DSpace Arşivi :: by Yazar "Yilmaz, Ercan" değerine göre listeleniyor

Yazar "Yilmaz, Ercan" seçeneğine göre listele

Listeleniyor 1 - 20 / 53

The ability of various cerebroplacental ratio thresholds to predict adverse neonatal outcomes in term fetuses exhibiting late-onset fetal growth restriction
(Walter De Gruyter Gmbh, 2021) Melekoglu, Rauf; Yilmaz, Ercan; Yasar, Seyma; Hatipoglu, Irem; Kahveci, Bekir; Sucu, Mete
Objectives: Our primary aim was to evaluate the ability of various cerebroplacental ratio (CPR) reference values suggested by the Fetal Medicine Foundation to predict adverse neonatal outcomes in term fetuses exhibiting lateonset fetal growth restriction (LOFGR). Our secondary aim was to evaluate the effectiveness of other obstetric Doppler parameters used to assess fetal well-being in terms of predicting adverse neonatal outcomes. Methods: This was a retrospective cohort study of 317 pregnant women diagnosed with LOFGR at 37-40 weeks of gestation between January 1, 2016, and September 1, 2019. Receiver operating characteristic (ROC) curves were drawn to determine the predictive performance of CPR <1, CPR <5th or <10th percentile, and umbilical artery pulsatility (PI) >95th percentile in terms of predicting adverse neonatal outcomes. Results: Pregnant women exhibiting LOFGR who gave birth in our clinic during the study period at a mean of 38 gestational weeks (minimum 37+0; maximum 40+6 weeks); the median CPR was 1.51 [interquartile range (IQR) 1.12-1.95] and median birthweight 2,350 g (IQR 2,125-2,575 g). The CPR <5th percentile best predicted adverse neonatal outcomes [area under the curve (AUC) 0.762, 95% confidence interval (CI) 0.672-0.853, p<0.0001] and CPR <1 was the worst predictor (AUC 0.630, 95% CI 0.515-0.745, p=0.021). Of other Doppler parameters, neither the umbilical artery systole/diastole ratio nor the mid-cerebral artery to peak systolic velocity ratio (MCA-PSV) predicted adverse neonatal outcomes (AUC 0.598, 95% CI 0 .480 - 0.598, p=0.104; AUC 0.521, 95% CI 0.396-0.521, p=0.744 respectively). Conclusions: The CPR values below the 5th percentile better predicted adverse neonatal outcomes in pregnancies complicated by LOFGR than the UA PI and CPR <1 by using Fetal Medicine Foundation reference ranges.
Acute Abdominal Pain With Rupture Of Uterine Leimyosarcoma
(Lippincott Williams & Wilkins, 2016) Coskun, Ebru Inci; Yilmaz, Ercan; Sahin, Nurhan
[Abstract Not Available]
Ameliorative Effects of Resveratrol on Acute Ovarian Toxicity Induced by Total Body Irradiation in Young Adult Rats
(Elsevier Science Inc, 2012) Simsek, Yavuz; Gurocak, Simay; Turkoz, Yusuf; Akpolat, Nusret; Celik, Onder; Ozer, Ali; Yilmaz, Ercan
Objective: The purpose of this study was to investigate the ovarian protective effects of resveratrol in rats exposed to total body irradiation. Design: Experimental study. Settings: University hospital. Participants and Interventions: Thirty female rats were randomized into four groups: (1) control group (n = 7); (2) low-dose (10 mg/kg) resveratrol group (n = 8); (3) high-dose (100 mg/kg) resveratrol group (n =7); and (4) sham irradiation group (n = 8). The drugs were administered intraperitoneally as single doses, and the rats were exposed to total body radiation 24 h after the treatment. The animals were sacrificed the following day, and their ovaries were excised for histopathological and biochemical analysis. Main Outcome Measures: The ovarian follicle counts were calculated, and irradiation-dependent ovarian damage and tissue levels of antioxidant enzymes were evaluated. Results: Group 2 and Group 3 showed significantly higher numbers of total follicle counts compared with Group 1 (P < 0.01). The low-dose resveratrol treatment was associated with significantly higher numbers of primary follicles than the high-dose group. The tissue activities of glutathione peroxidase (GsH-Px) and catalase (CAT) were significantly elevated in the resveratrol-treated animals. Evaluation of ovarian histology revealed no remarkable changes in fibrosis and leucocyte infiltration among the resveratrol-treated and control rats; however, vascularity was significantly reduced in the high-dose group (P = 0.014). Conclusion: Resveratrol attenuated irradiation-dependent ovarian damage, suggesting that this natural antioxidant is effective in reducing the follicle loss induced by ionizing radiation.
