Also, the finding of 23% of the patients having gastric carcinoids is a higher rate than reported in the literature in MEN1/ZES patients in most (0–14% (mean 2 ± 1%, from 9 series), but not all (25–33%) small series [36,61,62,116,163,165,166,169]. This evidence concerns the gene MEN1 and Zollinger-Ellison syndrome.