The Potential of Retinoic Acid Receptors As Prognostic Biomarkers and Therapeutic Targets in Gastric Cancer
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Background: Gastric cancer is a heterogeneous collection of tumors characterized by low survival rates. All-trans retinoic acid (retinoic-acid) is a clinically useful therapeutic agent belonging to the chemical family of retinoids, which consists of both natural and synthetic derivatives of vitamin-A. Retinoids are essential components of the normal diet and they regulate different physiological processes. From a therapeutic point of view, retinoic-acid is the first example of clinically useful differentiating agent. Indeed, the differentiating properties of this compound have promoted the use of retinoic-acid as a standard of care in Acute-Promyelocytic-Leukemia, a rare form of acute myeloid leukemia. In this study, we determine the RNA expression of the six isoforms of -- (/////) in view of their potential use as gastric cancer progression markers and/or therapeutic targets. In addition, we evaluate associations between the expression of these receptors and a simplified molecular classification of stomach tumors as well as the clinical characteristics of the cohort of patients analyzed. Finally, we define the prognostic value of the various -- in gastric cancer.
Methods: In this single institution and retrospective study, we consider 55 consecutive gastric cancer patients. We extract total RNA from the pathological specimens and we perform a using a customized panel of genes. This allows us to determine the expression levels of the and mRNAs as well as other transcripts of interest.
Results: Our data demonstrate ubiquitous expression of the and mRNAs in gastric cancers. High levels of , , and show a significant association with stage IV tumors, "" metastatic disease, microsatellite-stable-status, epithelial-to-mesenchymal-transition, as well as and expression. Finally, we observe a worse - in gastric cancer patients characterized by high /// mRNA levels.
Conclusions: In gastric cancer, high expression levels of /// transcripts are associated with poor clinical and molecular characteristics as well as with reduced -. Our data are consistent with the idea that , , and represent potential prognostic markers and therapeutic targets of gastric cancer.