National Human Genetic Resources Sharing Service Platform 1 article published in JoVE Cancer Research Patient-derived Heterogeneous Xenograft Model of Pancreatic Cancer Using Zebrafish Larvae as Hosts for Comparative Drug Assessment Lei Wang*1, Huan Chen*2,3, Fei Fei*1, Xianfeng He2,3, Shaoyang Sun1, Kunpeng Lv1, Bo Yu2,3, Jiang Long2,4,5,6, Xu Wang1 1Department of Biochemistry and Molecular Biology, Key Laboratory of Metabolism and Molecular Medicine, Ministry of Education, School of Basic Medical Sciences, Fudan University, 2National Human Genetic Resources Sharing Service Platform (2005DKA21300), 3Fudan University Shanghai Cancer Center, 4Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 5Department of Oncology, Shanghai Medical College, Fudan University, 6Pancreatic Cancer Institute, Fudan University This protocol describes optimization procedures in a virus-based dual fluorescence-labeled tumor xenograft model using larval zebrafish as hosts. This heterogeneous xenograft model mimics the tissue composition of pancreatic cancer microenvironment in vivo and serves as a more precise tool for assessing drug responses in personalized zPDX (zebrafish patient-derived xenograft) models.