Changes over time in the course of advanced pancreatic cancer treatment with systemic chemotherapy: a pooled analysis of five clinical trials from two decades of the German AIO study group

L. Weiss, L. E. Fischer, V. Heinemann, F. Gieseler, T. Hoehler, J. Mayerle, D. Quietzsch, A. Reinacher-Schick, M. Schenk, G. Seipelt, J. T. Siveke, M. Stahl, U. Kaiser, D. T. Waldschmidt, K. Dorman, D. Zhang, C. B. Westphalen, S. Boeck, M. Haas