The project ONCOBIOME seeks to functionally characterize and validate cancer associated gut microbiome fingerprints of high clinical relevance, and to develop diagnosis tools for personalized medicine. The project aims to: 1/ identify and validate core or cancer-specific Gut OncoMicrobiome Signatures (GOMS) associated with cancer occurrence, prognosis and response to therapy or adverse effects 2/ decipher the functional relevance of these cancer-associated gut commensal ecosystems in the regulation of host metabolism, immunity and oncogenesis, 3/ integrate these GOMS with other oncology hallmarks (clinics, genomics, immunomics, metabolomics) 4/ design optimal companion tests, based on those integrated signatures to predict cancer occurrence and progression.