Browsing by Author "Guven, Koray"

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Chemoradiation and consolidation chemotherapy for rectal cancer provides a high rate of organ preservation with a very good long-term oncological outcome: a single-center cohort series
(BMC, 2022-01-01) Asoglu, Oktar; Bulut, Alisina; Aliyev, Vusal; Piozzi, Guglielmo Niccolo; Guven, Koray; Bakir, Baris; Goksel, Suha
Aim To report long-term oncological outcomes and organ preservation rate with a chemoradiotherapy-consolidation chemotherapy (CRT-CNCT) treatment for locally advanced rectal cancer (LARC). Method Retrospective analysis of prospectively maintained database was performed. Oncological outcomes of mid-low LARC patients (n=60) were analyzed after a follow-up of 63 (50-83) months. Patients with clinical complete response (cCR) were treated with the watch-and-wait (WW) protocol. Patients who could not achieve cCR were treated with total mesorectal excision (TME) or local excision (LE). Results Thirty-nine (65\%) patients who achieved cCR were treated with the WW protocol. TME was performed in 15 (25\%) patients and LE was performed in 6 (10\%) patients. During the follow-up period, 10 (25.6\%) patients in the WW group had regrowth (RG) and 3 (7.7\%) had distant metastasis (DM). Five-year overall survival (OS) and disease-free survival (DFS) were 90.1\% and 71.6\%, respectively, in the WW group. Five-year OS and DFS were 94.9\% (95\% CI: 88-100\%) and 80\% (95\% CI: 55.2-100\%), respectively, in the RG group. For all patients (n=60), 5-year TME-free DFS was 57.3\% (95\% CI: 44.3-70.2\%) and organ preservation-adapted DFS was 77.5\% (95\% CI: 66.4-88.4\%). For the WW group (n=39), 5-year TME-free DFS was 77.5\% (95\% CI: 63.2-91.8\%) and organ preservation-adapted DFS was 85.0\% (95\% CI: 72.3-97.8\%). Conclusion CRT-CNCT provides cCR as high as 2/3 of LARC patients. Regrowths, developed during follow-up, can be successfully salvaged without causing oncological disadvantage if strict surveillance is performed.
Dealing with the gray zones in the management of gastric cancer: The consensus statement of the Istanbul Group
(AVES, 2019-01-01) Aytac, Erman; Aslan, Fatih; Cicek, Bahattin; Erdamar, Sibel; Gurses, Bengi; Guven, Koray; Falay, Okan; Karahasanoglu, Tayfun; Selcukbiricik, Fatih; Selek, Ugur; Atalar, Banu; Balik, Emre; Tozun, Nurdan; Rozanes, Izzet; Arican, Ali; Hamzaoglu, Ismail; Baca, Bilgi; Mandell, Nil Molinas; Saruc, Murat; Goksel, Suha; Demir, Gokhan; Agaoglu, Fulya; Yakicier, Cengiz; Ozbek, Ugur; Ozben, Volkan; Ozyar, Enis; Guner, Ahmet Levent; Er, Ozlem; Kaban, Kerim; Bolukbasi, Yasemin; Bugra, Dursun; Ahishali, Emel; Asian, Fatih; Boz-bas, Aysun; Hamzaoglu, Hulya; Karaman, Ahmet; Kucukmetin, Nurten Turkel; Vardareli, Eser Kutsal; Onder, Fatih Oguz; Sisman, Gurhan; Tiftikci, Arzu; Unal, Hakan Umit; Yapali, Suna; Acar, Sami; Agcaoglu, Orhan; Aghayeva, Afag; Akyuz, Ali; Atasoy, Deniz; Batik, Emre; Bayraktar, Ilknur Erenler; Bayram, Onur; Bilgic, Cagri; Bilgin, Ismail Ahmet; Can, Ugur; Dulgeroglu, Onur; Durukan, Ugur; Gencosmanoglu, Rasim; Gonenc, Murat; Gurbuz, Bulent; Kaya, Mesut; Omarov, Nail; Ozben, Volkan; Ozgur, Ilker; Ozoran, Emre; Sobutay, Erman; Uras, Cihan; Uymaz, Derya; Zenger, Serkan; Ozbek, Ugur; Yakicier, M. Cengiz; Afsar, Cigdem Usul; Bozkurt, Mustafa; Demir, Atakan; Er, Ozlem; Kanitez, Metin; Korkmaz, Taner; Mandel, Nil Molina; Mert, Askhan Guven; Ozer, Leyla; Sonmez, Ozlem; Tunali, Didem; Uluc, Basak Oyan; Yazar, Aziz; Yildiz, Ibrahim; Demirkurek, Cengiz; Guner, Ahmet Levent; Vardareli, Erkan; Armutlu, Aye; Baba, Fisun; Ersozlu, Ilker; Kapran, Yersu; Sahin, Davut; Abacioglu, Mehmet Ufuk; Bese, Nuran; Durankus, Nilufer Kilic; Gural, Zeynep; Ozyar, Enis; Sengoz, Meric; Sezen, Duygu; Caliskan, Can; Guven, Koray; Karaaslan, Ercan; Kizilkaya, Esref; Suleyman, Erdogan; Grp, Istanbul
