Yildiray Yuzer

Group Florence Nightingale Hastaneleri, İstanbul, Istanbul, Turkey

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Publications (62)134.08 Total impact

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    DESCRIPTION: Survival rates for patients with HCC that were beyond conventional selection criteria should encourage reconsidering the acceptable thresholds of these criteria so that more HCC patients may undergo LT without affecting outcomes.
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    ABSTRACT: The right lobe of the liver is generally preferred for living donor liver transplantation in adult patients with end-stage liver disease. It is important to know the preoperative factors relating to the major postoperative complications. We therefore evaluated the possible risk factors for predicting postoperative complications in right lobe liver donors. Data from 378 donors who had undergone right lobe hepatectomy at our center were evaluated retrospectively. The factors we evaluated included donor age, gender, body mass index (BMI), remnant liver volume, operation time, history of previous abdominal surgery, inclusion of the middle hepatic vein and variations in the portal and bile systems. Of the 378 donors, 219 were male and 159 female. None of the donors died, but 124 (32.8%) donors experienced complications including major complications (Clavien scores III and IV) in 27 (7.1%). Univariate analysis showed that complications were significantly associated with male gender and higher BMI (P<0.05), but not with donor age, remnant liver volume, operation time, graft with middle hepatic vein, variations in the portal and bile systems and previous abdominal surgery (P<0.05). Multivariate logistic regression analysis showed that major complications were significantly associated with male gender (P=0.005) and higher BMI (P=0.029). Moreover, the Chi-square test showed that there were significant relationships between major complications and male gender (P=0.010, X2=6.614, df=1) and BMI >25 kg/m2 (P=0.031, X2=8.562, df=1). Of the 96 male donors with BMI >25 kg/m2, 14 (14.6%) with major complications had significantly smaller mean remnant liver volume than those (82, 85.4%) without major complications (32.50%+/-4.45% vs 34.63%+/-3.11%, P=0.029). Male donors with BMI >25 kg/m2 and a remnant liver volume ≤32.50% had a significantly increased risk for major complications.
    Hepatobiliary & pancreatic diseases international: HBPD INT 04/2015; 14(2):150-6. DOI:10.1016/S1499-3872(15)60346-0 · 1.17 Impact Factor
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    ABSTRACT: Previous published studies have shown that age is not a contraindication for deceased donor liver transplantation. The data about elderly recipient after living donor liver transplantation (LDLT) is unsatisfactory. The aim of this study was to evaluate the outcome of the LDLT with recipients aged 70 years or older. Between 2005 and 2013, 469 patients underwent LDLTs. The clinical characteristics, preoperative, intraoperative, and postoperative data, graft, and patients' survival of these patients were retrospectively analyzed. All recipients who were 70 years or older at the time of liver transplantation were indentified. The results were compared to the results of the patients younger than 70 years. There were 12 patients (2%) 70 years or older. All patients received the right lobe of their donor in a standard technique. One patient died postoperatively because of pulmonary infection, and one patient died 6 months after the operation because of graft failure after cardiac infarction. The comorbidity score of these two patients were significantly higher compared to the other ten patients without any complications (8.5 vs. 4.6, P=0.01). The 1-year and 3-year patient and graft survival was 84%. There were no significant differences in complications, hospital stay, perioperative mortality, or median survival compared to the younger group. Although the number of the patients is small, our study emphasizes that LDLT of patients 70 years or older can be performed safely in patients without major comorbidities. Elderly patients with increased risk for postoperative complications should be excluded from LDLT.
