Moreover, in a cohort of 13 patients with NETs mostly from pancreatic and intestinal origins and with suspected liver metastases, the FAPI-derived tumor fraction correlated with Ki-67 better than the FDG-derived one (Spearman’s rho 0.770 vs. 0.524), so FAPI is a potentially valuable predictor of Ki-67 status and, ultimately, of lesion aggressiveness [24]. This evidence concerns the gene MKI67 and neoplasm.