An in vivo OctreoScan-negative adrenal pheochromocytoma expresses somatostatin receptors and responds to somatostatin analogs treatment in vitro. - Zatelli,M.C.; Piccin,D.; Bondanelli,M.; Tagliati,F.; De Carlo,E.; Culler,M.D.; Uberti,E.C. (Horm Metab Res, 2003)