Which of the following statements concerning the different types of tumors INCORRECT?
• Benign tumors are not cancerous. • Benign tumors spread to other parts of the body. • A malignant tumor can metastasize and spread to nearby parts of the body and eventually to sites far away from the original tumor. • Most cancers are named for the organ or type of cell in which they begin to grow. • Which of the following statements concerning different types of cancers is INCORRECT? • Melanoma is a cancer of cells in the skin, eyes, and some other tissues, known as melanocytes. • Leukemias are cancers of the blood cells. • Lymphomas are cancers that develop in the lymphatic system. • Carcinomas are cancers that develop in the connective tissue of certain organs, such as the lung, liver, skin, or breast. • Which of the following statements concerning substances either known to cause cancer or suspected of causing cancer in humans is INCORRECT? • Exposure to carcinogens in tobacco products accounts for about one-third of all cancer deaths in the United States each year. • Several st