    Transplantation 01/2015; Online First. DOI:10.1097/TP.0000000000000524 · 3.78 Impact Factor
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    ABSTRACT: Echinococcus alveolaris is a parasite from tenia family which causes tumor-like lesions in the livers of infected people. If it is not diagnosed in the early stage of the disease, it frequently causes multiple cysts in the liver. The clinical importance of the disease is rapid progression, infiltration into different tissues like a malignant tumor and capacity of creating metastatic masses. The disease could be treated either by surgical resection or liver transplantation. The resection of the cystic disease is the preferred treatment method. In cases where resection is not possible, liver transplantation is the choice of treatment. Here we present three cases which were admitted to the hospital with unresectable hepatic alveolar echinococcosis and treated by liver transplantation successfully. Patients for whom surgical resection is not possible, we recommend liver transplantation as the treatment method.
    Hepato-gastroenterology 01/2015; 62(137):93-7. · 0.91 Impact Factor
  • A. Saracoglu · F. Yuzer · L. Oklu · E. Yentur · Y. Tokat · Y. Yuzer
    European Journal of Anaesthesiology 06/2014; 31:19. DOI:10.1097/00003643-201406001-00052 · 3.01 Impact Factor
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    ABSTRACT: Living donor liver transplantation (LDLT) is an accepted option for end-stage liver disease, particularly in countries in which there are organ shortages. However, little is known regarding LDLT for obese patients. We sought to determine the effects of obesity on pre-transplant living donor selection for obese recipients and their outcomes. Based on BMI values, 148 patients were classified as normal (N), 148 were overweight (OW), and 74 were obese (O). Obese recipients had significantly greater BMI values and received larger actual grafts than recipients with normal BMI values (32.1 ±1.6 kg/m(2) vs. 23.2 ± 1.9 kg/m(2) , p < 0.0001, and 918.9 ± 173.7 gm vs. 839.4 ± 162 gm, p = 0.002). Donors who donated to obese recipients had a greater mean BMI than those who donated to N recipients (26.3 ± 3.8 kg/m(2) for those who donated to O recipients vs. 24.4 ± 3.2 kg/m(2) for those who donated to N recipients; p=0.0001). Although obese recipients were more likely to face some challenges for finding a suitable living donor, there were no differences in graft and recipient survivals between the three groups in an adjusted Cox proportional hazards model (HR = 0.955, 95 % CI: 0.474-1.924, p = 0.897 for graft survival and HR = 0.901, 95 % CI: 0.555-1.463, p = 0.673 for patient survival). There were no significant differences in post-transplant complication rates between the three recipient groups or the morbidity rates for donors who donated to obese recipients compared to those who donated to overweight and normal recipients (p = 0.26). Therefore, we recommend that obese patients should undergo pre-transplant evaluations. If adequately evaluated and selected, they should be considered for LDLT. Liver Transpl , 2013. © 2013 AASLD.
    Liver Transplantation 03/2014; 20(3). DOI:10.1002/lt.23794 · 3.79 Impact Factor
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    Y Gunay · N Guler · M Akyildiz · O Yaprak · M Dayangac · Y Yuzer · Y Tokat
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    ABSTRACT: Objective: Tumor recurrence is the most important predictive factor for the survival of patients following liver transplantation for hepatocellular carcinoma (HCC). The management of recurrent HCC remains controversial. In this study, we presented the clinical outcomes of patients with recurrent HCC following living donor liver transplantation. Material and Methods: Of the 109 patients who underwent liver transplantation due to hepatocellular carcinoma, sixteen (14.7%) developed tumor recurrence and were included in the study. We analyzed the management of patients with recurrent tumors and their outcomes. Results: The mean age of patients included in the study was 55.2 ± 7.82 (28-65) years, and 13 patients (81%) were male. The mean follow up and time to recurrence were 25.8 ± 19.2 (5-78) months and 11 ± 9.4 (4-26) months, respectively. Four patients developed recurrence in the liver graft and 12 (75%) developed recurrence in extrahepatic organs. Of these patients, seven had surgical treatment, seven received chemotherapy, and two did not receive any treatment. All four surviving patients received surgical treatment. Conclusion: Recurrence of HCC following liver transplantation generally occurs in the first two years and in extrahepatic organs. The most effective treatment for patients with single and isolated recurrent tumors is surgery. However, the long term survival differed according to the type of recurrence, depending on which organs recurrence occurred in and whether recurrence was in single or multiple locations. Therefore, the treatment strategy should be individualized for longer survival. Keywords: The management of HCC, Recurrent HCC, Living donor liver transplantation.
    gulf journal of oncology, The 01/2014; 1(15):12-18.
