Araştırmacılar(8)

• Balcı, M.
• Balci, Gulhan
• Balci, Gürhan
• Balcioglu, Mecdi Gurhan
• Cetin, Zeliha
• Cimen, Ferda Keskin
• Sayar, İlyas
• Tayfur, M.

• ArticleAçık Erişim2026/r/ebyu/18730
  ATP attenuates olaparib-induced gastric damage in rats

  Fakirullahoglu, Mesud; Temiz, Ayetullah; Yeni, Mustafa; Sezgin, Esra Tuba; Yazici, Gulce Naz; Altuner, Durdu; Gulaboglu, Mine; Suleyman, Halis

  Background Olaparib, a poly (ADP-ribose) polymerase (PARP) inhibitor widely used in cancer therapy, has been associated with gastrointestinal adverse effects; however, the underlying mechanisms remain unclear. Previous studies have suggested that oxidative stress may contribute to olaparib-induced tissue injury.Objective This study aimed to investigate the protective effects of adenosine triphosphate (ATP) against olaparib-induced gastric damage in rats.Methods Animals were divided into healthy control (HG), olaparib alone (OLPG), ATP alone (ATPG), and ATP + olaparib (ATOLG) groups. Gastric injury was evaluated by macroscopic assessment of ulcer area and ulcer number. Histopathological alterations were examined using hematoxylin-eosin (H&E) staining, and oxidative stress status was assessed by measuring lipid peroxidation and antioxidant defense parameters.Results Olaparib administration induced marked gastric mucosal injury, characterized by increased ulcer area and ulcer number, severe histopathological damage, and pronounced oxidative stress. In contrast, ATP co-administration significantly attenuated gastric injury, as evidenced by reduced ulcer area and ulcer number, improved histopathological architecture, and restoration of oxidative balance. Compared with the OLPG group, the ATOLG group showed significant improvement in macroscopic, histopathological, and oxidative stress parameters.Conclusion ATP administration attenuated olaparib-induced gastric damage and improved oxidative stress parameters in rats. Although the underlying mechanisms were not directly investigated in the present study, the obtained findings provide preliminary experimental evidence suggesting that ATP may have protective potential against olaparib-induced gastric injury.

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• ArticleAçık Erişim2026/r/ebyu/19332
  Changes in Gastritis During the COVID-19 Pandemic: A Retrospective Comparative Study According to the Sydney Criteria

  Çımen, Ferda Keskın; Çimen, Orhan

  Objective: This study aimed to evaluate whether the coronavirus disease-2019 (COVID-19) pandemic caused changes in the severity of gastritis, as assessed by the Sydney criteria, through a retrospective comparison of patients in the pre- and post-pandemic periods. Methods: Pathology reports of 107 pre-pandemic patients until March 2019 and 96 post-pandemic patients until May 2023, who underwent upper gastrointestinal endoscopy for dyspeptic complaints and were diagnosed with gastritis were retrospectively analyzed. Gastritis severity was assessed according to the Sydney criteria. Percentages were calculated and compared. Results: The pre-pandemic group included 62 women and 45 men (mean age 58.6 years). The post-pandemic group included 50 women and 46 men (mean age 57.6 years). No significant demographic differences were observed. According to the Sydney criteria, no permanent effect of COVID-19 on gastritis severity was identified. Conclusion: Our study found no significant differences in gastritis severity between the periods before and after the COVID-19 pandemic. Larger prospective studies are required to further explore potential long-term effects.

