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Featured researches published by ankol Y.


Asian Pacific Journal of Cancer Prevention | 2014

Distinct postsurgical management in young and elderly breast cancer patients results in equal survival rates.

Ebru Sen Oran; Yankol Y; Gürsel Remzi Soybir; Tamer Karsidag; Onur Sakalli; Ümit Geçgel; Onur Can Soybir; Atilla Soran

BACKGROUND Although breast cancer (BC) is one of the most common malignant diseases in women, the majority of the studies describing the characteristics of BC in elderly patients have been limited to survival assessments or tumor features, without using younger BC patients as a reference group. The aim of our study was to describe and compare tumor characteristics and management patterns in elderly versus younger breast cancer patients in Turkey. MATERIALS AND METHODS We retrospectively analyzed 152 patients with invasive breast cancer who underwent surgery in our institution between 2002 and 2012. Patients were divided into 2 groups according to age at the time of diagnosis. RESULTS There were 62 patients in the elderly group (≥65 years) and 90 patients in the younger group (<65 years). Compared to the younger group, tumors in the elderly group were more likely to be larger (p=0.018), of lower grade (p=0.005), and hormone receptor-positive (p>0.001). There were no significant differences regarding histology, localization, lymph node involvement, or types of surgical procedures between the 2 groups. Comorbidities were more common in elderly patients (p<0.001). In addition, elderly patients were more likely to receive hormonal therapy (p<0.001) and less likely to receive radiotherapy (p=0.08) and chemotherapy (p=0.003). There was no difference in survival and locoregional recurrence rates between the groups. CONCLUSIONS The results of this study demonstrate that breast cancer in elderly patients has more favorable tumor features, warranting less aggressive treatment regimens after surgery.


Experimental and clinical transplantation : official journal of the Middle East Society for Organ Transplantation | 2016

Lessons Learned From Review of a Single Center Experience With 500 Consecutive Liver Transplants in a Region With Insufficient Deceased-Donor Support.

Yankol Y; Nesimi Mecit; Turan Kanmaz; Cimsit B; Cakaloglu Y; Koray Acarli; Munci Kalayoglu

OBJECTIVES We present here the outcomes of our first 500 liver transplants and discuss the lessons learned during this time. MATERIALS AND METHODS We retrospectively analyzed the first 500 consecutive transplants within the listing criteria of the United Network for Organ Sharing, with recipients and donors with minimum 1-year follow-up. Patient survival and donor complications were analyzed for 31 liver transplant recipients with hepatocellular carcinoma beyond the Milan criteria who had transplant performed during the same time. RESULTS Between August 2006 and March 2013, there were 519 liver transplants performed in 500 patients (365 adult, 135 pediatric). There were 394 living-donor and 125 deceased-donor liver transplants. In addition, 31 adult liver transplants were performed in patients with hepatocellular carcinoma beyond Milan criteria (22 living-donor and 9 deceased-donor transplants). The main cause of chronic liver failure was biliary atresia in pediatric patients (30.4%) and chronic hepatitis B infection in adults (35.6%). The complication rate for primary nonfunction was 3.8%, overall biliary complications 24.0% (significantly higher after adult living-donor liver transplant, 30.3%), hepatic artery thrombosis 1.6%, portal vein thrombosis 3.0%, retransplant 3.8%, acute cellular rejection 29.6%, and bacterial infection 39.4%. Overall 1-, 3-, and 5-year patient survival rates in the first 500 consecutive transplants performed on recipients within United Network for Organ Sharing listing criteria were 87.8%, 85.0%, and 78.6%; for hepatocellular carcinoma patients beyond the Milan criteria, survival rates were 71.9%, 52.5%, and 38.2%. CONCLUSIONS In regions without a sufficient number of deceased donors, living-donor liver transplant, with its associated problems, is the only alternative to deceased-donor liver transplant. Liver transplant requires teamwork, with all players working well together for a successful outcome. The important keys to success in liver transplant include decision-making, timing, surgical skills, experience, and close follow-up.


