Person: KÖKER, İBRAHİM HAKKI
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Publication Open Access Mucin expression in mucinous pancreatic cysts: Can string sign test predict mucin types? A single center pilot study(2020-12-01T00:00:00Z) Köker, İbrahim Hakkı; Ünver, Nurcan; Malya, Fatma Ümit; Uysal, Ömer; Şentürk, Hakan; KÖKER, İBRAHİM HAKKI; MALYA, FATMA ÜMİT; BİBERCİ KESKİN, ELMAS; ŞENTÜRK, HAKANBackground: Mucinous pancreatic cystic lesions (PCLs) express different mucin (MUC) types according to their histomorphologic types. High cystic fluid viscosity may help in the detection of mucinous PCLs. We hypothesized that high cystic fluid viscosity may be suggestive of a certain MUC type in mucinous PCLs. Methods: Prespecified MUC types (MUC1, MUC2, MUC4, MUC5AC, and MUC6) were evaluated in 18 definitively diagnosed mucinous PCLs with sufficient tissue material and prediagnostic cyst fluid viscosity evaluation—string sign (SS)—test. We evaluated the agreement of MUC expression with positive SS test results. Later, we compared cystic fluid carcinoembryonic antigen (CEA) between the prespecified MUC expressing and nonexpressing cyst types. Results: A total of 18 mucinous PCL patients, 11 females, with mean age ± SD (59.7 ± 13.3) were included. Almost all malignant mucinous PCLs expressed MUC1 (71.4%) (P = .023). We found no significant agreement between the prespecified MUC types and positive SS, except MUC4 which had mild agreement. Also, no significant relation was found between cystic fluid CEA levels and MUC expression (P = .584). Conclusion: We did not detect a significantly moderate or good agreement between the prespecified MUC types and SS test. MUC1 was highly expressed in malignant mucinous cysts; however, it was incompatible with the SS test. MUC4 expression showed mild agreement with the SS test in a small number of patientsPublication Open Access The relationship of Serum Histone H3.3 and H4 with chronic Hepatitis B(2020-09-01T00:00:00Z) Sümbül, Bilge; Şentürk, Hakan; Köker, İbrahim Hakkı; Koçhan, Koray; İnce, Ali Tüzün; Biberci Keskin, Elmas; İNCE, ALİ TÜZÜN; BİBERCİ KESKİN, ELMAS; SÜMBÜL, BİLGE; KOÇHAN, KORAY; KÖKER, İBRAHİM HAKKI; ŞENTÜRK, HAKANObjective: To determine the role of serum histone H3.3 and H4 in patients with chronic hepatitis B to explore any relationship between the two.Methods: The prospective controlled clinical pilot study was conducted in the Gastroenterology Clinic of Bezmialem Vakif University, Istanbul, Turkey, from January to October 2017, and comprised biopsy-proven patients with chronic hepatitis B and healthy controls. Demographics, hepatitis B virus deoxyribonucleic acid quantity, hepatitis B e-antigen, aspartate aminotransferase, alanine transaminase, international normalized ratio, total/direct bilirubin, albumin and thrombocyte counts as well as histological activity index and fibrosis scores were noted. Data was analysed using SPSS 22.Results: Of the 140 subjects, 70(50%) each were cases and controls. The overall mean age of the sample was 43.38±15.07 years (range: 18-70 years). There was positive correlation of histone H3.3 with hepatitis B virus deoxyribonucleic acid, aspartate aminotransferase, alanine transaminase and international normalized ratio levels. Histone H4 levels only correlated with hepatitis B virus deoxyribonucleic acid and international normalized ratio. Hepatitis B e-antigen positivity was present in 14(20%) of the cases.Conclusion: Histone H3.3 levels appeared to be associated with pathophysiological changes in chronic hepatitis B patients, suggesting that future treatments should target H3.3.Keywords: Histone H3.3, Histone H4, Extracellular histone, Chronic Hepatitis B, HBV.(JPMA 70: 1596; 2020)DOI:https://doi.org/10.5455/JPMA.19365