“…Additionally, in previous multivariate analysis from tertiary referral centers, pathological differentiation and stage at diagnosis have been identified as the strongest prognostic features of GEP NET. Indeed, differentiation of GEP NET classified as poorly compared with well-differentiated (WD) carcinoma (Johnson et al 1986, Greenberg et al 1987, Madeira et al 1998, Travis et al 1998, Rindi et al 1999, Lim et al 2005, Panzuto et al 2005, Asamura et al 2006, Faggiano et al 2007, Lepage et al 2007, Pape et al 2008 and stage (Lo et al 1996, Pelosi et al 1996, Burke et al 1997, Madeira et al 1998, Kirshbom et al 1999, Rindi et al 1999, Shebani et al 1999, Onaitis et al 2000, Quaedvlieg et al 2001, Rigaud et al 2001, Solorzano et al 2001, Hochwald et al 2002, Plöckinger et al 2004, Panzuto et al 2005, Tomassetti et al 2006, Baudin 2007, Pape et al 2008 as long been recognized the strongest prognostic parameters before the primary location. More recently, lymph node metastases (Hellman et al 2002, Cardillo et al 2004, Lim et al 2005, Tomassetti et al 2005, Baudin 2007, García-Yuste et al 2007, Rea et al 2007, Pape et al 2008 and proliferative index have emerged as major determinant of ...…”