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Kefeli U.,Istanbul Medeniyet University | Benekli M.,Gazi University | Sevinc A.,University of Gaziantep | Yildiz R.,Dr Lutfi Kirdar Kartal Education And Research Hospital | And 14 more authors.
Oncology Letters | Year: 2013

Sorafenib is a multi-targeted tyrosine kinase receptor inhibitor used to treat patients with advanced gastrointestinal stromal tumors (GISTs). The present study evaluated the efficacy and tolerability of sorafenib therapy for patients with GISTs. Between January 2001 and November 2012, 25 patients, from multiple centers, who had received sorafenib as the third- or fourth-line treatment for GISTs were investigated retrospectively. In total, 17 patients were male and eight were female. The median age was 54.0 years (range, 16-82 years). From the patients, 21 received imatinib for longer than six months and four received it for less than six months. The clinical benefit rate of sorafenib was 40.0%. Treatment-related adverse events were reported in 72% of patients. These adverse events were generally mild to moderate in intensity. The median progression-free survival (PFS) and overall survival (OS) times of the patients who received sorafenib were 7.2 and 15.2 months, respectively. The duration of imatinib usage was an independent prognostic factor for PFS and OS. Sorafenib is an effective treatment in patients with GISTs showing a clinical benefit rate of 40.0% and an acceptable tolerability.


Speight R.,St Jamess Institute Of Oncology | Karakaya E.,Dr Ay Ankara Oncology Education And Research Hospital | Prestwich R.,St Jamess Institute Of Oncology | Sen M.,St Jamess Institute Of Oncology | And 4 more authors.
Journal of Physics: Conference Series | Year: 2014

IMRT for head and neck patients requires clinicians to delineate clinical target volumes (CTV) on a planning-CT (>2hrs/patient). When patients require a replan-CT, CTVs must be re-delineated. This work assesses the performance of atlas-based autosegmentation (ABAS), which uses deformable image registration between planning and replan-CTs to auto-segment CTVs on the replan-CT, based on the planning contours. Fifteen patients with planning-CT and replan-CTs were selected. One clinician delineated CTVs on the planning-CTs and up to three clinicians delineated CTVs on the replan-CTs. Replan-CT volumes were auto-segmented using ABAS using the manual CTVs from the planning-CT as an atlas. ABAS CTVs were edited manually to make them clinically acceptable. Clinicians were timed to estimate savings using ABAS. CTVs were compared using dice similarity coefficient (DSC) and mean distance to agreement (MDA). Mean inter-observer variability (DSC>0.79 and MDA<2.1mm) was found to be greater than intra-observer variability (DSC>0.91 and MDA<1.5mm). Comparing ABAS to manual CTVs gave DSC=0.86 and MDA=2.07mm. Once edited, ABAS volumes agreed more closely with the manual CTVs (DSC=0.87 and MDA=1.87mm). The mean clinician time required to produce CTVs reduced from 169min to 57min when using ABAS. ABAS segments volumes with accuracy close to inter-observer variability however the volumes require some editing before clinical use. Using ABAS reduces contouring time by a factor of three. © Published under licence by IOP Publishing Ltd.


Cengiz M.,Dr Ay Ankara Oncology Education And Research Hospital | Senturk S.,Goztepe Training and Research Hospital | Cetin B.,Gazi University | Bayrak A.H.,Dicle University | Bilek S.U.,Dicle University
International Journal of Clinical and Experimental Medicine | Year: 2014

Non-alcoholic fatty liver disease (NAFLD) is a common liver disease worldwide and ultrasonography is widely used in the diagnosis and the follow-up we purposed to assess intraobserver and interobserver variability in the sonographic evaluation of the existence and steatosis grades of NAFLD. Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels and AST to ALT (AST/ALT) ratio were compared between the grades of hepatosteatosis. Hepatic ultrasonography (US) examinations consisted of 5-10 static images of 113 successive adult patients, whose records were in the picture archiving and communication system (PACS) of our hospital were retrospectively evaluated by two experienced radiologists. Hepatic images were graded into 4 groups; as normal, mild, moderate or severe hepatic steatosis. Evaluation of hepatic steatosis of the same set of images was repeated after one month under the same conditions. Interobserver and intraobserver agreement was assessed by using kappa (κ) statistics. In each group, the percentage of individuals with high ALT and/or AST, or AST/ALT ratio over 1 was calculated. The intraobserver agreement was 51%, fair kappa (κ=0.356) for observer 1; and 68%, moderate (κ=0.591) for observer 2. The interobserver agreements in the initial and second readings were 39% and 40%, fair (κ=0.208) and (κ=0.225), respectively. Elevations of ALT and/or AST levels were similar between groups depending on the degree of hepatosteatosis among the patients. Visual assessment of NAFLD by ultrasonography has substantial interobserver variability, and reproducibility of results is limited. More objective imaging modalities are needed to evaluate the degree of hepatosteatosis. © 2014, E-Century Publishing Corporation. All rights reserved.


Olgun B.,Dr Ay Ankara Oncology Education And Research Hospital | Oguz G.O.,Dr Ay Ankara Oncology Education And Research Hospital | Kaya M.,Dr Ay Ankara Oncology Education And Research Hospital | Salvi S.,Dr Ay Ankara Oncology Education And Research Hospital | And 3 more authors.
Magnesium Research | Year: 2012

Purpose: we evaluated the effects of magnesium sulphate infusion on anesthetic requirement, early recovery and postoperative analgesia in desflurane-remifentanil-based, balanced anaesthesia. Methods: 60, ASA (American Society of Anesthesiologists) group 1-2 patients who were scheduled for laparoscopic cholecystectomy were randomly divided into two groups. Before anesthesia, the magnesium-treated group (n = 30) received a 15 min infusion of 40 mg/kg of magnesium sulphate followed by 10 mg/kg/h by continuous i.v. infusion during the operation. The same volume of isotonic saline was administered to the control group (n = 30). Anesthesia was induced with propofol, remifentanil and vecuronium, and maintained with desflurane 3-6%, O2/air and remifentanil infusion. Desflurane was titrated to maintain BIS (bispectral index) values of 40-60. The times from cessation of anesthesia to spontaneous breathing, eye opening, extubation, reaching BIS 70, and Aldrete scores were recorded. After surgery, patients received a patient-controlled, morphine analgesia device. Results: demographic variables were similar. During the 15 min infusion of magnesium sulphate, the BIS value was significantly lower in the magnesium sulphate-treated group. The amounts of propofol and desflurane used were less in the magnesium sulphate-treated group, by 18% and 22% respectively (p<0.05). The groups did not differ with respect to the time taken to reach BIS 70, spontaneous breathing, eye opening and extubation. Alderete and VAS (visual analogue scale) pain scores, and total morphine consumption were significantly lower in the magnesium sulphate-treated group. There were no differences in side effects, but the rate of re-intubation was higher in the group receiving magnesium sulphate (p = 0.03). Conclusion: perioperative use of magnesium sulphate reduced propofol and desflurane consumption, and the postoperative morphine requirement, while causing a delay in recovery by decreasing the Aldrete score.

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