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"Tumors can be cancerous, malignant, or not cancerous. Benign. Cancerous tumors spread into or invade nearby tissues and can travel to distant places in the body to form new tumors, a process called metastasis or metastasis. Many cancers form solid tumors, but cancers of the blood, such as leukemia, generally do not. The types of cancer are usually named for the organs or tissues where the cancers form. For example, lung cancer starts in the lung. Brain cancer starts in the brain."