MKI67 and neuroendocrine carcinoma: In particular, a mitotic count of <2 per 10 high‐power fields (HPFs) and/or a Ki‐67 index <3% corresponds to NET G1, a mitotic count of 2‐20 per 10 HPFs and/or a Ki‐67 index of 3%‐20% corresponds to NET G2, and a mitotic count of >20 per 10 HPFs and/or a Ki‐67 index >20% corresponds to NEC.