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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Medicine --- Oncology --- Gastrointestinal malignancies --- circulating tumor DNA (ctDNA) --- colorectal cancer --- liquid biopsy --- Gastrointestinal malignancies --- circulating tumor DNA (ctDNA) --- colorectal cancer --- liquid biopsy

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Identification and development of cancer biomarkers and targets have greatly accelerated progress towards precision medicine in oncology. Studies of tumor biology have not only provided insights into the mechanisms underlying carcinogenesis, but also led to discovery of molecules that have been developed into cancer biomarkers and targets. Multi-platforms for molecular characterization of tumors using next-generation genomic sequencing, immunohistochemistry, in situ hybridization, and blood-based biopsies have greatly expanded the portfolio of potential biomarkers and targets. These cancer biomarkers have been developed for diagnosis, early detection, prognosis, and prediction of treatment response. The molecular targets have been exploited for anti-cancer therapy and delivery of therapeutic agents. This Special Issue of Biomedicines focuses on recent advances in the discovery, characterization, translation, and clinical application of cancer biomarkers and targets in malignant diseases of the digestive system. The goal is to stimulate basic and translational research and clinical collaboration in this exciting field with the hope of developing strategies for prevention and early detection/diagnosis of cancer in digestive organs, and improving therapeutic and psychosocial outcomes in patients with these malignant diseases.

n/a --- liver graft injury --- HFE --- neurokinin --- chemotherapy --- intestinal tumors --- therapeutic targets --- biliary tract carcinoma --- hepatocellular carcinoma --- clinical trial --- cell adhesion molecules --- colorectal cancer --- biomarkers --- phenotypic mosaics --- gastrointestinal oncology --- Asian Cancer Research Group (ACRG) --- biomarker --- psychosocial support --- precision therapy --- pancreatic carcinoma --- precision medicine --- Liver transplantation --- predictive biomarkers --- CD274 --- cholecystokinin --- The Cancer Genome Atlas (TCGA) --- gastrin --- pembrolizumab --- immunotherapy --- gastrin-releasing peptide --- stereotactic body radiation therapy --- immunohistochemistry --- gastric carcinoma --- liver transplant --- CAM invasion assay --- intragraft gene expression profiles --- molecular profiling --- targeted therapy --- neurotensin --- intestinal disorder --- ramucirumab --- next-generation sequencing --- colorectal carcinoma --- tumor progenitor --- circulating tumor cells --- gastrointestinal malignancies --- bombesin --- trastuzumab --- somatostatin --- zebrafish --- G protein–coupled receptors --- G protein-coupled receptors