered as a useful drug when it was crushed into a tea. The person who drank it had less white blood cells. Now, vinblastine is used to lessen immature white blood cells in a patient.