TY - JOUR T1 - INVESTIGATION OF THE FREQUENCY OF MICROSATELLITE INSTABILITY FROM PATHOLOGICAL TISSUE SAMPLES OF PATIENTS WITH GASTRIC CANCER AND ITS EFFECT ON DISEASE PROGNOSIS AND TREATMENT AU - Kiziltunc, Husnu Serdar AU - Tekin, Salim Başol PY - 2025 DA - April Y2 - 2025 DO - 10.55895/sshs.1688217 JF - Sabuncuoglu Serefeddin Health Sciences JO - SSHS PB - Amasya University WT - DergiPark SN - 2667-6338 SP - 17 EP - 21 VL - 7 IS - 1 LA - en AB - Gastric cancers continues to be one of the most important health problems in our society with high morbidity and mortality rates. Based on genomic characterization, gastric cancer has recently been defined as a heterogeneous disease consisting of different subtypes, each with unique molecular features and specific clinics. In this study, we tried to investigate the frequency of microsatellite instability in gastric cancers and its effects on the disease. In our study, microsatellite instability results of the patients were seen as microsatellite stable (MSS) in 45 (90%) patients, microsatellite instability high (MSI-H) in 2 (4%) patients and microsatellite instability low (MSI-L) in 3 (6%) patients. It was observed that microsatellite stability was an independent risk factor for mortality. (p=0.035). As a result, it was seen that microsatellite stability was a negative risk factor for mortality in gastric cancer, however, it was concluded that microsatellite instability should be evaluated together with other risk factors that may have an effect on the disease. KW - Gastric cancer KW - Microsatellite instability KW - Morbidity KW - Mortality KW - Treatment CR - Al-Batran, S. E., Homann, N., Pauligk, C., Goetze, T. O., Meiler, J., Kasper, S., ... & Hofheinz, R. D. (2019). Perioperative chemotherapy with fluorouracil plus leucovorin, oxaliplatin, and docetaxel versus fluorouracil or capecitabine plus cisplatin and epirubicin for locally advanced, resectable gastric or gastro-oesophageal junction adenocarcinoma (FLOT4): a randomised, phase 2/3 trial. The Lancet, 393(10184), 1948-1957. doi:10.1016/S0140-6736(18)32557-1 CR - An, J. Y., Kim, H., Cheong, J. H., Hyung, W. J., Kim, H., & Noh, S. H. (2012). Microsatellite instability in sporadic gastric cancer: its prognostic role and guidance for 5‐FU based chemotherapy after R0 resection. International journal of cancer, 131(2), 505-511. doi:10.1002/ijc.26399 CR - Choi, Y. Y., Bae, J. M., An, J. Y., Kwon, I. G., Cho, I., Shin, H. B., ... & Noh, S. H. (2014). Is microsatellite instability a prognostic marker in gastric cancer?: A systematic review with meta‐analysis. Journal of surgical oncology, 110(2), 129-135. doi:10.1002/jso.23618 CR - Halling, K. C., Harper, J., Moskaluk, C. A., Thibodeau, S. N., Petroni, G. R., Yustein, A. S., ... & Powell, S. M. (1999). Origin of microsatellite instability in gastric cancer. The American journal of pathology, 155(1), 205-211. doi:10.1016/S0002-9440(10)65114-0 CR - Kloor, M., & von Knebel Doeberitz, M. (2016). The immune biology of microsatellite-unstable cancer. Trends in cancer, 2(3), 121-133. doi:10.1016/j.trecan.2016.02.004 CR - Ratti, M., Lampis, A., Hahne, J. C., Passalacqua, R., & Valeri, N. (2018). Microsatellite instability in gastric cancer: molecular bases, clinical perspectives, and new treatment approaches. Cellular and Molecular Life Sciences, 75, 4151-4162. doi:10.1007/s00018-018-2906-9 UR - https://doi.org/10.55895/sshs.1688217 L1 - https://dergipark.org.tr/en/download/article-file/4824291 ER -