Amniotic fluid urocortin-1 concentrations for the prediction of preterm delivery
(Wiley, 2013) Karaer, Abdullah; Celik, Ebru; Celik, Onder; Simsek, Omer Yavuz; Ozerol, Ibrahim Halil; Yilmaz, Ercan; Turkcuoglu, Ilgin
Aim The aim of this study was to analyze whether urocortin-1 concentration in midtrimester amniotic fluid could serve as an indicative marker of preterm labor. Material and Methods A retrospective cohort study was conducted. Urocortin-1 concentrations in midtrimester amniotic fluid were measured in 22 pregnant women with preterm deliveries and 45 women who delivered at term using enzyme-linked immunosorbent assay. Results The median amniotic fluid urocortin-1 concentration was significantly lower in the women with preterm birth (40.06pg/mL; range, 13.77-67.58pg/mL) than in the women who gave birth at term (49.56pg/mL; range, 26.25-175.9pg/mL; P=0.022). The result of receiver-operator curve analysis indicates that an amniotic fluid urocortin-1 concentration57.88pg/mL had an area under the curve of 0.673 (95% confidence interval, 0.55-0.78; P=0.01) with a sensitivity of 81.8%, specificity of 40.0%, positive predictive value of 40%, and a negative predictive value of 82% in identifying which of the patients subsequently delivered prematurely. Conclusions These results suggest that low urocortin-1 concentration in midtrimester amniotic fluid could be used as an indicative marker of preterm birth.
Analysis of prognostic factors in Grade 3 endometrioid type endometrial carcinoma
(Wiley, 2022) Sahin, Eda Adeviye; Toprak, Serhat; Sayal, Hasan Berkan; Ekinci, Tekin; Yilmaz, Ercan; Bakay, Kadir; Melekoglu, Rauf
Objective To investigate the prognostic factors of patients with Grade 3 endometrioid endometrial cancer (G3EEC). Methods This four-center, retrospective study included a total of 129 women with G3EEC. Demographic, clinicopathologic, and survival data were collected. Kaplan-Meier method was used for survival analysis. Predictors of outcome were analyzed using Cox proportional hazards models. Results Median age at the time of diagnosis was 63 (range 39-87) years and median follow up was 37 (range 6-126) months. For the entire cohort, the 5-year disease-free survival (DFS) and overall survival (OS) were 54.3% and 63.6%, respectively. The 5-year DFS rates for lymphovascular space invasion (LVSI) -positive and -negative patients were 41.6% and 88.3%, respectively (P < 0.001). The 5-year OS rates for LVSI-positive and -negative patients were 54.7% and 88.3%, respectively (P = 0.001). Positive LVSI status was identified as the independent prognostic factor for decreased DFS and OS (hazard ratio [HR] 5.5, 95% confidence interval [CI] 1.65-18.86; P = 0.006 versus HR 4.4, 95% CI 1.33-14.58; P = 0.013, respectively). Conclusion LVSI seems to be an independent prognostic factor for decreased DFS and OS in G3EEC patients.
Association of low maternal levels of salusins with gestational diabetes mellitus and with small-for-gestational-age fetuses
(Elsevier, 2013) Celik, Ebru; Celik, Onder; Yilmaz, Ercan; Turkcuoglu, Ilgin; Karaer, Abdullah; Turhan, Ugur; Aydin, Suleyman
Objectives: To evaluate maternal and cord serum concentrations of salusin-alpha and salusin-beta in women with gestational diabetes mellitus (GDM) and with small-for-gestational age (SGA) fetuses. Study design: Pregnant women with GDM (n = 25), women with SGA (n = 20) and maternal age-matched normal healthy pregnant subjects (n = 25) participated in the study. Maternal serum and cord blood salusin-alpha and salusin-beta levels at the time of birth were measured using ELISA, and their relation with metabolic parameters was also assessed. Results: Mean concentrations of maternal and fetal serum salusin-alpha in the GDM and SGA groups were significantly lower than those of the controls (P < 0.001, P < 0.001, P < 0.001 and P < 0.001, respectively). Mean concentrations of maternal and cord blood salusin-beta also decreased in both the GDM and the SGA groups in comparison to the control group (P < 0.001, P < 0.001, P < 0.001 and P < 0.001, respectively). The concentrations of maternal serum salusin-alpha and salusin-beta were strongly positively correlated with the concentrations of cord blood salusin-alpha and salusin-beta (R = 0.92, P < 0.001 and R = 0.94, P < 0.001, respectively). Conclusions: The low levels of maternal serum salusin-alpha and salusin-beta may have negative impact on metabolic disorders and vascular dysfunction. (C) 2012 Elsevier Ireland Ltd. All rights reserved.