Experimental and clinical transplantation : official journal of the Middle East Society for Organ Transplantation | 2016

Argininosuccinic Aciduria-A Rare Indication for Liver Transplant: Report of Two Cases.

Yankol Y; Nesimi Mecit; Turan Kanmaz; Koray Acarli; Munci Kalayoglu

Argininosuccinic aciduria is a urea cycle disorder caused by an argininosuccinate lyase enzyme deficiency that ends with nitrogen accumulation as ammonia. Argininosuccinic aciduria patients are at risk for long-term complications including poor neurocognitive outcome, hepatic disease, and systemic hypertension despite strict pharmacologic and dietary therapy. As the liver is the principle site of activity of the urea cycle, it is logical that a liver transplant should be an option, with careful patient selection, even in the absence of cirrhosis. We present 2 pediatric argininosuccinic aciduria patients who underwent a living-donor liver transplant from their mothers. After the liver transplant, the general well-being of the patients and their quality of life improved significantly. Liver transplant should be an option for argininosuccinic aciduria patients to prevent further neurologic deterioration and improve the patients quality of life.


Experimental and Clinical Transplantation | 2017

Liver Transplant in Children with Hepatoblastoma

Mehmet Hanifi Okur; Yankol Y; Bayındır Cimşit; Nesimi Mecit; Gökhan Ertuğrul; Turan Kanmaz; Ceyhun Bozkurt; Koray Acarli; Munci Kalayoglu

OBJECTIVES In this paper, the results of liver transplant due to hepatoblastoma in 10 pediatric patients at Istanbul Şişli Memorial Hospital Transplantation Center are presented. MATERIALS AND METHODS We retrospectively evaluated medical records of pediatric patients diagnosed with hepatoblastoma and who underwent liver transplant at our clinic between January 2009 and March 2014. We examined age, weight, chemotherapy regimen, graft type for liver transplant, duration of hospital stay, complications, follow-up duration, and survival information. RESULTS The median age of the 10 patients included in our study was 13.5 months (range, 8-120 mo), and the median weight was 10 kg (range, 6.5-30 kg). Two of the patients were twins. Five patients had pretreatment extent of disease III (centrally placed cases), and five had pretreatment extent of disease IV hepatoblastoma. Preoperative chemotherapy was given to 7 patients as cisplatin plus doxorubicin and to 3 patients per the International Childhood Liver Tumors Strategy Group 3 High-Risk Protocol at external centers. These protocols were administered according to treatment center preference. Nine patients received transplants from living donors. Two grafts were right lobes, and 7 were left lateral segments. In the remaining patient, a whole liver was received from a deceased donor. The histopathologic subgroups were epithelial in 5 patients, with others being of mixed type. Postoperative complications occurred in 3 patients as infection, intra-abdominal fluid collection, and acute rejection. The median follow-up was 32 months. One patient died because of lung metastasis within 9 months after transplant. CONCLUSIONS Centers should offer liver transplant to patients with centrally located tumors. For centers that have an insufficient number of deceased donors, living-donor liver transplant with optimal planning and early treatment can be performed.


Pediatric Transplantation | 2016

Results of pediatric living donor compared to deceased donor liver transplantation in the PELD/MELD era: Experience from two centers on two different continents

Yankol Y; Luis A. Fernandez; Turan Kanmaz; Glen Leverson; Joshua D. Mezrich; David P. Foley; Nesimi Mecit; Anthony M. D'Alessandro; Koray Acarli; Munci Kalayoglu

