Ozgur Kemik
Yüzüncü Yıl University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Ozgur Kemik.
World Journal of Surgical Oncology | 2010
Ozgur Kemik; Aziz Sümer; Ahu Sarbay Kemik; Ismail Hasirci; Sevim Purisa; Ahmet Cumhur Dulger; Baris Demiriz; Sefa Tuzun
BackgraundAcute-phase response proteins (APRP), cytokines and hormones have been claimed to be an independent prognostic factor of malignancies, however the basis for their association with prognosis remains unexplained. We suggest that in colon malignancies, as similar to pancreatic and lung cancers, changes in APRP are associated with angiogenesis.MethodsC-reactive protein (CRP), albumin, IL-1α, IL-1β, IL-6, IL-8, IL-10, TNF-α, midkine, VEGF-A, VEGF-C, leptin, adiponectin, and ghrelin serum levels are studied in 126 colon cancer patients and 36 healthy subjects.ResultsWe found statistically significant difference and correlations between two groups. We found significantly higher serum CRP, IL-1α, IL-1β, IL-6, IL-8, IL-10, TNF-α, VEGF-A, VEGF-C and leptin concentrations in patients relative to controls (p < 0.001). We found lower levels of the serum albumin, midkine, adiponectin and ghrelin in patients compared to control subjects (p < 0.001).ConclusionsCachexia in patients with colon cancers is associated with changes in APRP, cytokines and hormone concentrations. These biomarkers and cachexia together have a direct relationship with accelerated angiogenesis. This may lead to a connection between the outcomes in malignancies and the biomarkers.
Human & Experimental Toxicology | 2012
Ozgur Kemik; Ahu Sarbay Kemik; Huseyin Begenik; Fm Erdur; Habib Emre; Aziz Sümer; Sevim Purisa; Sefa Tüzün; C Kotan
Background: Acute-phase response proteins (APRPs), cytokines, and hormones have been claimed to be an independent, important factor of cancers. We suggest that in gastrointestinal system cancers, changes in APRP, cytokines, and hormones are associated.Methods: C-reactive protein (CRP), albumin, interleukin 1α (IL-1α), IL-1β, IL-6, IL-8, IL-10, tumor necrosis factor α (TNF-α), midkine, vascular endothelial growth factor-A(VEGF-A), VEGF-C, VEGF receptor 1 (VEGFR1), leptin, adiponectin, and ghrelin serum levels are studied in 148 gastrointestinal system cancer types and 40 healthy controls.Results: We found statistically significant differences and correlations between groups. We found significantly higher serum CRP, IL-1α, IL-1β, IL-6, IL-8, IL-10, TNF-α, VEGF-A, VEGF-C, VEGFR1, and leptin concentrations in patients with esophageal, gastric, pancreas, colon, and rectum cancers than controls (p < 0.001, p < 0.0001). But, we found lower levels of the serum albumin, midkine, adiponectin, and ghrelin in patients with esophageal, gastric, pancreas, colon, and rectum cancers compared to control subjects (p < 0.05, p < 0.001).Conclusions: Cachexia in gastrointestinal system cancer types is associated with changes in APRP, cytokines, and hormone concentrations. This may be reflected between the outcomes in malignancies and the biomarkers.
World Journal of Gastroenterology | 2011
Ozgur Kemik; Ahu Sarbay Kemik; Aziz Sümer; Ahmet Cumhur Dulger; Mine Adas; Huseyin Begenik; Ismail Hasirci; Özkan Yılmaz; Sevim Purisa; Erol Kisli; Sefa Tuzun; Çetin Kotan
AIM To evaluate the levels of preoperative serum matrix metalloproteinase-1 (MMP-1) and tissue inhibitor of metalloproteinase-1 (TIMP-1) in gastric cancer. METHODS One hundred gastric cancer patients who underwent gastrectomy were enrolled in this study. The serum concentrations of MMP-1 and TIMP-1 in these patients and in fifty healthy controls were determined using an enzyme-linked immunosorbent assay. RESULTS Higher serum MMP-1 and TIMP-1 levels were observed in patients than in controls (P < 0.001). Serum MMP-1 and TIMP-1 levels were positively associated with morphological appearance, tumor size, depth of wall invasion, lymph node metastasis, liver metastasis, perineural invasion, and pathological stage. They were not significantly associated with age, gender, tumor location, or histological type. CONCLUSION Increased MMP-1 and TIMP-1 were associated with gastric cancer. Although these markers are not good markers for diagnosis, these markers show in advanced gastric cancer.
