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What Are Lymph Nodes?
In this section, you'll learn how in the early stages of a tumor, lymph nodes help your immune system kill cancer cells that are starting to spread. But the growing tumor can defeat your immune system, allowing cancer cells to spread and grow, starting in the lymph nodes next to the tumor. This is why doctors look for cancer cells in lymph nodes near a tumor to know if cancer is starting to spread to the rest of the body.
In this animation you can: