Part 1 summary 1). The basic concepts Benign and malignant tumor Cancer cells reproduce without restraint and colonize other tissues 2). Cancer is a very complex and virulent disease Cancer is becoming the leading cause of death worldwide a There are large variety kinds of cancer which can be classified by their tissue or cell origin Different types of cancer can be considered as very different diseasePart 1 summary 1). The basic concepts ▪ Benign and malignant tumor ▪ Cancer cells reproduce without restraint and colonize other tissues 2). Cancer is a very complex and virulent disease ▪ Cancer is becoming the leading cause of death worldwide. ▪ There are large variety kinds of cancer which can be classified by their tissue or cell origin. ▪ Different types of cancer can be considered as very different disease