ADAR1 Expression Level in Rectal Cancer

Total neoadjuvant therapy (TNT) is currently the standard treatment for locally/locally advanced rectal cancer due to better response and fewer distant metastases. In TNT, sequential chemotherapy (CT) and chemoradiotherapy (CRT) are planned and depending on the treatment response, either surgery is performed or a watch and wait approach is applied. Depending on tumor localization and patient performance status, CT is planned as induction or consolidation. Most of the time, mFOLFOX6 and CAPOX are preferred as CT regimen. In proximal rectal cancer, surgery can be performed without CRT and only after CT. In locally/locally advanced rectal cancer, the aim is to avoid surgery as much as possible or to perform sphincter-sparing surgery if possible. Colonoscopy and pelvic MR at the time of diagnosis are the most important steps in staging, treatment selection and decision making. These two diagnostic methods should be repeated especially for watch and wait decision and for response evaluation after TNT. ADAR 1 (Adenosine deaminase acting on RNA1) is an RNA editing enzyme that catalyzes the deamination of adenosine to inosine (A-to-I), a dynamic modification that can lead to a diverse transcriptome in a combinatorial manner. A defect in ADAR1-mediated RNA modification results in abnormal regulation of substrates that can affect phenotypic changes in cancer. This phenomenon of over-regulation is seen in many cancers such as colon, liver, lung, breast and esophageal cancers and in man…

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Ahmet Oruç, MD  ·  +90 0505 704 50 20  ·  mdahmetoruc@gmail.com

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