They usually grow slowly, and generally do not spread to other parts of the body. Benign tumors can usually be removed surgically without any further problems. Malignant tumors are cancer. The most common methods for cancer to spread are through the lymphatics to regional lymph nodes or through the bloodstream to distant organs. Because cancer can spread, it is important to detect it as early as possible so treatment can be initiated while the cancer is limited.
Cancers are most curable when they are localized.
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