​Differentiate malignant from nonmalignant growths.

A. Both types consist of neoplastic cells, which show the properties of nearly unlimited growth.
1. Their growth pattern can rob other body cells of nutrients, interfere with the functioning of the host's body, and cause damage to the host's body.
2. These cells reproduce without any restraint, a characteristic of both benign and malignant tumors.
B. Benign tumors
1. Tend to remain localized.
2. Are usually less dangerous than malignant tumors.
3. Can be dangerous, even fatal, depending on the location of the tumor (e.g., a benign brain tumor can be fatal).
C. Malignant tumors
1. Tend to metastasize-spread to other sites in the body, where they form other tumors.
2. Are usually more dangerous than benign tumors.
3. Include many types, divided into carcinoma (cancer of the epithelial tissue), sarcoma (cancer of the connective tissue), leukemias (cancer of the blood), and lymphomas (cancer of the lymphatic system).