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    ABSTRACT: In right lobe (RL) living donor liver transplantation (LDLT), portal vein (PV) variations are of immense clinical significance. In this study, we describe in detail our PV reconstruction techniques in RL grafts with variant PV anatomy and evaluate the impact of accompanying biliary variations on the recipient outcomes. In a total of 386 RL LDLTs performed between July 2004 and July 2012, the clinical data on 52 (13%) transplants using RL grafts with variant PV anatomy were retrospectively analyzed. Portal vein anatomy was classified as type 2 in 20 patients, type 3 in 24 patients, and type 4 in eight patients. The PV reconstruction techniques utilized included back-wall plasty (n = 21), back-wall plasty with saphenous vein graft interposition (n = 6), saphenous vein graft interposition (n = 5), cryopreserved iliac vein Y-graft interposition (n = 6), and quiltplasty (n = 3). There was no donor mortality. In a median follow-up of 29 months, none of the recipients had vascular complications. Anomalous PV anatomy was associated with a high (54%) incidence of biliary variations; however, these variations did not result in increased biliary complication rate. Overall, the 1- and 3-year patient survival rates of recipients were 91% and 81%, respectively. Vascular and biliary variations in RL grafts render LDLT technically more challenging. By employing appropriate reconstruction techniques, it is possible to successfully use RL grafts with PV variations without endangering recipient and donor safety.
    Transplant International 11/2013; 26(12):1191-1197. DOI:10.1111/tri.12190 · 3.16 Impact Factor
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    N Guler · Y Gunay · M Dayangac · O Yaprak · M Akyildiz · Y Yuzer · Y Tokat
    Minerva chirurgica 06/2013; 68(3):333-4. · 0.71 Impact Factor
  • 01/2013; 19(3):1. DOI:10.5455/GMJ-30-2013-161
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    ABSTRACT: Incision-related morbidity for donors is a major concern in living-donor right hepatectomy (LDRH). Open approaches use midline, J-shaped, and Mercedes incisions for LDRH. We retrospectively studied 95 consecutive donors who underwent LDRH between January 2009 and November 2010. They underwent midline (n = 32), J-shaped (n = 28), or Mercedes (n = 35) incisions. We studied resection times, perioperative bleeding, postoperative hospital stay, and postoperative pain assessed by the visual analog scale (VAS) and by analgesic requirements as well as laboratory data and complications. Postoperative analgesic requirements and postoperative VAS scores were significantly lower in the midline group (P < .05) upon univariate but not multivariate analyses. The postoperative complications as well as other parameters were similar between the groups. In conclusion, compared with a J-type shaped or not for Mercedes incision, a donor hepatectomy can be satisfactorily performed via a midline incision by experienced surgeons without increased risk.
    Transplantation Proceedings 01/2013; 45(1):218-21. DOI:10.1016/j.transproceed.2012.06.081 · 0.95 Impact Factor
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    ABSTRACT: Key Words: Hepatorenal syndrome; Liver transplantation. SummaryHepatorenal syndrome is defined as renal failure caused by acute or chronic liver failure without any laboratory or histological reasons. The exact etiology of this syndrome is unknown. However, vasodilatation in the splanchnic area as a result of cirrhosis and portal hypertension, reflex systemic and splanchnic vasoconstriction are the basic pathophysiological reasons of this syndrome. The decrease of renal perfusion, decrease in glomerular filtration rate, sodium retention and deterioration of excretion of free water are the major renal problems and these remain progressive according to the stage of liver disease. The treatment of this syndrome is correction of the underlying problem. Here, we report a patient who was having hemodialysis due to renal failure as a consequence of liver cirrhosis for three months and returned back to his normal life without a need for dialysis after liver transplantation.
