MKI67 and neoplasm: An interesting prognostic tool was developed based on data from 228 tumour samples of patients from the P024 trial, namely the PEPI (the preoperative endocrine prognostic index) score, which is based on the analysis of several features in the tumour specimen after NET, including pathological tumour size, node status, ER status, and Ki-67 levels (Table 3).