The LDLT option in the pediatric population allows recipients to be transplanted early. A total of 202 consecutive pediatric liver transplants from two different institutions—108 (LDLT) and 94 (DDLT)—were retrospectively compared. Overall, one‐ and three‐yr patient and graft survival were similar between DDLT and LDLT. ACR was greater in recipients of DDLT at one and three yr (50.8% and 61.0%) compared to LDLT (30.8% and 32.2%) (p = 0.002). When the data were stratified according to PELD/MELD score, LDLT with a low score had better one‐ and three‐yr graft survival (96.2% and 96.2%) compared to DDLT (88.2% and 85.2%) (p = 0.02), with comparable patient survival (p = 0.75). Patient and graft survival were similar between DDLT and LDLT in the high PELD/MELD group. Lower incidence of ACR in both low and high PELD/MELD groups was (29.6% and 34.3%) for LDLT compared to DDLT (50.3% and 53.3%, p = 0.002 and p = 0.028, respectively). Regardless of PELD/MELD score, status, age group, and recipient weight, LDLT provides excellent patient and graft survival with a lower incidence of rejection compared to DDLT.


Experimental and clinical transplantation : official journal of the Middle East Society for Organ Transplantation | 2016

Orthotopic Liver Transplant for Budd-Chiari Syndrome: An Analysis of 14 Cases.

Doğrul Ab; Yankol Y; Nesimi Mecit; Turan Kanmaz; Koray Acarli; Munci Kalayoglu

OBJECTIVES Budd-Chiari syndrome is a low-prevalence, life-threatening disorder characterized by hepatic venous outflow obstruction at the hepatic venules, the large hepatic veins, the inferior vena cava, or the right atrium. Orthotopic liver transplant should be considered for patients with fulminant and chronic forms of the syndrome. MATERIALS AND METHODS Fourteen patients received 15 orthotropic liver transplants at our center from September 2006 to March 2013. This study retrospectively reviewed the prospectively collected data from these 14 patients. RESULTS The mean age of the patients was 33 years; only 1 patient was female. The severity of liver disease was Child-Pugh score A in 1 patient, B in 4 patients, and C in 9 patients. Mean calculated Model for End-Stage Liver Disease score was 18 (range, 6-30). The cause of Budd-Chiari syndrome was factor 5 Leiden mutation in 3 patients, polycythemia vera in 2 patients, factor 2 and 3 deficiency in 1 patient, fulminant essential thrombocytosis in 1 patient, and protein C deficiency in 2 patients. We performed 15 transplants in 14 patients. Five grafts were obtained from deceased donors, and 10 grafts were from living-related donors. Mean graft-to-recipient weight ratio was 1,12 for patients receiving a living-donor liver transplant. Median follow-up was 29 months. Patient survival rates were 87%, 71%, and 71% at 1, 3, and 5 years. CONCLUSIONS Liver transplant is an option for treating Budd-Chiari syndrome in cases of fulminant presentation and cirrhosis. Living-donor liver transplant is a viable choice in countries where procuring organ donations is still a problem. To manage the long-term medical therapy and follow-up for these patients, a careful evaluation is necessary to determine the cause of Budd-Chiari syndrome. Anticoagulant and antiaggregant therapy remains the mainstay of treatment for this syndrome.


Turkish Journal of Surgery | 2015

Leiomyosarcoma of the retrohepatic vena cava: Report of a case treated with resection and reconstruction with polytetrafluoroethylene vascular graft

Yankol Y; Nesimi Mecit; Turan Kanmaz; Koray Acarli

Leiomyosarcoma of the vena cava is a rare malignant tumor. A 61-year-old woman was admitted with right upper quadrant abdominal pain. Computed tomography revealed a retrohepatic vena cava tumor originating 2 cm below the confluence of the hepaic veins and ending 2 cm above the renal veins. The tumor was resected with 1 cm clear surgical margins, without requiring liver resection. Polytetrafluoroethylene vascular graft was used for reconstruction of the vena cava. Now 32 months postoperatively, there has been no recurrence or metastasis. Radical resection with negative surgical margins is the best curative therapy for leiomyosarcoma. Polytetrafluoroethylene vascular graft can be used in extensive tumors located at the vena cava.


Experimental and clinical transplantation : official journal of the Middle East Society for Organ Transplantation | 2014

Preservation of the patent umbilical vein during a recipient hepatectomy: case report.

