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Lymphoma cancer. Light micrograph of a section through a secondary lymphoma, a cancer of lymphoid tissue. This cancer has spread from a primary tumour in the breast. The spread of cancer from one site to another is known as metastasis. The lymphatic system forms a major part of the immune system, and cancer severely weakens the immune response. This makes the patient more susceptible to infections, and makes normally harmless infections life threatening. Once a cancer has spread beyond its point of origin, the chances of a cure are low. Magnification unknown.
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