DescriptionCounting Ki-67 index in immunohistochemistry.jpg
English: Counting Ki-67 index in immunohistochemistry, in this case in a neuroendocrine tumor of the small intestine. To count as positive, a nucleus should:
Not be located in stroma.
Be at least half within the field of view.
Be large enough.
Otherwise, even weakly positive nuclei count as positive.
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