Umut Tüysüz

Dr. Umut Tüysüz


Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 January 2021 in Asian Journal of Surgery
Verified
Journal Article
Open access
UTUmut Tüysüz
Umut Tüysüz
HAHıkmet Aktas
Hıkmet Aktas
IBImam Bakır Batı
Imam Bakır Batı
RERemzi Emıroglu
Remzi Emıroglu
Liver transplantation remains the only curative treatment in end stage liver disease. Biliary complications remain the most common major morbidity causes in hepatic resection. We aimed to determine and eliminate the bile leakage in donor hepatectomy of LDLT. This study was conducted retrospective and one center study. The study population included 110 consequential liver donors with major liver resection (more than three segments). The population was divided into three groups for data analyses. Primary study groups included 40 donors subjected to methylene blue test starting in April 2013 and 40 donors subjected to intraoperative cholangiography started in March 2014. A total of 110 liver donors (42.7% women) were included in the study. Postoperative biliary complications were less in methylene blue and intraoperative cholangiography (IOC) groups. Bile leakage was significantly higher in control group (23.3%) compared to methylene blue (5%) and IOC groups (2%) Average duration of hospital stay and duration of operation were significantly higher in control group compared to methylene blue and IOC groups. In our study we conducted to establish biliary leakage in living donor hepatectomy which intraoperative cholangiography test was used to determine. Many intraoperative methods have been introduced to prevent biliary leakage and development of complications. We have showed that IOC test used in the present study could be easily applied in both living liver donor hepatectomy and other major hepatectomy cases. IOC test reduced postoperative biliary leakage incidence and did not increase incidence of other complications.

16 August 2025 in Current Oncology
Verified
Journal Article
Open access
PDF file
IBImam Batı
Imam Batı
UTUmut Tüysüz
Umut Tüysüz
EEElif Eygi
Elif Eygi
Objectives: Hepatocellular carcinoma (HCC) remains a major indication for liver transplantation (LT), but accurate pretransplant risk stratification is critical to improve long-term outcomes. Traditional morphometric criteria such as tumor size and number are limited in predicting recurrence and survival. The HALP (hemoglobin, albumin, lymphocyte, platelet), gamma-glutamyl transpeptidase to platelet ratio (GPR), and FIB-4 indices are emerging systemic inflammatory and nutritional biomarkers that may provide additional prognostic value in HCC patients undergoing LT. Materials and Methods: This retrospective, two-center cohort study included 200 patients who underwent LT for HCC between 2012 and 2023. Preoperative HALP, GPR, and FIB-4 scores were calculated, and their associations with overall survival (OS) and recurrence-free survival (RFS) were assessed using ROC analyses and Cox proportional hazard models. Cut-off values were determined for each biomarker, and survival outcomes were analyzed using Kaplan–Meier methods. Results: A low HALP score (≤0.39) was independently associated with reduced OS but not with RFS. Conversely, low GPR (≤0.45) and FIB-4 (≤3.1) values were significantly associated with both poor OS and higher recurrence risk. Tumor size, number of lesions, and microvascular invasion also independently predicted poor outcomes. Multivariate analysis confirmed HALP, GPR, and FIB-4 as significant preoperative predictors of prognosis in this population. Conclusions: HALP, GPR, and FIB-4 are readily available, cost-effective indices that provide significant prognostic information in HCC patients undergoing LT. Their integration with morphometric criteria may improve pretransplant risk stratification and support individualized clinical decision-making.

22 August 2024 in Frontiers in Oncology
Verified
Journal Article
Open access
PDF file
IBImam Bakır Batı
Imam Bakır Batı
UTUmut Tüysüz
Umut Tüysüz
Background: Hepatocellular cancer (HCC) is the most common primary liver cancer with increasing incidence. Liver transplantation (LT) has been accepted as main curative liver cancer treatment. The effectiveness of LDLT as opposed to Deceased Donor Liver Transplant (DDLT) for patients with HCC is still controversial. There is limited data comparing the long-term outcomes of patients undergoing LDLT or DDLT for HCCs that do not meet the Milan criteria.Methods: We aimed to compare the perioperative and survival outcomes of LDLT with DDLT in HCC patients.Patients underwent LT between January 2012 and December 2020 were retrospectively analyzed. There were 137 patients who met the UCSF criteria. Of these, 75 patients received LDLT and 62 patients DDLT.The primary end points in the present study were oncologic outcomes such as the recurrence rate, disease-free survival (DFS) and overall survival (OS) of LDLT and DDLT in patients with HCC.Results: PET-CT SUVmax value, the amount of erythrocyte solution (ES) as blood transfusion of red cells given and the tumor recurrence rate were significantly higher among the deceased patients recurrence, ES, PET-CT SUVmax value and tumor differentiation had significant effects on survival. In the multivariate reduced model, cox regression analysis showed significant effects of recurrence, ES, locoregional treatment response and PET-CT on survival.Albeit not significant, the one-year recurrence rate in the LDLT was similar to that in the DDLT, three- and five-year recurrence rates were higher in DDLT compared to LDLTConclusion: There is less chance of cold ischemia time and better-quality grafts with minimal fatty changes, lower recurrence rates and similar survival rates can be achieved in LDLT compared to DDLT

