Seattle Children's Research Institute 2 articles published in JoVE Cancer Research Intracranial Cannula Implantation for Serial Locoregional Chimeric Antigen Receptor (CAR) T Cell Infusions in Mice Kyra Harvey1, Peter J. Madsen2,3, Tiffany Smith2, Crystal Griffin1,2, Luke Patterson1,2, Nicholas A. Vitanza4,5, Phillip B. Storm2,3, Adam C. Resnick2,3, Jessica B. Foster1,2 1Center for Data Driven Discovery in Biomedicine, Children’s Hospital of Philadelphia, 3Ben Towne Center for Childhood Cancer Research, Seattle Children’s Research Institute, 5Department of Pediatrics, Seattle Children’s Hospital, University of Washington Central nervous system (CNS) tumors are the leading cause of cancer-related death in children, and locoregional immune-based therapies are increasingly being tested for patients in clinical trials. This protocol describes methods for locoregional cannula implantation in mice for the preclinical evaluation of immunotherapeutic infusions targeting CNS tumors. Biochemistry Quantification of Protein Interaction Network Dynamics using Multiplexed Co-Immunoprecipitation Emily A. Brown1,2, Steven C. Neier3,4, Claudia Neuhauser5, Adam G. Schrum6,7,8, Stephen E.P. Smith1,2,9 1 Quantitative Multiplex Immunoprecipitation (QMI) uses flow cytometry for sensitive detection of differences in the abundance of targeted protein-protein interactions between two samples. QMI can be performed using a small amount of biomaterial, does not require genetically engineered tags, and can be adapted for any previously defined protein interaction network.