The geographical location and differences in tumor biology significantly change the management of gastric cancer. The prevalence of gastric cancer ranks fifth and sixth among men and women, respectively, in Turkey. The international guidelines from the Eastern and Western countries fail to manage a considerable amount of inconclusive issues in the management of gastric cancer. The uncertainties lead to significant heterogeneities in clinical practice, lack of homogeneous data collection, and subsequently, diverse outcomes. The physicians who are professionally involved in the management of gastric cancer at two institutions in Istanbul, Turkey, organized a consensus meeting to address current problems and plan feasible, logical, measurable, and collective solutions in their clinical practice for this challenging disease. The evidence-based data and current guidelines were reviewed. The gray zones in the management of gastric cancer were determined in the first session of this consensus meeting. The second session was constructed to discuss, vote, and ratify the ultimate decisions. The identification of the T stage, the esophagogastric area, imaging algorithm for proper staging and follow-up, timing and patient selection for neoadjuvant treatment, and management of advanced and metastatic disease have been accepted as the major issues in the management of gastric cancer. The recommendations are presented with the percentage of supporting votes in the results section with related data.
Endovascular Repair of Iliac Artery Aneurysms: A Single Center Experience in 10-Years
(FORUM MULTIMEDIA PUBLISHING, LLC, 2019-01-01) Goksel, Onur S.; Gok, Emre; Onalan, Akif; Guven, Koray; Capar, Gazi; Cinar, Bayer; Alpagut, Ufuk
Objectives: Isolated iliac artery aneurysms (IAAs) are rare, but nonetheless life-threatening when ruptured. The endovascular approach has taken over open repairs in time. The reported data is constituted of a retrospective series. We reviewed our 10-year-long experience with elective endovascular treatment of iliac aneurysms. Methods: Data regarding 22 patients with 24 IAAs treated with endovascular stent grafting between 2005 and 2015 were reviewed. Results: Twenty-two patients (aged 68.4 +/- 9.6 years, range 50-82) with 24 unilateral or bilateral iliac aneurysms were treated. Twenty patients (91\%) were male. Two patients with unilateral IAA had prior abdominal aortic aneurysm (AAA) surgical repair. The mean aneurysm diameter was 4.8 +/- 2.1 (3.8 to 7.1) mm. Procedural success rate was 100\%
Magnetic Resonance Image-Guided Hypofractionated Ablative Radiation Therapy for Hepatocellular Carcinoma With Tumor Thrombus Extending to the Right Atrium
(CUREUS INC, 2022-01-01) Dincer, Neris; Ugurluer, Gamze; Mustafayev, Teuta Zoto; Gungor, Gorkem; Atalar, Banu; Guven, Koray; Ozyar, Enis
Hepatocellular carcinoma (HCC) presenting with tumor thrombus and inferior vena cave (IVC)/right atrium (RA) infringement point to an advanced-stage disease that is deemed inoperable. Stereotactic body radiotherapy is an emerging treatment option for this group of patients with promising outcomes in recent studies that are comparable to conventional treatment methods, namely, transarterial chemoembolization and transarterial radioembolization. Here, we report a case of HCC with RA extension through the IVC. The patient was referred to our clinic for treatment options, and he was found suitable for magnetic resonance imaging-guided radiotherapy (MRgRT). We treated the patient with MRgRT in five fractions to a total dose of 40 Gray. The tumor was tracked during the treatment sessions, and adaptive treatment planning was performed before each fraction. The patient tolerated the treatment well with no acute grade 3-4 toxicities. The last follow-up showed that the patient had a complete biochemical response and is now a candidate for an orthotopic liver transplant. To our knowledge, this report is the first to document the MRgRT treatment of an HCC with TT and RA extension. MRgRT is safe and feasible for this patient group and can be an effective bridging therapy for liver transplants.
