Inhibition of proprotein convertases is associated with loss of growth and tumourigenicity of HT-29 human colon carcinoma cells: importance of insulin-like growth factor-1 (IGF-1) receptor processing in IGF-1-mediated functions. - Khatib,A.M.; Siegfried,G.; Prat,A.; Luis,J.; Chretien,M.; Metrakos,P.; Seidah,N.G. (J Biol Chem, 2001)