Publications by authors named "Ozgen Isik"

The overall survival of patients with the advanced and recurrent gastric cancer (GC) remains unfavorable. In particular, this is due to cancer spreading and resistance to chemotherapy associated with the epithelial-mesenchymal transition (EMT) of tumor cells. EMT can be identified by the transcriptome profiling of GC for EMT markers.

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Various clinicopathological, radiological, and molecular parameters are predictive of prognosis in patients with colorectal carcinoma and distant organ metastases continue to have a significant place among them. Recent studies reveal that not only the presence of metastases but also the histopathological growth pattern of the metastatic tumor significantly affects prognosis. This study aimed to investigate the prognostic significance of the histopathological growth patterns of metastatic tumors, the morphological findings in the peritumoral non-neoplastic liver, and its relationship with survival in patients who have metastatic colorectal carcinoma.

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Objectives: In our study, it was aimed to evaluate the factors affecting oncological outcomes in resections for rectal cancer.

Material And Methods: Between January 2010 and December 2014, patients with rectal tumors were analyzed retrospectively. Demographic and pathological data and oncological outcomes were analyzed as disease-free survival, overall survival, and local recurrence.

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Objectives: Bariatric and metabolic surgery (BMS) is the most effective treatment method of morbid obesity. Optimum education of medical students regarding BMS is important for proper assessment of morbidly obese patients in the future.

Material And Methods: Medical students from five and six years were determined as the targeted study population.

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Background: Breast cancer is a heterogeneous disease and differences in the expression levels of the ER, PR, and HER2 the triplet of established biomarkers used for clinical decision-making have been reported among breast cancer patients. Furthermore, resistance to anti-estrogen and anti-HER2 therapies emerges in a considerable rate of breast cancer patients, and novel drug therapies are required. Several anomalous signaling pathways have been known in breast cancer have been known; heat shock protein 90 (HSP90) is one of the most plenty proteins in breast cells.

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Solid pseudopapillary tumor (SPT) of the pancreas is an uncommon pathological condition. It is classified as low-grade malignant neoplasm, but aggressive disease can be seen when the tumor size is larger than 5 cm, microscopic malignant features and local invasion are present. Resection of the mass with clear margins is the procedure of choice.

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Background: Ablation of anal fistula tract using a radial laser-emitting probe is a sphincter-preserving technique.

Objective: The purpose of this study was to assess long-term outcomes of laser ablation of fistula tract.

Design: This was a retrospective analysis of the long-term outcomes of 100 patients who underwent laser ablation of fistula tract.

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Background/aims: Patients with colorectal cancer continue to present with relatively advanced tumors that are associated with poor oncological outcomes. The aim of the present study was to assess the association between localization, symptom duration, and tumor stage.

Materials And Methods: A prospective, multicenter cohort study was conducted on patients newly diagnosed with a histologically proven colorectal adenocarcinoma.

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Introduction: In contrast to colorectal cancer patients, the effect of anastomosis leakage following pancreatic adenocarcinoma surgery on survival and recurrence rate is not clear. The present study aimed to determine the effect of pancreaticojejunostomy (PJ) anastomosis leakage, especially on the local recurrence rate and time of recurrence, in patients that underwent pancreaticoduodenectomy (PD) for pancreatic adenocarcinoma.

Materials And Methods: This retrospective study included 64 pancreatic adenocarcinoma patients that underwent PD between January 2007 and August 2015.

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Objective: The incidence of colorectal cancer becomes higher among octogenarians as the life expectancy increases. Whether advanced age is a risk factor for colorectal surgery is a matter of debate. In the present study, the clinical results of octogenarians who underwent colorectal cancer surgery are discussed to find an answer to this question.

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Purpose: The role of omentoplasty in the prevention of anastomotic leak (AL) in colorectal surgery is controversial. The aim of this study was to evaluate the impact of omentoplasty on AL and septic complications after low pelvic anastomosis using the American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) database.

Methods: The ACS-NSQIP database was queried for patients who underwent segmental colectomy with low pelvic anastomosis by using 2012 targeted colectomy participant use data file.

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Purpose: Hand-assisted laparoscopic colectomy (HALC) and laparoscopic-assisted colectomy (LAC) have been shown to have comparable short-term outcomes while there are limited data regarding costs. The aim of our study was to compare the short-term outcomes and costs of HALC and LAC.

Materials And Methods: In total, 46 patients who underwent HALC or LAC for benign or malignant disease between January 2011 and December 2014 at our institution were included in the study.

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Background: Colonoscopy in patients with diverticulosis can be technically challenging and limited data exist relating to the risk of post-colonoscopy diverticulitis. Our aim was to evaluate the incidence, management, and outcomes of acute diverticulitis following colonoscopy.