    Hepato-gastroenterology 10/2012; 59(119):2305-6. DOI:10.5754/hge10791 · 0.91 Impact Factor
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    ABSTRACT: Hepatocellular carcinoma (HCC) is the fifth most common fatal cancer and an important healthcare problem worldwide. There are many studies describing the prognostic and predictive effects of epidermal growth factor receptor 2 (c-erb-B2) and epidermal growth factor receptor 1 (EGFR), transmembrane tyrosine kinases that influence cell growth and proliferation in many tumors. The current study aimed to investigate the expression levels of c-erb-B2, EGFR, PTEN, mTOR, PI3K, p27, and ERCC1 in hepatocellular carcinoma (HCC) and their correlation with other clinicopathologic features. Fifty HCC cases were stained immunohistochemically with these markers. Correlations between the markers and clinicopathologic characteristics and survival rates were analyzed. No membranous c-erb-B2 staining was seen, whereas cytoplasmic positivity was present in 92% of HCC samples, membranous EGFR was observed in 40%, PI3K was found in all samples, and mTOR was seen in 30%, whereas reduced or absent PTEN expression was observed in 56% of samples and loss of p27 was seen in 92% of the cases. c-erb-B2 and mTOR overexpression, as well as reduced expression of p27, all correlated with multiple tumors (P = 0.041, P < 0.001, and P < 0.001, respectively). P27 loss, and mTOR and EGFR positivity were significantly correlated with AFP (P = 0.047, P = 0.004, and P = 0.008, respectively). Angiolymphatic invasion was more commonly seen in EGFR- and ERCC1-positive cases (P = 0.003 and P = 0.005). EGFR was also correlated with histological grade (P = 0.039). No significant correlations were found among PTEN , PI3K, and the clinicopathological parameters. Disease-free or overall survival rates showed significant differences among therapy modalities, AFP levels, angiolymphatic or lymph node invasions, and ERCC1 and p27 expression levels (P < 0.05). c-erb-B2, EGFR, mTOR, ERCC1 overexpression levels, and loss of p27 may play roles in hepatocarcinogenesis and may be significant predictors of aggressive tumor behavior. These markers were found to be correlated with certain clinicopathologic features, therapy modalities, and survival rates in the current study. These findings may help in planning new, targeted treatment strategies .
    Hepatitis Monthly 10/2012; 12(10 HCC):e7492. DOI:10.5812/hepatmon.7492 · 1.80 Impact Factor
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    ABSTRACT: Living donor liver right lobe transplantation using donors with variation of the right sectorial portal vein is considered a challenging procedure in terms of the donor's safety and the complexity of reconstruction in the recipient. We describe an innovative technique to reconstruct double portal vein orifices via a deceased donor iliac vein graft. The postoperative course of the recipient was uneventful. Doppler ultrasound on the fourth postoperative month revealed equivalent flow in both portal vein branches. Reconstruction of double right portal vein branches using a cryopreserved iliac vein is a valuable technique for utilizing right lobe grafts with challenging portal vein anatomy.
    Hepatobiliary & pancreatic diseases international: HBPD INT 08/2012; 11(4):438-41. DOI:10.1016/S1499-3872(12)60205-7 · 1.17 Impact Factor
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    ABSTRACT: BACKROUND: Right lobe donations are known to expose the donors to more surgical risks than left lobe donations. In the present study, the effects of remnant volume on donor outcomes after right lobe living donor hepatectomies were investigated. The data on 262 consecutive living liver donors who had undergone a right hepatectomy from January 2004 to June 2011 were retrospectively analysed. The influence of the remnant on the outcomes was investigated according to the two different definitions. These were: (i) the ratio of the remnant liver volume to total liver volume (RLV/TLV) and (ii) the remnant liver volume to donor body weight ratio (RLV/BWR). For RLV/TLV, the effects of having a percentage of 30% or below and for RLV/BWR, the effects of values lower than 0.6 on the results were investigated. Complication and major complication rates were 44.7% and 13.2% for donors with RLV/TLV of ≤30%, and 35.9% and 9.4% for donors with RLV/BWR of < 0.6, respectively. In donors with RLV/TLV of ≤30%, RLV/BWR being below or above 0.6 did not influence the results in terms of liver function tests, complications and hospital stay. The main impact on the outcome was posed by RLV/TLV of ≤30%. Remnant volume in a right lobe living donor hepatectomy has adverse effects on donor outcomes when RLV/TLV is ≤30% independent from the rate of RLV/BWR with a cut-off point of 0.6.