Multidisciplinary approach in the treatment of osteoid osteoma with radiofrequency ablation
(TURKISH JOINT DISEASES FOUNDATION, 2020-01-01) Tanriverdi, Bulent; Salik, Aysun Erbahceci; Cetingok, Halil; Edipoglu, Erdem; Bilgili, Mustafa Gokhan; Guven, Koray; Sacan, Filiz
preventing complications. Patients and methods: For this retrospective study, a team of two orthopedists, two interventional radiologists, and one anesthesiologist was established in January 2013 to manage the diagnosis, follow-up, and treatment process of patients with OO at Bak ?rk?y Dr. Sadi Konuk Training and Research Hospital. A total of 27 patients (15 males, 12 females
PERCUTANEOUS TREATMENT OF BILE LEAKAGE AFTER LIVING DONOR LIVER TRANSPLANTATION
(ISTANBUL UNIV, FAC MEDICINE, PUBL OFF, 2019-01-01) Server, Sadik; Guven, Koray
Objective: Biliary leakage (BL) is one of the most frequent complications following living donor liver transplantation (LDLT). Radiological methods are important in diagnosis and treatment. Although endoscopic approaches are considered as the first-line treatment option in BL, nowadays, increasing experience is strengthening the role of interventional radiological approaches. In our article, we aim to analyze our experience in the diagnosis and treatment of BLs developed after LDLT. Material and methods: Between January 2015 and December 2018, 361 LDLT cases performed consecutive at our center were analyzed retrospectively. The leakage diagnosis and location was demonstrated by magnetic resonance cholangiopancreatography (MRCP) with hepatobiliary excreted contrast agent gadoxetate disodium in patients with suspected leakage. BLs were treated by endoscopic, interventional radiological, surgical or conservative approaches. Results: Of the total 361 cases, 27 (7.4\%) had BL. Twenty six (96\%) of the BL were anastomotic and 1 (3,7\%) was incision surface leakage. One patient (3.7\%) was treated by endoscopic sphincterotomy methods, 23 (85,1\%) patients by interventional radiological approaches, two patients (7.4\%) by surgery and 1 patient (3,7\%) by conservative approaches. There were no minor and major complications during interventional radiological procedures. After the procedure, minor complications (mild cholangitic attack) in 4 (17.4\%), mild edematous pancreatitis in 2 (8,6\%) developed in 6 (26\%) patients. Conclusion: Endoscopic treatment approaches may be complicated in patients with multiple anastomosis of biliary tract after LDLT. Although interventional radiological approaches require experience, they can be performed as an alternative treatment method.
The impact of total neo-adjuvant treatment on nonoperative management in patients with locally advanced rectal cancer: The evaluation of 66 cases in a single center (vol 46, pg 402, 2019)
(ELSEVIER SCI LTD, 2020-01-01) Asoglu, Oktar; Tokmak, Handan; Bakir, Baris; Demir, Gokhan; Ozyar, Enis; Atalar, Banu; Goksel, Suha; Koza, Burak; Mert, Aslihan Guven; Demir, Atakan; Guven, Koray