Final answer:
The statement is false; tumors that do not spread are benign tumors, not cancers. Cancers are specifically malignant tumors that can invade and spread to other parts of the body through metastasis. Cancer treatments can damage normal tissue due to their targeting of rapidly dividing cells.
Step-by-step explanation:
The statement that tumors that do not spread to other tissues are called cancers is false. Tumors that do not spread are known as benign tumors and remain localized to the area where they began. These types of tumors generally do not pose a significant health risk.
On the other hand, malignant tumors, which are characterized by the ability to invade neighboring tissues and spread to distant sites, are referred to as cancer. This process of spreading is known as metastasis. Lung cancer, for example, can commonly spread to the brain among other regions.
Cancer treatments can damage normal tissue because they target rapidly dividing cells, a characteristic of cancer cells. Unfortunately, some normal cells in the body also divide rapidly and can be affected by treatments such as chemotherapy and radiation therapy, leading to side effects.