Lymphoma is a group of blood cell tumors that develop from lymphocytes. The name often refers to just the cancerous versions rather than all such tumors. Symptoms and signs and may include enlarged lymph nodes, fever, drenching sweats, unintended weight loss, itching, and constantly feeling tired. The two main categories of lymphomas are Hodgkin's lymphomas (HL) and the non-Hodgkin lymphomas (NHL). Around 90% of lymphomas are non-Hodgkin lymphomas. Lymphoma makes up 3–4% of all kinds of cancers, making them as a group of the seventh-most common form. As for the children, they are the third-most common cancer. Lymphoma can also spread to the central nervous system, often around the brain in the meninges, regarded as lymphomatous meningitis (LM). Diagnostic makers, like ZAP-70 expression, have been studied recently.
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