    HPB 07/2012; 14(7):476-82. DOI:10.1111/j.1477-2574.2012.00483.x · 2.05 Impact Factor
  • E Akun · O Yaprak · R Killi · N C Balci · Y Tokat · Y Yuzer
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    ABSTRACT: To evaluate the spectrum of liver transplantation-related vascular complications that occurred in a single center over the past 14 years. Vascular complications and their clinical outcomes were reviewed among 744 liver transplant recipients. All patients underwent Doppler ultrasound with findings correlated with conventional or computed tomography angiography (CTA) in 111 patients. Among 70 recipients with vascular complications (%0.9), 14/26 patients with hepatic artery thrombosis underwent thrombectomy and arterial reanastomosis; six were retransplanted and six died. Among hepatic artery stenoses, three of nine were treated with balloon angioplasty and six underwent reanastomosis. Among 20 portal vein thromboses, 16 underwent thrombectomy, two patients retransplantation and two died. Seven patients with portal vein stenosis were followed. Two of six hepatic vein stenosis were restored with balloon angioplasty and three patients with metallic stent placement; the one other died. One patient with hepatic vein thrombosis died while the other patient was retransplanted. Transplantation related hepatic vascular complications diagnosed and managed in timely fashion showed a low mortality rate in our series.
    Transplantation Proceedings 06/2012; 44(5):1368-72. DOI:10.1016/j.transproceed.2012.02.027 · 0.95 Impact Factor
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    ABSTRACT: In liver transplantation or resection for hepatocellular carcinoma (HCC), patient selection depends on morphological features. In patients with HCC, we performed a clinicopathological analysis of risk factors that affected survival after liver transplantation. In 389 liver transplantations performed from 2004 to 2010, 102 were for HCC patients. Data were collected retrospectively from the Organ Transplantation Center Database. Variables were as follows: age, gender, preoperative alpha-fetoprotein (AFP) levels, Child-Pugh and MELD scores, prognostic staging criteria (Milan and UCSF), etiology, number of tumors, the largest tumor size, total tumor size, multifocality, intrahepatic portal vein tumor thrombosis, bilobarity, and histological differentiation. One hundred and two patients were evaluated. The 5-year overall survival rate was 56.5%. According to the UCSF criteria, 63% of the patients were within and 37% were beyond UCSF (P=0.03). Ten patients were excluded (one with fibrolamellary HCC and 9 because of early postoperative death without HCC recurrence), and 92 patients were assessed. The mean age of the patients was 56.5+/-6.9 years. Sixty-two patients underwent living donor liver transplantations. The mean follow-up time was 29.4+/-22.6 months. Fifteen patients (16.3%) died in the follow-up period due to HCC recurrence. Univariate analysis showed that AFP level, intrahepatic portal vein tumor thrombosis, histologic differentiation and UCSF criteria were significant factors related to survival and tumor recurrence.The 5-year estimated overall survival rate was 62.2% in all patients. According to the UCSF criteria, and the 5-year overall survival rate was 66.7% within and 52.7% beyond the criteria (P=0.04). Multivariate analysis showed that AFP level and poor differentiation were independent factors. For proper patient selection in liver transplantation for HCC, prognostic criteria related to tumor biology (especially AFP level and histological differentiation) should be considered. Poor differentiation and higher AFP levels are indicators of poor prognosis after liver transplantation.
