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The exponential increase in the use of molecular biomarkers as diagnostic, prognostic, and predictive aids in the management of cancer patients highlights the increasing importance of molecular biology in oncology. The clinical utility of some molecular biomarkers like KRAS (Kirsten rat sarcoma viral oncogene homolog), BRAF (B-Raf protooncogene, serine/threonine kinase), PIK3CA (phosphatidylinositol-4,5-bisphosphate 3-kinase, catalytic subunit alpha), KIT (commonly known as cKit) (v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog), ERBB2 (commonly known as HER2) (erb-b2 receptor tyrosine kinase 2), and EGFR (epidermal growth factor receptor) among others has been validated in gastrointestinal and pancreatobiliary tumors. However, the clinical utility of some of molecular biomarkers is still being investigated and validated. Although technically not a “molecular biomarker,” the utility of “molecular imaging” is being elucidated.  This special issue covers some of the biomarkers currently in current clinical use and others being investigated, including the following: (i) MMP14 (previously known as MT1-MMP) (matrix metallopeptidase 14 (membrane-inserted) or previously known asmatrix metalloproteinase 14 (membrane-inserted)) and role in colorectal cancer, potential utility being described in other cancers [1–4], (ii) SLC6A14 (solute carrier family 6 (amino acid transporter), member 14) and potential role in pancreatic cancer, potential utility in other cancers being described [5–7], (iii) molecular profiling [8–14] of tumors to detect potentially actionable mutation or variant in pancreatic cancers, and (iv) potential utility of Raman spectroscopy in evaluation of gastrointestinal lesions. Potential utility of this technology has been described in other tumors [15–20].   Michael O. Idowu  Jennifer Laudadio  Kathryn Rizzo

Diagnostic, Prognostic, and Predictive Molecular Biomarkers and the Utility of Molecular Imaging in Common Gastrointestinal Tumors