Clinical impact of panel gene sequencing on therapy of advanced cancers of the digestive system: a retrospective, single center study oleh Lena Dreikhausen, Anna Klupsch, Isabella Wiest, Qiyun Xiao, Nadine Schulte, Johannes Betge, Tobias Boch, Christoph Brochhausen, Timo Gaiser, Ralf-Dieter Hofheinz, Matthias Ebert, Tianzuo Zhan