All forms of cancer cause cells in the body to change and grow out of control. Most types of cancer cells form a lump or mass called a tumor. Cells from the tumor can break away and travel to other parts of the body. There the cancerous cells can continue to grow. This spreading process is called metastasis. When cancer spreads, it is still named after the part of the body where it started. For example, if breast cancer spreads to the lungs, it is still breast cancer, not lung cancer. Another word for cancerous is malignant. Therefore, a cancerous tumor is called malignant. However, not all tumors are cancer. A tumor that is not cancer is called benign. Benign tumors do not grow and spread in the same manner cancer does and the tumors are usually not a threat to life. A few cancers, such as blood cancers (leukemia), do not form

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