TR-Dizin Açık Erişimli Yayınlar

Permanent URI for this collectionhttps://hdl.handle.net/11727/10759

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Author: search.filters.author.Tezcaner, Tugan

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    Diffusion-Weighted Imaging of Breast Cancer: Correlation of the Apparent Diffusion Coefficient Value with Pathologic Prognostic Factors
    (2019) Tezcan, Sehnaz; Uslu, Nihal; Ozturk, Funda Ulu; Akcay, Eda Yilmaz; Tezcaner, Tugan; 31620686; ABC-5258-2020
    Objective: The aim was to evaluate relationship between apparent diffusion coefficient (ADC) values with pathologic prognostic factors in breast carcinoma (BC). Materials and Methods: 83 patients were enrolled in this study. Prognostic factors included age, tumor size, expression of estrogen receptor (ER) and progesterone receptor (PR), human epidermal growth factor receptor 2 (HER2), nuclear grade (NG), lymph node involvement and histologic type. The relationship between ADC and prognostic factors was determined using Independent sample t-test, ANOVA, Pearson correlation and relative operating characteristics (ROC) analysis. Results: There was no significant difference between ADC and prognostic factors, including age, tumor size, ER, HER2 and histologic type. The PR-positive tumors (p=0.03) and axillary lymph node involvement (p=0.000) showed a significant association with lower ADC values. The ADC values were significantly lower in high-grade tumors than low-grade tumors (p=0.000). ROC analysis showed an optimal ADC threshold of 0.66 (x10-3 mm(2)/s) for differentiating low-grade tumors from high-grade tumors (sensitivity, 85.5%; specificity, 81%; area under curve, 0.90). Conclusion: The lower ADC values of BC were significantly associated with positive expression of PR, LN positivity and high-grade tumor. Especially, ADC values were valuable in predicting NG subgroups.
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    Exogenous Recombinant Adiponectin Improves Survival in Experimental Abdominal Sepsis
    (2014) Salman, Bulent; Yilmaz, Tonguc Utku; Tezcaner, Tugan; Demir, Ebru fluoglu; Pasaoglu, Ozge Tugce; 25337421
    Background: Adiponectin, which has anti-inflammatory features, is an important substance in several metabolic mechanisms. Aims: The aim of this study is to evauate the effects of exogenous intraperitoneal administration of adiponectin on the survival, intrabdominal adhesion and inflammatory cytokine levels in an experimental sepsis model. Study Design: Animal experimentation. Methods: Ninety rats were divided into a control group, adiponectin group and sham group. A cecal puncture abdominal sepsis model was performed in the adiponectin and control groups. Every three hours, exogenous adiponectin was administrated to the adiponectin group. At the 3(rd) and 24(th) hours, 10 rats were sacrified in each group in order to measure plasma tumor necrosis factor-alpha (TNF-alpha), interleukin (IL) 10, soluble intracellular adhesion molecule (ICAM)-1, IL-6 and macrophage inhibitory factor levels, and the activity of nuclear factor (NF)-kappa B. The remaining rats were followed for survival. Results: The plasma levels of TNF-alpha, soluable ICAM-1, IL-6, and macrophage inhibitory factor were significantly higher in the control group than in the adiponectin and sham group (p<0.05). The increase in inflammatory cytokines with time was more prominent in the control group. The activity of NF-kappa B in the control group was higher than in the adiponectin group (p<0.05). The survival rate of the adiponectin group was higher than in the control group. Conclusion: Administration of exogenous adiponectin to the peritoneum in abdominal sepsis increased survival and decreased intrabdominal adhesions by decreasing the inflammatory response.
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    EFFECTS OF LOWER GASTROINTESTINAL TRACT SURGERY ON SURVIVAL IN ELDERLY AND OCTOGENARIAN PATIENTS
    (2018) Aydin, Huseyin Onur; Avci, Tevfik; Tezcaner, Tugan; Karagulle, Erdal; Yildirim, Sedat; 0000-0003-3795-5794; 0000-0002-8522-4956; 0000-0002-3641-8674; 0000-0001-5225-959X; 0000-0002-5735-4315; S-8185-2018; C-6247-2017; AAD-9865-2021; AAF-1698-2021; AAF-4610-2019
    Introduction: Life expectancy has significantly increased in the last decade. The decision to perform surgery has always been challenging in elderly patients. We aimed to evaluate outcomes in patients who underwent surgery for lower gastrointestinal tract diseases and investigate factors influencing morbidity and mortality, particularly in octogenarian patients, and the effects of age on prognosis and survival in the postoperative period. Materials and Method: This study included patients aged >= 70 years who underwent lower gastrointestinal tract surgery; patients were divided into three groups as 70-75 years, 75-79 years, and >= 80 years. Age, gender, type of surgery, ASA score, length of hospital stay, morbidity, 30-day mortality, and overall survival were evaluated. Results: The surgery was performed to 598 patients due to lower gastrointestinal tract diseases. There was a significant increase in the ASA score with increasing age (Chi-square=35.472; p<0.001). The survival rate was significantly higher in patients with malignancies than in those with benign diseases, and in patients who underwent elective surgery than in those who underwent emergency surgery (p<0.001). When patients were examined according to age groups, the overall survival was similar across groups (p=0.217). Conclusion: There was no significant difference between octogenarian and younger patients for complications and survival. Thus, planned surgical interventions in elderly patients will not negatively affect survival and surgical interventions and can be safely performed in these patients.
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    Long-term and Perioperative Outcomes of Laparoscopic and Open Surgery for Rectal Cancer
    (2018) Aydin, Huseyin Onur; Ekici, Yahya; Karakayali, Feza Yarbug; Tezcaner, Tugan; Ozgun, Gonca; Yildirim, Sedat; Moray, Gokhan
    Objectives: The necessity of comparing oncologic results with the use of minimally invasive surgery in rectal cancer has arisen. The aim of the present study was to evaluate the treatment approach in rectal cancer and to compare the outcomes of laparoscopic and open surgery. Methods: Patients who underwent surgery for rectal carcinoma between January 2006 and January 2016 in our institution were evaluated. The results were compared between the two groups according to open or laparoscopic surgery. Clinical characteristics, preoperative and postoperative results, pathological examination results, and disease-free survival rates were compared after the surgical procedure. Results: A total of 121 patients were included in the study. Of the patients, 50 underwent open, and 71 underwent laparoscopic surgery. The median follow-up times were 56.75 months in the open surgery group and 55.2 months in the laparoscopic surgery group. Pathological examination revealed similar numbers of lymph nodes in both groups (p>0.05). The duration of hospital stay was statistically significantly lower in the open surgery group than in the laparoscopic group (p<0.05). The rates of disease-free survival were 74% in the open surgery group and 82.5% in the laparoscopic group, and no statistically significant difference was found (p>0.05). Conclusion: There was no significant difference in complication and recurrence between laparoscopic and open surgery for rectal cancer in our study. The duration of hospital stay of patients was statistically significantly lower in the laparoscopic group than in the open surgery group. Laparoscopic or open surgical options could be preferred according to the clinical suitability of the patient, experience of the surgeon, and resources of the center in rectal cancer treatment.