Do insulin-like growth factor associated proteins qualify as a tumor marker? results of a prospective study in 163 cancer patients* oleh Matuschek G, Rudoy M, Peiper M, Gerber PA, Hoff NP, Buhren BA, Flehmig B, Budach W, Knoefel WT, Bojar H, Prisack HB, Steinbach G, Shukla V, Schwarz A, Kammers K, Erhardt A, Scherer A, Bölke E, Schauer M