    Hepatobiliary & pancreatic diseases international: HBPD INT 06/2012; 11(3):256-61. DOI:10.1016/S1499-3872(12)60157-X · 1.17 Impact Factor
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    ABSTRACT: Donor safety is one of the most important aspects of living-donor liver transplant. The preoperative evaluation of candidates for such transplants essentially starts with serologic and biochemical analyses. However, some potential liver donors with normal liver function test results may have isolated mild hyperbilirubinemia (serum indirect bilirubin level > 20.5 μmol/L [1.2 mg/dL]). Gilbert syndrome is an autosomal recessive condition that is a common cause of nonhemolytic unconjugated hyperbilirubinemia, and its prevalence is 3% to 10% in the healthy US population. Mild hyperbilirubinemia episodes are expected in people with Gilbert syndrome when they are exposed to physical stress, such as operative intervention or low energy intake. The liver morphologic findings of these individuals are normal; however, there is a debate on the use of people with Gilbert syndrome as living-liver donors. The purpose of this study was to assess the results of right-lobe living-donor hepatectomy of liver donors with Gilbert syndrome. Between 2004 and 2010, two hundred twenty-five living-donor liver transplants using right-lobe grafts were performed in our hospital. Donors with Gilbert syndrome were defined as those whose serum bilirubin level was greater than 20.5 μmol/L (1.2 mg/dL). Six of 225 right-lobe living-donor liver transplants were performed using donors with Gilbert syndrome. The median follow-up after transplant was 34 months (range, 18 to 51 mo). One week after the operation, the median bilirubin level for right-lobe liver donors was 34.5 μmol/L (2.02 mg/dL) (range, 17.1 to 51.3 μmol/L [1 to 3 mg/dL]), and the median prothrombin time (international normalized ratio) was 1.36 (range, 1.1 to 1.7). The median bilirubin level of the donors after 6 months was 29 μmol/L (1.7 mg/dL) (range, 20.5 to 41 μmol/L [1.2 to 2.4 mg/dL]). Living-donor liver transplant from Gilbert syndrome donors can be safely performed.
    02/2012; 10(1):39-42. DOI:10.6002/ect.2011.0063
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    ABSTRACT: Budd-Chiari syndrome is a rare but life-threatening disorder characterized by obstruction of the hepatic venous outflow. Treatment depends on the underlying cause, the location, and extent of the obstruction, and the functional capacity of the liver. A stepwise therapeutic approach is commonly accepted. When all other therapy options are unsuccessful, or in case of end-stage liver disease, transplant should be considered. We present case reports of 3 patients with Budd-Chiari syndrome who underwent living-donor liver transplant. Characteristic features of Budd-Chiari syndrome, diagnostic and therapeutic interventions, complications, and overall outcomes are discussed. We believe that when a deceased donor graft is unavailable, a living-donor liver transplant can be a safe option for patients with end-stage liver disease associated with Budd-Chiari syndrome.
    01/2012; 10(2):172-5. DOI:10.6002/ect.2011.0044
  • Onur Yaprak · Kadir Koray Bas · Yildiray Yuzer · Yaman Tokat
    Turkish Journal of Surgery 01/2012; 28(2):109. DOI:10.5097/1300-0705.UCD.952-11.01

Publication Stats

348 Citations
134.08 Total Impact Points


  • 2007–2014
    • Group Florence Nightingale Hastaneleri
      İstanbul, Istanbul, Turkey
  • 2007–2011
    • Istanbul Bilim University
      İstanbul, Istanbul, Turkey
  • 1998–2009
    • Ege University
      • • Department of General Surgery
      • • Department of Gastroenterology
      • • Department of Anesthesiology and Reanimation
      • • Department of Hand Surgery
      İzmir, Izmir, Turkey
  • 2003
    • Ankara University
      Engüri, Ankara, Turkey