Randomized phase III study of exatecan and gemcitabine compared with gemcitabine alone in untreated advanced pancreatic cancer. - Abou-Alfa,G.K.; Letourneau,R.; Harker,G.; Modiano,M.; Hurwitz,H.; Tchekmedyian,N.S.; Feit,K.; Ackerman,J.; De Jager,R.L.; Eckhardt,S.G.; O'Reilly,E.M. (J Clin Oncol, 2006)