1.Definition A.Nomenclature Normal Cell Division What is CANCER? ●An abnormal mass cell damage- of no repair tissue that results from excessive cell division. apoptosis Tumors p perform no useful body function. Cancer Cell Division Cancer can happen 1 in almost all tissues and organs. Tumors can be Benign良 性的or Malignant:恶性的• An abnormal mass of tissue that results from excessive cell division. Tumors perform no useful body function. • Cancer can happen in almost all tissues and organs. • Tumors can be Benign 良 性的 or Malignant恶性的 What is CANCER? 1. Definition A. Nomenclature