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Definition of Undifferentiated cancer

Undifferentiated cancer: A cancer in which the cells are very immature and "primitive" and do not look like cells in the tissue from it arose. As a rule, an undifferentiated cancer is more malignant than a cancer of that type which is well differentiated. Undifferentiated cells are said to be anaplastic.

Source: MedTerms™ Medical Dictionary
Last Editorial Review: 6/14/2012

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