23 February 2021 in Experimental and Clinical Transplantation
Verified
Journal Article
Closed access
UTUmut Tüysüz
Umut Tüysüz
RERemzi Emiroğlu
Remzi Emiroğlu
A correct preoperative definition of the hepatic duct confluence anatomy of right liver living donors is pivotal in determining their candidacy for donation and planning surgery during liver transplant. Here, we evaluated the accuracy of 3-dimensional magnetic resonance cholangiography compared with intraoperative cholangiography in assessing biliary anatomy and aimed to identify imaging characteristics that may help to predict the yield of hepatic duct orifices in the right liver graft. All consecutive living hepa-tectomy donors for adult liver transplant included in this study (N = 110) were evaluated with preoperative 3-dimensional magnetic resonance cholangiography, which was performed before and after intravenous administration of gadolinium (20-40 cm³). For intraoperative cholangiography, a 4F catheter was advanced through the cystic duct, and contrast matter (5-10 mL) was injected into the biliary tree via the catheter. The number of right hepatic ducts in explanted graft was determined on the back table. Of 110 donors, 71 had type 1 (normal) biliary anatomy based on both 3-dimensional magnetic resonance and intraoperative cholangiography and 39 had abnormal biliary anatomy, with 2 having type 3 (abnormal) biliary anatomy. Normal biliary anatomy was found in back-table examination, and abnormal biliary anatomy (type 2) was found with intraoperative cholangiography. Sensitivity, specificity, and predic-tive values of 3-dimensional magnetic resonance cholangiography in revealing the biliary anatomy and anomalies were compared with intraoperative cholangiography findings. Observed final hepatic duct outcomes were also assessed. Use of 3-dimensional magnetic resonance cholangiography accurately predicted the biliary anatomy in 97 of 110 cases. Sensitivity was 80.4%, positive predictive value was 94.4%, specificity was 96.9%, and negative predictive value was 87.3%. Three-dimensional magnetic resonance cholangiography reliably represented normal biliary anatomy; the presence of anatomic variations decreased its sensitivity, making intraoperative cholangiography or duct probing necessary tools to accurately perform right hepatic duct transection.

27 December 2024 in Harran Üniversitesi Tıp Fakültesi Dergisi
Verified
Journal Article
Open access
PDF file
UTUmut Tüysüz
Umut Tüysüz
OYOrhan Yalçın
Orhan Yalçın
Background: Pilonidal sinus disease (PSD) encompasses inflammation localized to the intergluteal cleft, ranging from minor cyst to extensive sinus formation. The most important parameters in the treatment of the disease are early return to work, low recurrence rate, low postoperative pain, high comfort, low complication rate, and low cost. In the surgical treatment of pilonidal sinus disea-se, there are methods such as flap methods, primary closure, and unroofing and curettage. Materials and Methods: This study was planned as a prospective randomized clinical trial with pati-ents who were operated with the diagnosis of chronic pilonidal sinus. A total of 104 chronic piloni-dal sinus patients were randomized into two groups. The first group underwent Limberg flap proce-dure for treatment. The second group underwent adipofascial flap procedure for treatment. The two groups were compared in terms of demographic characteristics, duration of surgery, early and late complications, recurrence, and follow-up time. Results: The operation time was shorter in Group 2 than in Group 1. The difference was statistically significant. Wound dehiscence was significantly less common in Group 2. The aesthetic satisfaction was significantly higher in Group 2. Recurrence rates were not different between the Limberg and adipofascial groups (49/4 and 55/4, 8% and 7%, respectively). Conclusions: Our study showed that the adipofascial flap can be easily applied in the surgical treat-ment of pilonidal sinus disease and has no difference from other flap methods. To minimize regret for surgical decisions, people with PSD need better information on the burden of wound care and the risks of recurrence associated with different surgical approaches.

22 July 2024
Verified
Book Chapter
Open access
PDF file
UTUmut Tüysüz
Umut Tüysüz
Hepatocellular carcinoma (HCC) is the sixth most common cancer worldwide. It has the third most common cancer-related death. Here, there are different treatment options for HCC that develops on cirrhosis background. These include liver resection, liver transplantation (LT), locoregional therapy (LRT), and systemic therapy. LT is an effective treatment choice for eligible patients who provide excellent posttransplant outcomes with a low risk of HCC recurrence, especially when strict patient selection criteria and appropriate posttransplant management are applied. Different selection criteria have been proposed for LT candidates in recent years. The use of these criteria also allows for recurrence rates that can be achieved at acceptable rates. These models continue to evolve and incorporate features such as tumor biology in addition to the response to LRT as efforts to identify patient populations that may benefit more from LT by expanding access to it. Milan criteria were considered the gold standard for LT. Post-LT HCC recurrence is among the leading causes of death in patients transplanted for this indication. Posttransplant HCC surveillance is important in this regard. Early diagnosis and aggressive treatment have been proven to improve survival outcomes.