MKI67 and metastatic neoplasm: Thirty GNENs were image-negative (with no detectable signs of recurrence or metastatic disease) on a follow-up gastroscopy (n = 25), EUS (n = 6), CT (n = 21), 68Ga-DOTATATE PET/CT (n = 17), or 18F-FDG PET/CT (n = 2; GNET Type 1 G2, Ki-67 15%, and GNEC, Ki-67 75%).