Tumors can crowd out and destroy the healthy cells and tissues the body needs. Tumors can be benign or malignant. Benign tumors are not cancer. They stay in one place and usually are not life-threatening. Benign tumors usually can be removed, and in most cases, they do not come back.
Malignant tumors are cancer.
Malignant tumors can invade and destroy the normal tissues around them. Their abnormal cells can spread to other parts of the body, usually through the blood or lymphatic system, and form new malignant tumors. Each type of cancer has its own treatment plan. The CIS is a program of the National Cancer Institute. My father has cancer, and he has no health insurance.