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• ArticleYayıncıda açık erişim2026/r/ebyu/11244
  Mitigating Hydroxychloroquine-Induced Oxidative Liver Damage: The Roles of Adenosine Triphosphate, Liv-52, and Their Combination in Rats

  Kandefer, Meryem Yalvac; Sezgin, Esra Tuba; Suleyman, Bahadir; Cimen, Ferda Keskin; Memiş, Fulya; Gulaboglu, Mine; Suleyman, Halis

  Hydroxychloroquine (HCQ), originally developed as an antimalarial agent, has been associated with hepatotoxic effects in experimental and clinical settings. Our study was designed to evaluate the effects of this agent on liver toxicity and to understand the protective roles of adenosine triphosphate (ATP), Liver-52 (Liv-52), and their combination. Male Wistar rats (250–280 g) were randomly assigned to five groups (n = 6): healthy control (C), HCQ only (H), ATP plus HCQ (AH), Liv-52 plus HCQ (LH), and ATP–Liv-52 plus HCQ (ALH). ATP (4 mg/kg) was administered intraperitoneally once daily, whereas Liv-52 (20 mg/kg) was administered orally via gavage. One hour later, all groups except C received HCQ (120 mg/kg, orally, twice daily). All treatments were continued for seven consecutive days. At the end of the experiment, serum aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels were measured, and liver tissues were analyzed for malondialdehyde (MDA), total glutathione (GSH), superoxide dismutase (SOD), and catalase (CAT) activities, along with histopathological evaluation. HCQ administration significantly increased oxidative stress, as evidenced by elevated MDA levels (p < 0.01) and reduced antioxidant parameters, including GSH, SOD, and CAT (p < 0.05), accompanied by prominent histopathological damage. Treatment with ATP or Liv-52 markedly ameliorated these alterations by decreasing MDA and restoring antioxidant markers. The combination treatment was observed to exhibit the most pronounced protective effect; it significantly reduced MDA levels, improved GSH, SOD, and CAT levels more effectively, and produced significant decreases in AST and ALT values (p < 0.05).

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• ArticleYayıncıda açık erişim2026/r/ebyu/11237
  Appendiceal Collision Tumors: An Institutional Case Series and Systematic Review of the Histologic Spectrum, Clinical Outcomes, and Management Strategies

  Issin, Gizem; Demir, Fatih; Cagatay, Diren Vuslat; Guvendir, Irem; Simsek, Hasan Aktug; Zemheri, Itir Ebru

  Background/Objectives: Appendiceal collision tumors (ACTs), defined by the coexistence of two or more histologically distinct neoplastic components within the appendix, are rare entities. We aimed to characterize their clinicopathologic features, management strategies, and outcomes by integrating an institutional case series with a systematic review of the literature. Methods: We retrospectively identified ACTs diagnosed at our institution and performed a PRISMA 2020-guided search of PubMed, Scopus, and Web of Science databases through May 2025 for case reports and case series. Two reviewers screened studies and extracted data on presentation, histologic composition, treatment, approaches and outcomes. Results: ACTs accounted for 4% of appendiceal tumors in our institution, all combining a neuroendocrine neoplasm (NEN) with a low-grade appendiceal mucinous neoplasm. The literature search identified 69 ACTs from 33 studies; pooled with our cases, 74 patients were evaluated. The most common pairings were NEN–appendiceal mucinous neoplasm (53%) and NEN–adenocarcinoma (26%), while three-component tumors were rare (n = 2). Early-stage tumors (pTis–pT1) were uniformly managed with appendectomy or limited resection, in line with established stage-based management algorithms for appendiceal neoplasms. Advanced-stage tumors (pT3–pT4) were treated according to the biologically dominant component, frequently with colectomy and, in high-risk mucinous disease, cytoreductive approaches. Across stages, outcomes appeared to be driven by the non-neuroendocrine component; a coexisting low-grade NEN did not independently confer worse prognosis. In ACTs with an adenocarcinoma component, goblet cell morphology was common, and outcomes appeared similar to those reported for non-collision appendiceal adenocarcinoma. Conclusions: ACTs represent a heterogeneous group in which prognosis is dictated by the non-neuroendocrine component and tumor stage. Low-grade NEN components appear biologically indolent, whereas adenocarcinoma and high-risk mucinous components have been observed to exhibit behavior similar to their solitary counterparts.