Doğrul Ab; Yankol Y; Nesimi Mecit; Cimsit B; Turan Kanmaz; Koray Acarli; Munci Kalayoglu

Clamping of the portal vein during a recipient hepatectomy during the anhepatic phase causes venous stagnation and hemodynamic instability. To prevent this, a temporary portocaval shunt is placed at some centers. This case report shows the patent umbilical vein of a patient undergoing a recipient hepatectomy, leading to a 20% reduction of pressure in the portal vein. Preservation of a patent umbilical vein may help prevent complications of high portal vein pressure during a recipient hepatectomy.


Experimental and clinical transplantation : official journal of the Middle East Society for Organ Transplantation | 2016

Diaphragmatic Hernia After Liver Transplant in Children: Report of 2 Cases.

Okur Mh; Yankol Y; Nesimi Mecit; Hoş G; Ertugrul G; Turan Kanmaz; Koray Acarli; Munci Kalayoglu

OBJECTIVES Diaphragmatic hernia is a rare complication after pediatric liver transplant. This report presents occurrences of diaphragmatic hernia after living-donor liver transplants in 2 children. MATERIALS AND METHODS In 1 of the 2 patients, a right-sided diaphragmatic hernia developed after a living-donor liver transplant due to progressive familial intrahepatic cholestasis where a left lateral segment graft was used. In the other patient, a left-sided diaphragmatic hernia developed after a living-donor liver transplant due to biliary atresia following Kasai portoenterostomy where a left lateral segment graft was used. RESULTS After diaphragm repair, the postoperative course was uneventful and there were no recurrences. CONCLUSIONS A literature review identified nearly 30 cases of diaphragmatic hernia following liver transplants; diaphragmatic hernia should be considered a potential surgical complication after liver transplant.


Experimental and clinical transplantation : official journal of the Middle East Society for Organ Transplantation | 2016

Management of Pediatric Acute Liver Failure in a Region With Insufficient Deceased Donor Support: A Single-Center Experience.

Yankol Y; Ertugrul M; Turan Kanmaz; Nesimi Mecit; Ocak I; Durmaz O; Koray Acarli; Munci Kalayoglu

OBJECTIVES Acute liver failure is a rapidly progressive and life-threatening disease in children, whose clinical features differ from those of adults. MATERIALS AND METHODS This is a review of a single centers experience with pediatric acute liver failure in a region with insufficient deceased donor support. The study is a retrospective review and analysis of 22 pediatric patients with acute liver failure between January 2007 and May 2013. RESULTS The cause of acute liver failure was indeterminate in 45.4% of cases. Listing for liver transplant was required in 72.7% of patients, whereas 27.3% developed spontaneous remission. In the patients placed on the liver transplant wait list, 75% underwent liver transplant and 25% died before undergoing liver transplant. The presence of ascites, high-grade encephalopathy, and laboratory findings including high lactate dehydrogenase and phosphorous levels and international normalized ratio were significant parameters in selecting patients needing liver transplants. All liver transplants were from living donors. One- and 3-year patient survival rates after liver transplant were 75% and 75%. No serious donor complications occurred. CONCLUSIONS Living-donor liver transplant may be the only option to save the lives of pediatric patients with acute liver failure, especially in regions with insufficient deceased-donor support. Timely referral to a multidisciplinary transplant center, expedient evaluation of living donors, and appropriate timing of transplant are crucial for a successful outcome.

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Turan Kanmaz

University of Wisconsin-Madison

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Munci Kalayoglu

University of Wisconsin-Madison

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Anthony M. D'Alessandro

University of Wisconsin-Madison

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Atilla Soran

University of Pittsburgh

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David P. Foley

University of Wisconsin-Madison

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Ebru Şen Oran

Memorial Hospital of South Bend

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Glen Leverson

University of Wisconsin-Madison

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Joshua D. Mezrich

University of Wisconsin-Madison

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