Diagnostic and interventional radiology | 2012
Serhat Avcu; Feray Çetin; Halil Arslan; Ozgur Kemik; Ahmet Cumhur Dulger
PURPOSE We aimed to evaluate the effectiveness of diffusion-weighted magnetic resonance imaging (DW-MRI) and apparent diffusion coefficient (ADC) values in the diagnosis of acute appendicitis and differentiation of perforated and nonperforated appendicitis cases, with histopathologic correlation. MATERIALS AND METHODS Sixty consecutive patients (34 males, 26 females; mean age, 35.6±15.5 years; range, 17-83 years) with a presumptive diagnosis of acute appendicitis were included in this prospective study. With a 1.5 Tesla MRI unit, DW-MRI examinations were performed with b values of 50, 400, and 800 s/mm(2). The mean ADC values of case and control groups, as well as in perforated and nonperforated groups were compared. RESULTS Of the 60 cases, 44 had a radiological diagnosis of acute appendicitis, and 16 were regarded as normal. Of the 40 patients who underwent surgical operation, 12 had a histopathological diagnosis of perforated appendicitis, and 28 had nonperforated appendicitis. Mean ADC value in patients with acute appendicitis (1.01±0.26×10(-3) mm(2)/s) was lower than the control group (1.85±0.13×10(-3) mm(2)/s) (P < 0.001). Mean ADC value of the perforated group (0.79±0.19×10(-3) mm(2)/s) was lower than the nonperforated group (1.11±0.22×10(-3) mm(2)/s) (P < 0.001). The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy rate of DW-MRI in the diagnosis of acute appendicitis were 97.5%, 100%, 97.5%, 100%, and 98.1%, respectively. CONCLUSION DW-MRI and ADC quantification are effective in the diagnosis of acute appendicitis, both in perforated and nonperforated cases.
International Journal of Surgery | 2011
Gokhan Adas; Askın Percem; Mine Adas; Ozgur Kemik; Soykan Arikan; Duran Ustek; Aris Cakiris; Neslihan Abaci; Ahu Sarbay Kemik; Gulcin Kamali; Servet Karahan; Adem Akcakaya; Oguzhan Karatepe
BACKGROUND Reducing ischemic damage is one of the goals of surgery. The aim of this study was to apply human VEGF-A and FGF-2 DNA-mediated gene therapy in order to identify their effects in the healing of ischemic colon anastomoses and eliminating the negative effects of ischemia. METHODS Forty male Wistar albino rats weighing 250-280 g were divided into five equal groups (n = 8) as follows: group 1: control, ischemic left colonic anastomosis; group; 2: ischemic left colonic anastomosis with control plasmid delivery; group 3: ischemic left colonic anastomosis with VEGF plasmid delivery; group 4: ischemic left colonic anastomosis with FGF plasmid delivery; group 5: ischemic left colonic anastomosis with VEGF and FGF plasmid delivery. All rats were sacrificed on the 4th postoperative day. Anastomosis burst pressures were measured for mechanical examination of anastomosis. Tissue hydroxyprolin, VEGF and FGF levels were determined as biochemical parameters. Necrosis, epithelisation, inflammatory processes, fibroblastic activity, collagen deposition and neovascularisation at the anastomic site were studied. RESULTS VEGF, FGF and combined therapy significantly accelerated many of the histological parameters of healing, including fibroblast activation, collagen deposition, and angiogenesis, and augmented the levels of hydroxyproline and bursting pressure. CONCLUSIONS This is the first study to use gene therapy with growth factors for the healing of ischemic colonic anastomosis. This therapy can be effectively used in increasing ischemic anastomosis wound healing.