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• ArticleYayıncıda açık erişim2026/r/ebyu/10808
  Investigation of the Protective Effect of Centella asiatica Against Doxorubicin-Induced Testicular Damage in Rats

  Bedir, Fevzi; Suleyman, Zeynep; Kocaturk, Huseyin; Altay, Mehmet Sefa; Keskin Cimen, Ferda; Altuner, Durdu; Babayeva, Mansura; Suleyman, Halis

  Doxorubicin (DOX) is an antineoplastic agent commonly used in cancer therapy that is known for its testicular toxicity. DOX-induced testicular injury involves inflammation, reactive oxygen species, and oxidative stress. Centella asiatica exhibits anti-inflammatory and antioxidant properties. The present experimental study aimed to determine the potential protective efficacy of Centella asiatica in a rat model of doxorubicin-induced testicular toxicity. Rats were randomly assigned to four groups: healthy control (HC), CA, DOX, and CA + DOX (CADX). An oral dose of 200 mg/kg Centella asiatica was administered to the CA and CADX groups. The HC and DOX groups received saline. One hour later, DOX (7.5 mg/kg) was intraperitoneally injected into the DOX and CADX groups on days 1, 4, and 7. Centella asiatica markedly attenuated the DOX-induced increase in malondialdehyde, nitric oxide, and pro-inflammatory cytokine levels, while preventing the decrease in superoxide dismutase activity in testicular tissue (p < 0.001). Centella asiatica reduced the severity of DOX-induced morphological damage in testicular tissue (p < 0.05). Moreover, it partially restored reproductive hormone function. In conclusion, Centella asiatica demonstrates significant potential in mitigating DOX-induced oxidative damage, attenuating testicular injury and preserving the functional integrity of the male reproductive system.

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• ArticleYayıncıda açık erişim2026/r/ebyu/10450
  Evaluation of Epithelial Cell Adhesion Molecule, Galectin-3, and Proliferative Cell Nuclear Antigen Expression in Thyroid Papillary Carcinomas and Their Lymph Node Metastases

  Daltaban, F.; Sayar, I.; Tayfur, M.; Gürbüzel, M.; Balcı, M.

  Background: Thyroid papillary carcinoma (PTC) is the most common carcinoma of thyroid carcinomas and endocrine carcinomas. The diagnosis of thyroid PTC is made mainly by the presence of nuclear features such as nuclear clearing, groove, and nuclear inclusions. Some benign lesions of the thyroid may have nuclear features and growth patterns of papillary thyroid carcinomas, which can make the differential diagnosis difficult. Different immunohistochemical markers have always been needed to reduce diagnostic errors and detect malignancies in routine practice. As in all tumor cases, studies continue to understand carcinogenesis in thyroid carcinomas. One of the ways that can help understand this involves the use of new and effective immunohistochemical markers. Aim: This study aimed to examine the expression of epithelial cell adhesion molecule (EpCAM), Galectin-3 (Gal-3), and proliferative cell nuclear antigen (PCNA), which are immunohistochemical markers that may contribute to the diagnosis and prognosis of thyroid PTCs and lymph node (LN) metastases. Materials and Methods: EpCAM, Gal-3, and PCNA immunohistochemical markers were applied to 26 unifocal (UF) thyroid PTC cases and 25 thyroid PTC cases with LN metastasis or multifocal (MF) tumor field. Results: It was observed that the Gal-3 staining score decreased significantly in the LN metastasis focus compared to the UF tumor. With EpCAM significant loss of membranous expression was observed in the MF tumor compared to the UF tumor. There was no statistically significant difference between the case groups in terms of PCNA staining score. Conclusions: These results may be important in terms of obtaining new immunohistochemical clues for diagnosis and carcinogenesis in thyroid PTCs and their metastases. The number of cases in our study is limited, and we think that supporting the results with a large series of studies may contribute to the diagnosis and prognosis of the patients.

