Ki-67 immunohistochemistry for grade 2 and 3 neuroendocrine tumors and neuroendocrine carcinoma

Typical immunohistochemistry staining for Ki-67 in well-differentiated G2 NET (A), well-differentiated G3 NET (B), and NEC (C).

G2: grade 2; G3: grade 3; NEC: neuroendocrine carcinoma; NET: neuroendocrine tumor.

Courtesy of Halfdan Sørbye, MD.

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