By eHow Health Editor
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Non Hodgkin's lymphoma is a form of cancer that starts in the lymphatic system. The lymph nodes are home to lymphocytes, which are responsible for immunity and the body's defense against foreign invaders. Non Hodgkin's lymphoma starts when errors occur in the DNA of the lymphocytes. Since lymph nodes are found throughout the body, the diagnosis process has several different potential paths.
eHow Health Editor