the Biomedical Research Network in Cancer (CIBERONC) 2 articles published in JoVE Cancer Research Establishment of Pancreatic Cancer-Derived Tumor Organoids and Fibroblasts From Fresh Tissue Jesús Frutos Díaz-Alejo*1,2,3,4, Simon April-Monn*5, Marina Cihova6, Verona Buocikova6, Jorge Villalón López1,3, Maria Urbanova6, Carmen G. Lechuga7, Miroslav Tomas6,8, Peter Dubovan6,8, Bárbara Luna Sánchez3, Sonia Camaño Páez3, Alfonso Sanjuanbenito2,9, Eduardo Lobo9, Estefanía Romio de la Heras10, Carmen Guerra2,7, Carolina de la Pinta11, Emma Barreto Melian1,2, Mercedes Rodríguez Garrote1,2, Alfredo Carrato1,2,4, Laura Ruiz-Cañas3,12,13, Bruno Sainz, Jr.2,3,12,13, Ana Torres3, Bozena Smolkova6, Julie Earl1,2,3 1Molecular Epidemiology and Predictive Tumor Markers Group, Area 3, Ramón y Cajal Health Research Institute (IRYCIS), 2The Biomedical Research Network in Cancer (CIBERONC), 3Biobank and Biomodels Platform (PT20/0045), ISCIII research and development platforms in biomedicine and health sciences, BioBank Hospital Ramón y Cajal-IRYCIS, Spanish National Biobanks Network (ISCIII Biobank Register No. B.0000678), Ramón y Cajal Health Research Institute (IRYCIS), 4Faculty of Medicine, University of Alcalá de Henares, 5Institute of Tissue Medicine and Pathology, University of Bern, 6Department of Molecular Oncology, Cancer Research Institute, Biomedical Research Center of the Slovak Academy of Sciences, 7Experimental Oncology, Molecular Oncology Program, Centro Nacional de Investigaciones Oncológicas (CNIO), 8Department of Surgical Oncology, National Cancer Institute, Slovak Medical University, 9Pancreatic and Biliopancreatic Surgery Unit, Hospital Universitario Ramón y Cajal, 10Department of Pathology, Hospital Universitario Ramón y Cajal, 11Department of Radiation Oncology, Hospital Universitario Ramón y Cajal, 12Department of Cancer, Instituto de Investigaciones Biomédicas “Alberto Sols” (IIBM), 13Cancer Stem Cell and Fibroinflammatory Group, Chronic Diseases and Cancer, Area 3, IRYCIS Tumor organoids have revolutionized cancer research and the approach to personalized medicine. They represent a clinically relevant tumor model that allows researchers to stay one step ahead of the tumor in the clinic. This protocol establishes tumor organoids from fresh pancreatic tumor tissue samples and patient-derived xenografts of pancreatic adenocarcinoma origin. Cancer Research A Standardized Liquid Biopsy Preanalytical Protocol for Downstream Circulating-Free DNA Applications Julie Earl1, Silvia Calabuig-Fariñas1, María Eugenia Sarasquete1, Laura Muinelo Romay1, Sara Lopez-Tarruella1, Beatriz Bellosillo Paricio1, Marta Rodríguez1, Karmele Valencia Leoz1, Marta Dueñas Porto1, Noelia Tarazona1, Javier Hernandez Losa1, Rodrigo Almeida Toledo1 1The Liquid Biopsy and Biomarker Working Module, the Biomedical Research Network in Cancer (CIBERONC) The liquid biopsy has revolutionized our approach to oncology translational studies, with sample collection, quality, and storage being crucial steps for its successful clinical application. Here we describe a standardized and validated protocol for downstream circulating-free DNA applications that can be applied in most translational research laboratories.