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Neuroendocrine tumour grade (Ki-67) and WHO classification

How fast the tumour cells are dividing, measured by Ki-67 staining, separates slow-growing neuroendocrine tumours from aggressive neuroendocrine carcinomas and decides the treatment.

WHO 2019/2022: well-differentiated NET grade 1 (Ki-67 <3%), grade 2 (3-20%), grade 3 (>20%, well-differentiated); poorly differentiated neuroendocrine carcinoma (NEC, small- or large-cell) is a separate lineage treated like small-cell lung cancer. Grade drives choice among somatostatin analogues, PRRT, targeted therapy and chemotherapy.

Pathology: what this kind of term is about · animated schematic, not to scale
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Pathology

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