Methods: Study design is retrospective cohort study.

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Objectives: Periampullary region tumors (PRTs) are the fifth highest cause of cancer-related deaths worldwide. Although recent studies have highlighted the prognostic value of the long noncoding RNA HomeoboxA transcript at the distal tip (HOTTIP) in patients with pancreatic ductal adenocarcinoma, the relationship between HOTTIP and clinical outcome of all PRTs remains obscure. The aim of this study was to clarify the prognostic significance of HOTTIP in patients with all PRTs related to KRAS mutational status.

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Background: Fournier's gangrene (FG) is a devastating disease that is characterized by necrotizing fasciitis of the perineal, genital, or perianal region. Broad-spectrum antibiotics are the key component of its treatment. However, there is paucity of data regarding the optimal empirical antibiotherapy for FG.

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Background: Female gender is accepted as a poor prognostic factor for Fournier's gangrene (FG). However, there is a paucity of data in the literature regarding this matter. This case-matched study was designed to investigate the impact of gender on outcomes of FG.

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Introduction: The aim of this study was to compare early laparoscopic cholecystectomy (LC) and LCs performed at different time intervals for treatment of acute cholecystitis, contribute to the literature with data obtained from different centers, and provide assistance to clinicians about the timing of LC in acute cholecystitis.

Materials And Methods: The study was designed as a retrospective, observational, and multicentered study. The data of 470 patients who had undergone LC for treatment of acute cholecystitis between January 2010 and March 2016 were included.

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Aim: To report our experience on management of colorectal neoplasia during pregnancy and in the postpartum period.

Methods: Patients who were diagnosed with colorectal cancer during pregnancy or in the postpartum period (< 6 mo), between 8/1997 and 4/2013, in our department were reviewed. Patient characteristics, operations, fetal health and follow-up during pregnancy, type of delivery and oncologic outcomes were analyzed.

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Background: Splenectomy after combined colosplenic trauma or iatrogenic splenic injury during colorectal surgery associates with worse short- and long-term outcomes, including reduced survival in patients with colorectal cancer. Splenic autotransplantation may improve the outcomes of such patients. Omental splenic transplantation is the standard procedure but may be difficult when performing laparoscopic colorectal surgery or when total or subtotal omentectomy is required.

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Robotic surgery is an emerging field in colorectal surgery and may overcome the limitations of conventional laparoscopic surgery, such as rigid instrumentation, poor ergonomics, and assistant-dependent camera movements and retraction. In addition, robotic-assisted colectomy appears to offer comparable outcomes to laparoscopic colectomy with limited long-term outcomes data. Prolonged operating time, increased costs and learning curve are the major drawbacks of robotic colectomy for colon cancer.

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Purpose: Perianal Paget's disease is a rare intraepithelial adenocarcinoma of the perianal skin and the second most common localization of extramammary Paget's disease. This study was designed to evaluate long-term outcomes in patients with perianal Paget's disease.

Methods: We identified patients who were treated for perianal Paget's disease between 1981 and 2013.

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Background: There are several studies regarding risk factors affecting surgical site infections (SSIs); nevertheless, there are an insufficient number of studies focusing on risk factors for SSI in hepatobiliary (HPB) surgery. In this study, we aimed to determine risk factors related to HPB surgery.

Methods: A total of 1,418 patients were included in this study, all of whom underwent hepatobiliary system surgery in a five-year period between January 2005 and December 2009.

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Background: Fournier's gangrene (FG) is a devastating and potentially fatal disease requiring prompt and aggressive debridement. In this study, it was aimed to assess the predictors of mortality in a large cohort.

Methods: Prospectively maintained data of patients with FG were analyzed.

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Background And Aims: Ulcerative colitis can develop during the reproductive years, and there are limited data about perinatal care for patients with ulcerative colitis. In this study, we analyzed perinatal follow-up, complications, and maternal and fetal outcomes in pregnant patients undergoing surgery for ulcerative colitis.

Methods: Between January 1998 and July 2013, female patients who underwent surgery during pregnancy for abdominal complications of ulcerative colitis and followed up during their pregnancy in our institution were included in our study.

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Purpose: The aim of this study is to determine if resident involvement in a large cohort of laparoscopic colorectal surgery (LCS) cases negatively impacts outcomes and ultimately increases costs.

Methods: The American College of Surgeons National Surgical Quality Improvement Program database was queried for patients who underwent LCS between 2005 and 2010. Patients were classified into two groups: postgraduate year (PGY; resident involvement) or Attending Only.

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