Prospective, randomized, multicenter trial on the antiproliferative effect of lancreotide, interferon-alfa, and their combination for therapy of metastatic neuroendocrine gastroenteropancreatic tumors - The International Lanreotide and Interferon-alfa Study Group. - Faiss,S.; Pape,U.F.; Böhmig,M. (J Clin Oncol, 2003)