MKI67 and pancreatitis: Accordingly, gastro-entero-pancreatic (GEP) NETs [GEP-NETs] are graded into three different categories (G1, G2, and G3) based on the Ki-67 proliferation index, with the G3 category characterized by a Ki-67 > 20% and a well-differentiated morphology across all GEP-NETs.