Cancer tissue has a distinctive appearance under the microscope. Among the
traits the doctor looks for are a large number of irregularly shaped dividing
cells, variation in nuclear size and shape, variation in cell size and shape,
loss of specialized cell features, loss of normal tissue organization, and a
poorly defined tumor boundary.
![Microscopic Appearance of Cancer Cells](https://webarchive.library.unt.edu/eot2008/20090114180416im_/http://www.cancer.gov/images/Documents/4167b7ca-7e27-4eec-9855-640637dde5dc/cancer18.jpg)
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