{"entity":{"id":"net-grade-ki67","kind":"term","name":"Neuroendocrine tumour grade (Ki-67) and WHO classification","aka":[],"tldr":"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.","summary":"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.","asOf":"2026-09-07","wikipedia":"https://en.wikipedia.org/wiki/Neuroendocrine_tumor","links":[{"label":"Wikipedia","url":"https://en.wikipedia.org/wiki/Neuroendocrine_tumor"}],"tags":[],"related":[],"indications":["neuroendocrine","sclc","grade-3-net"],"sections":[],"technologies":[],"targets":[],"drugs":[],"companies":[],"institutions":[],"pathways":[],"terms":[],"trials":[],"people":[],"bottlenecks":[],"keyPapers":[],"journals":[],"dependsOn":[],"notes":[],"category":"Pathology"},"route":"/terms/net-grade-ki67/","neighbours":{"indication":[{"id":"grade-3-net","kind":"indication","name":"Grade 3 well-differentiated neuroendocrine tumour","route":"/indications/grade-3-net/"},{"id":"lung-net","kind":"indication","name":"Lung neuroendocrine tumours (typical and atypical carcinoid)","route":"/indications/lung-net/"},{"id":"neuroendocrine","kind":"indication","name":"Neuroendocrine tumours","route":"/indications/neuroendocrine/"},{"id":"pancreatic-net","kind":"indication","name":"Pancreatic neuroendocrine tumours","route":"/indications/pancreatic-net/"},{"id":"small-intestinal-net","kind":"indication","name":"Small intestinal neuroendocrine tumours","route":"/indications/small-intestinal-net/"},{"id":"sclc","kind":"indication","name":"Small-cell lung cancer","route":"/indications/sclc/"}]}}