paraneoplastic syndrome

A paraneoplastic syndrome is a disease or symptom that is the consequence of the presence of cancer in the body, but is not due to the local presence of cancer cells. These phenomena are mediated by humoral factors (by hormones or cytokines) excreted by tumor cells or by an immune response against the tumor. Sometimes the symptoms of paraneoplastic syndromes show even before the diagnosis of a malignancy.
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Paraneoplastic syndrome n. A syndrome directly resulting from a malignant neoplasm but not from the presence of tumor cells in the affected parts. [more]Paraneoplastic syndrome - Community and Resources

A group of symptoms caused by substances produced by certain cancer cells.

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A group of symptoms that may develop when substances released by some cancer cells disrupt the normal function of surrounding cells and tissue.