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• ArticleAçık Erişim2026/r/ebyu/10406
  Macroscopic growth patterns and their molecular implications in gastric carcinoma: toward risk stratification via borrmann classification

  Issin, Gizem; Demir, Fatih; Cagatay, Diren Vuslat; Bakkaloglu, Irem Guvendir; Gamsizkan, Mehmet; Yildiz, Zeliha; Yilmaz, Ismail; Ozmen, Sevilay; Zemheri, Itir Ebru; Demiriz, Murat

  Abstract: Gastric carcinoma (GC) is a heterogeneous disease with diverse histopathological and molecular features. The Borrmann classification, which reflects the macroscopic growth pattern, has potential value in correlating with molecular characteristics and predicting disease extent and prognosis. However, its relationship with GC molecular subtypes remains incompletely defined. In the present study, we attempted to assess the relationship between Borrmann classification and clinical, pathological, and molecular findings in GC, as well as its impact on overall survival. Material and methods: A retrospective analysis was conducted on 255 patients who underwent surgery for GC between January 2012 and 2021. Cases were classified into types I, II, III, and IV, according to the Borrmann classification. Clinical data, tumor characteristics, molecular marker expression status, and survival data were analyzed in relation to the Borrmann classification. Result: The most common macroscopic growth pattern was Borrmann type III (38.8%). Type IV tumors were associated with younger patients, larger size, epithelial-mesenchymal transition–related molecular subtype, diffuse histology, and a higher incidence of peritoneal dissemination. In contrast, type I tumors were more frequently diagnosed at earlier stages and demonstrated well-differentiated morphology, frequent HER2 positivity, and p53 mutant expression. Kaplan–Meier analysis demonstrated clear survival differences among Borrmann types, with type I tumors showing the most favorable outcomes (median 82.2 months) and type IV tumors the poorest (median 34.6 months; log-rank p < 0.001). When adjusted for covariates in the multivariate Cox model, only age, Borrmann type III (compared to type I) and advanced nodal status (pN0 compared to pN2–3) were found to be independent prognostic indicators. Advanced age was consistently associated with reduced survival time, type III tumors resulted in more than a twofold increase in mortality risk, and higher nodal stages were strongly linked to poor outcomes. Conclusion: The Borrmann classification showed associations with molecular and pathological features of GC, and survival varied among types, suggesting potential utility for prognostic assessment prior to surgery.

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• ArticleYalnız künye2026/r/ebyu/10308
  SOX17 and TRPS1 in Müllerian, Breast, and Mesothelial Tumors: Tissue-Based Specificity Profiles and Diagnostic Pitfalls in Malignant Serous Effusions

  Issin, Gizem; Demir, Fatih; Yaylı, Esra; Çağatay, Diren Vuslat; Yılmaz, İsmail; Girgin, Rabia Burçin; Gamsızkan, Mehmet; Zemheri, Ebru; Şimşek, Hasan Aktuğ; Sayar, İlyas

  Background: Malignant serous effusions may be the first manifestation of an underlying malignancy, and accurate primary-site attribution is essential. However, distinguishing Müllerian carcinoma, breast carcinoma, and mesothelioma in effusion cytology remains a challenge because of overlapping immunophenotypes. We evaluated SOX17 and TRPS1 in this setting. Materials and Methods: A multicenter retrospective cohort including 650 tissue specimens (300 breast carcinomas, 300 Müllerian tumors, and 50 mesothelial lesions) and 150 malignant serous effusion cell blocks was analyzed. SOX17 and TRPS1 expression was assessed by immunohistochemistry and compared with established markers, including PAX8, GATA3, WT1, and calretinin. Sensitivity, specificity, and positive predictive value (PPV) were calculated according to the primary diagnosis. Results: In the tissue cohort, SOX17 showed 87% sensitivity and 100% specificity for Müllerian tumors, with no expression in breast carcinomas or mesothelial lesions, including tumors with PAX8/WT1 co-expression. This specificity was retained in cell blocks, yielding a PPV of 100%. TRPS1 showed 98% sensitivity for breast carcinoma and identified 84% of GATA3-negative breast carcinomas. However, TRPS1 expression was also observed in 48% of tubo-ovarian serous carcinomas, limiting its PPV for breast carcinoma in effusions to 55% despite a negative predictive value of 97%. Conclusion: SOX17 is a highly specific confirmatory marker for Müllerian origin and may help resolve diagnostic pitfalls related to PAX8-positive mesothelial lesions. TRPS1 is a complementary marker for breast carcinoma, including GATA3-negative tumors, but its stand-alone diagnostic value is limited by cross-reactivity in Müllerian serous carcinomas. These findings support a panel-based approach for accurate primary-site attribution in malignant serous effusions.

