The lymphatic system performs many crucial body functions to ensure normal health. The lymphatics are responsible for fluid and protein balance, gathering approximately 4 liters/day of interstitial fluid and returning it to the venous system. As this fluid is filtered, undesirable elements such as tumor cells and foreign pathogens are normally destroyed in lymph nodes. This system also plays a part in serving as the primary transport mechanism for the immune system. Lymphedema, a debilitating disease for which there is no known cure, affects a large number of cancer patients who have undergone lymphadenectomy and also trauma victims. The lymphatic system is also the major transport route for metastases of various cancers.

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