World Journal of Surgical Oncology | 2010
Ozgur Kemik; Aziz Sümer; Ahu Sarbay Kemik; Veyis Itik; Ahmet Cumhur Dulger; Sevim Purisa; Sefa Tuzun
BackgroundThe incidence of hepatocellular cancer in complicated alcoholic and non-alcoholic fatty liver diseases is on the rise in western countries as well in our country. Vascular adhesion protein-1 (VAP-1) levels have been presented as new marker. In our study protocol, we assessed the value of this serum protein, as a newly postulant biomarker for hepatocellular cancer in patients with a history of alcoholic and non-alcoholic fatty liver diseases.MethodsPre-operative serum samples from 55 patients with hepatocellular cancer with a history of alcoholic and non-alcoholic fatty liver diseases and patients with cirrhosis were assessed by a quantitative sandwich ELISA using anti-VAP-1 mAbs. This technique is used to determine the levels of soluble VAP-1 (sVAP-1) in the serum.ResultssVAP-1 levels were evaluated in patients with hepatocellular cancer and liver cirrhosis. There was a significant difference in mean VAP-1 levels between groups. Serum VAP-1 levels were found higher in patients with hepatocellular cancer.ConclusionThese findings indicate that the serum level of sVAP-1 might be a beneficial marker of disease activity in chronic liver diseases.
Human & Experimental Toxicology | 2013
Ozgur Kemik; Ahu Sarbay Kemik; Aziz Sümer; Huseyin Begenik; Sevim Purisa; Sefa Tüzün
Objective. Biological levels of localized colon tumors are needed for the diagnosis and prevention of colon cancer. Numerous biomarker studies are produced currently through research. We investigated some peptides with the aim of identifying biomarkers for colorectal cancer and lymphatic and hepatic metastasis. Materials and methods. A total of 100 patients with histologically proven colorectal cancer and 60 normal volunteers were included in this study. Preoperative serum was collected for analysis. Human neutrophil peptides levels (HNP) were assayed by solid phase RIA (Radio Immun Assay) based on monoclonal antibodies. Results. The HNP-1, -2 and -3—also known as α-defensin-1, -2 and -3—are present in elevated concentrations in the plasma from colorectal cancer patients. Conclusion. Preoperative high plasma HNP 1–3 levels are associated with colorectal cancer. The HNP 1–3 levels may procure information on patients with lymph node or hepatic metastasis.
Case Reports in Medicine | 2010
Aziz Sümer; M. Ali Çarparlar; Ömer Uslukaya; Vedat Bayrak; Çetin Kotan; Ozgur Kemik; Ümit İliklerden
We report on a case of gossypiboma. A 54-year-old woman was admitted to our hospital with abdominal mass. She had undergone a caesarean operation 23 years previously. The mass in the right abdominal quadrant was suspected by abdominal computed tomography and magnetic resonance imaging. The mass was removed by laparotomy excision and the final diagnosis was gossypiboma.
Clinical medicine insights. Case reports | 2014
Hüseyin Yüce Bircan; Bora Koc; Umit Ozcelik; Ozgur Kemik; Alp Demirag
Gallstone ileus is a rare complication of cholelithiasis that has high morbidity and mortality. An intestinal obstruction can be caused by migration of a large gallstone through a biliary enteric fistula or by impaction within the intestinal tract. In this study, we present the case of an 81-year-old woman with a mechanical bowel obstruction by a gallstone that was treated by laparoscopy.
Case Reports in Medicine | 2010
Aziz Sümer; Ozgur Kemik; Aydemir Olmez; A. Cumhur Dulger; Ismail Hasirci; Ümit İliklerden; Erol Kisli; Çetin Kotan
Meckels diverticulum is the most common congenital anomaly of the small intestine. Common complications related to a Meckels diverticulum include haemorrhage, intestinal obstruction, and inflammation. Small bowel obstruction due to mesodiverticular band of Meckels diverticulum is a rare complication. Herein, we report the diagnosis and management of a small bowel obstruction occurring due to mesodiverticular band of a Meckels diverticulum.