Interaction Between Host, Microenvironment and Immunity on Gastrointestinal Neoplasms

"Blood collection (50 ml) will be performed for all patients at baseline, at 1 month post-operative for resected patients (+ at the end of neoadjuvant treatment / before surgery if patient receives neoadjuvant treatment), and at 2-3 months after the beginning of the treatments in patients with metastases (+ at each progression).~Following analysis should be performed with~* serum for protein assays and characterization analysis of cytokines, new tumor markers and micro-RNA ...;~* plasma for protein assays and characterization analysis of micro-RNA, VEC (the content of proteins, RNA, micro-RNA and DNA) and metabolomics;~* PBMC for flow cytometry analysis, isolation macrophages;~* whole blood for circulating tumor DNA (mutations by NGS, ddPCR,…; methylation) and circulating tumor cells."

"An intraoperative liver biopsy will be performed at free edge of liver with a triangular sample for local resected patients.~This biopsy will be done with scissors, then patients will receive intraoperative hemostasis with mono- or bipolar coagulation. This procedure will be under laparoscopy or laparotomy without extending standard processing time.~This biopsy seeks to allow the evaluate liver modifications testifying the preparing for premetastatic niche, which would allow to identify the patients with risk for hepatic relapsing; the same analysis on the tumors will be performed."

"Stool collection will be performed for all patients at baseline, at 1 month post-operative for resected patients (+ at the end of neoadjuvant treatment / before surgery if patient receives neoadjuvant treatment), and at 2-3 months after the beginning of the treatments in patients with metastases (+ at each progression).~Analysis will be performed for microbiota and metabolism analysis."