Associations between second-trimester amniotic fluid levels of ADAMTS4, ADAMTS5, IL-6, and TNF-? and spontaneous preterm delivery in singleton pregnancies
(Walter De Gruyter Gmbh, 2019) Melekoglu, Rauf; Yilmaz, Ercan; Ciftci, Osman; Kafadar, Yusuf Taner; Celik, Ebru
Background: We investigated the roles of inflammatory cytokines and the A disintegrin and metalloproteinase with thrombospondin motifs (ADAMTS) family in the etiopathogenesis of spontaneous preterm delivery by comparing the ADAMTS4, ADAMTS5, interleukin (IL)-6, and tumor necrosis factor-alpha (TNF-alpha) levels in second-trimester amniotic fluid between pregnant women with preterm birth and term controls. Methods: All pregnant women who underwent second-trimester amniocentesis for genetic analysis between January 1, 2016, and January 1, 2018, were enrolled in this study. From this cohort, 22 patients who subsequently experienced spontaneous preterm delivery before 34 weeks of pregnancy formed the study group, and 22 age- and body mass index (BMI)-matched patients without preterm birth constituted the control group. Results: No significant differences were observed between the preterm birth and control groups in terms of age, BMI, obstetric history of preterm delivery, gestational age at amniocentesis, or indication for amniocentesis. The mean amniotic fluid levels of ADAMTS4 and ADAMTS5 were significantly increased in the preterm birth group compared to the control group (248.3 +/- 22.6 and 182.4 +/- 19.8 pg/mL, P = 0.012; and 198.6 +/- 21.6 and 159.1 +/- 21.7 pg/mL, P = 0.035, respectively). Significantly increased IL-6 and TNF-a levels were also detected in the amniotic fluid of women who experienced spontaneous preterm delivery, relative to controls (142.1 +/- 16.2 and 95.8 +/- 16.4 pg/mL, P < 0.001; and 139.4 +/- 12.5 and 89.6 +/- 11.2 pg/mL, P < 0.001, respectively). Conclusion: The results of this study imply that increased mid-trimester amniotic fluid levels of ADAMTS4, ADAMTS5, IL-6, and TNF-alpha play an important role in the pathophysiology of spontaneous preterm delivery.
Atorvastatin exerts anti-nociceptive activity and decreases serum levels of high-sensitivity C-reactive protein and tumor necrosis factor-? in a rat endometriosis model
(Springer Heidelberg, 2014) Simsek, Yavuz; Gul, Mehmet; Yilmaz, Ercan; Ozerol, Ibrahim Halil; Ozerol, Elif; Parlakpinar, Hakan
Purpose The purpose of this study was to examine the effects of atorvastatin in the treatment of experimental endometriosis. Methods Endometriosis was induced in 24 female rats. 4 weeks after the procedure dimensions of the foci were recorded. Rats were divided into three groups: in Group 1 (n = 8), a daily dose of 10 mg/kg atorvastatin was given for 14 days. In the second group (n = 8), a single dose of 1 mg/kg leuprolide acetate was injected intraperitoneally. The rats in Group 3 (n = 8) were received 1 mg/kg i.p. 0.9 % NaCl. At the end of the treatment, laparotomy was performed, and the dimensions of the endometriotic foci were recorded. Biochemical, histopathological and immunohistochemical studies were performed and nociception was compared in groups. Results Atorvastatin treatment exhibited significant analgesic activity in hot plate model (P = 0.022). The serum hs-CRP and tumor necrosis TNF-alpha levels were similar between the Group 2 and Group 3 (P > 0.05); however atorvastatin caused significant decrease in both serum markers. The histological and immunohistochemical scores were also found to be markedly lower in Group 1 and Group 2 (P < 0.05). Conclusion Atorvastatin treatment may have a therapeutic potential in the treatment of endometriosis through its anti-inflammatory and anti-nociceptive properties.
c-Kit proto-oncogene expression in endometrial hyperplasia and endometrial cancer
(Springer Heidelberg, 2012) Yilmaz, Ercan; Celik, Onder; Simsek, Yavuz; Turkcuoglu, Ilgin; Celik, Ebru; Gul, Mehmet; Hascalik, Seyma
To evaluate the expression of c-kit (CD117) in endometrial hyperplasia and endometrial cancer. Expression of c-kit in 10 normal endometrium, 18 simple endometrial hyperplasia, 16 complex endometrial hyperplasia (10 cases with atypia and 6 cases without atypia), and 6 endometrial cancer were investigated by immunohistochemistry. c-Kit expression decreased as the lesion progressed to endometrial cancer. Immunostaining was mostly focal and weak in the normal endometrium and was mostly diffuse and strong in the simple and complex endometrial hyperplasia. Simple and complex hyperplastic endometrial tissues express diffuse cytoplasmic staining for c-kit and the expression decreases with the progression of the lesion.
