Prognostic value of somatostatin receptor-2 positivity in gastroenteropancreatic neuroendocrine tumors in reference to known prognostic factors - YENİAY, Levent and GÜRCÜ, Barış and ÜNALP, Ömer and YILMAZ, Funda and NART, Deniz and SÖZBİLEN, Murat and ÇOKER, Ahmet (Turkish Journal of Gastroenterology, 2012)