#periwinkle_plant_derivative  an antineoplastic drug used to treat some forms of cancer
  supertype:  antineoplastic_drug__antineoplastic__cancer_drug  any of several drugs that control or kill neoplastic cells; used in chemotherapy to kill cancer cells; all have unpleasant side effects that may include nausea and vomiting and hair loss and suppression of bone marrow function
  subtype:  vinblastine__Velban  periwinkle plant derivative used as an antineoplastic drug (trade name Velban) that disrupts cell division
  subtype:  vincristine__Oncovin  periwinkle plant derivative used as an antineoplastic drug (trade name Oncovin); used to treat cancer of the lymphatic system

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