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Table 1 WHO grading system for PNETs [27]

From: Treatment options for PNET liver metastases: a systematic review

  Grade 1 (G1) Grade 2 (G2) Grade 3 (G3)
Ki-67 index < 3% 3–20% > 20%
Mitotic count < 2/10 HPF 2–20/10 HPF > 20/10 HPF
Differentiation Well differentiated Moderately differentiated Poorly differentiated
  1. WHO World Health Organization, PNETs pancreatic neuroendocrine tumors, HPF high-power field