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• ArticleYayıncıda açık erişim2026/r/ebyu/10191
  A Novel Protective Strategy Against Metformin-Induced Renal Injury Involving Adenosine Triphosphate and Thiamine Pyrophosphate

  Kocaturk, Huseyin; Bedir, Fevzi; Yavuzer, Bulent; Sezgin, Esra Tuba; Mammadov, Renad; Suleyman, Bahadir; Sarigul, Cengiz; Cimen, Ferda Keskin; Altay, Mehmet Sefa; Suleyman, Halis

  Metformin is widely used in type 2 diabetes, but its effects on oxidative and inflammatory pathways remain controversial. Beyond glycemic control, it may promote lactic acidosis by impairing mitochondrial metabolism and pyruvate flux. The potential renoprotective roles of adenosine triphosphate (ATP) and thiamine pyrophosphate (TPP) remain poorly defined. This study aimed to evaluate whether ATP and TPP mitigate metformin-induced renal injury through biochemical and histopathological assessments. Wistar rats were randomly divided into six groups: control, ATP, TPP, metformin, ATP + metformin, and TPP + metformin. Metformin (50 mg/kg, oral), ATP (4 mg/kg, intraperitoneal), or TPP (20 mg/kg, intraperitoneal) was administered daily for 10 days. Oxidative stress markers, inflammatory cytokines, renal histopathology, and serum creatinine, BUN, lactate, and LDH levels were evaluated. Metformin induced significant oxidative stress, inflammation, metabolic disturbance, and renal injury. ATP provided partial protection, whereas TPP markedly restored redox balance, reduced inflammation, and preserved renal histology. TPP confers superior protection against metformin-induced renal injury compared with ATP by modulating oxidative, inflammatory, and metabolic pathways, highlighting its therapeutic potential in preventing metformin-related nephrotoxicity.

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• ArticleYayıncıda açık erişim2025/r/ebyu/19369
  The Effects of Hyperı̇cum perforatum (St. John's Wort) Oil on Wound Healing and Comparison with Those of Collagenase Drugs

  Koç, Alparslan; Tayfur, Mahir; Huyut, Mehmet Tahir; Memiş, Ufuk; Kahraman, Ibrahim

  Background and Objectives: Wound healing is among the most fundamental problems in the field of health. Oil of Hypericum perforatum (HP) has been used for various ailments, particularly depression, burns, and wound healing, globally for a long period of time. We investigated the healing-promoting effect of HP oil on wound healing histopathologically and macroscopically in an experimental wound model in rats, aiming to compare the results with those of collagenase pomade, which is actively used in the literature. Materials and Methods: A total of 32 male Wistar rats of similar were used for the experiment. The animals were randomly divided into four groups, each consisting of eight rats. After the dorsal areas of the rats were shaved and disinfected with povidone-iodine solution, a 1 cm2 full-thickness wound was created on the backs of each rat. The sham (control) group received dry gauze dressings, while the physiological saline (PS) group was treated with saline-soaked gauze. The collagenase ointment pomade (CP) group and HP groups were treated with gauze impregnated with 0.1 grams of these substances. All wounds were dressed twice daily, in the morning and evening. The second group was treated with physiological saline. The third group was treated with collagenase ointment. And the fourth group was treated with St. John's Wort oil. Wound areas were measured on days 3, 7, 10, 14, and 21. In addition, histopathological evaluation was performed on tissue samples obtained on day 14, and the day of complete wound closure was recorded for each animal. Results: When the findings were statistically analyzed, wounds treated with St. John's Wort oil and collagenase ointment healed significantly faster than the other groups (p &lt; 0.05). Conclusions: In conclusion, St. John’s Wort oil appears to be a promising topical agent for enhancing wound healing, as it accelerates the healing process. However, controlled clinical trials in human subjects would provide the most definitive evidence on this topic.

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