A comparative study on oxidative and antioxidative markers of serum and follicular fluid in GnRH agonist and antagonist cycles
(Springer/Plenum Publishers, 2012) Celik, Ebru; Celik, Onder; Kumbak, Banu; Yilmaz, Ercan; Turkcuoglu, Ilgin; Simsek, Yavuz; Karaer, Abdullah
To determine whether concentrations of oxidative stress markers of follicular fluid and serum are different in GnRH agonist protocol from GnRH antagonist protocol. This was a cross-sectional study. Eighty-four women undergoing controlled ovarian stimulation with either GnRH agonist (n = 39) or GnRH antagonist protocols (n = 45) for IVF/ICSI treatment were assigned by a physician. Blood was obtained at the time of oocyte retrieval, and follicular fluid (FF) from the mature follicles of each ovary was centrifuged and frozen until analysis. Malondialdehyde (MDA), nitric oxide (NO), protein carbonyl (PC), hydroxyl proline (OH-P), sodium oxide dismutase (SOD), reduced glutathione (GSH), glutathione peroxidase (GSH-Px), adenosine deaminase (ADA) and xanthine oxidase (XO) were assessed in the serum and follicular fluid of each participants. The mean serum concentrations of GSH-Px, GSH and MDA were lower in the GnRH antagonist group compared to GnRH agonist group, but mean serum SOD was higher in the GnRH antagonist group. The mean follicular SOD, ADA and NO were higher in GnRH antagonist group than GnRH agonist group. The IVF/ICSI outcomes were similar in both groups. GnRH antagonist protocol is associated with increased oxidative stress. The relation of GnRH analogues with oxidative stress and its implication in follicular growth needs to be addressed in further studies.
Comparison of preoperative serum neopterin, periostin, indoleamine 2,3-dioxygenase, YKL-40, and tenascin-C levels with current tumor markers for early-stage endometrial cancer
(Wiley, 2021) Unuvar, Songul; Melekoglu, Rauf; Turkmen, Nese B.; Yilmaz, Ercan; Yasar, Seyma; Yuce, Hande
Objective: To compare the predictive value of serum levels of neopterin, periostin, YKL-40, tenascin-C (TNC), and indoleamine 2,3-dioxygenase (IDO) with current tumor markers for the primary diagnosis of early-stage endometrial cancer. Methods: A prospective cross-sectional study was conducted between January 2020 and November 2020. A total of 59 patients (38 women newly diagnosed with early-stage endometrial cancer [study group] and 21 women with benign endometrial pathologies [control group]) were enrolled. Blood samples were collected prior to surgery and underwent immunoassay analysis. Results: Carcinoembryonic antigen (CEA), periostin, and IDO levels were significantly higher in the study group than the control group (P = 0.008, P = 0.034, and P = 0.003, respectively). Receiver operating characteristic curve analysis revealed that IDO, periostin, and CEA were good predictors of early-stage endometrial cancer (AUC = 0.733, 95% CI, 0.602-0.840, P < 0.002; AUC = 0.668, 95% CI, 0.533-0.785, P = 0.018; and AUC = 0.709, 95% CI, 0.576-0.820, P = 0.002, respectively). Correlation analysis revealed no significant correlation of any biomarker with age or body mass index in either the control or study group. Conclusion: Serum CEA, periostin, and IDO levels were significantly higher in women with endometrial cancer than in those without cancer. These results may help identify new markers for diagnosing endometrial cancer.
COMPARISON OF TVUS, MRI, AND FROZEN SECTION METHODS IN PREOPERATIVE DETECTION OF MYOMETRIAL INVASION IN PATIENTS WITH ENDOMETRIAL CANCER
(Sestre Milosrdnice Univ Hospital, 2021) Kural, Hasim; Yilmaz, Ercan; Melekoglu, Rauf; Akatli, Aysenur; Karaca, Leyla
We aimed to evaluate the depth of myometrial invasion preoperatively with trans vaginal ultrasound, magnetic resonance imaging, and frozen section examination techniques in patients diagnosed with endometrial cancer. Our study included 65 patients. Transvaginal ultrasound and magnetic resonance imaging were performed in study patients in the preoperative period. Frozen section examination was performed in all hysterectomy samples obtained from all study patients. Data were analyzed with SPSS Statistics 22.0 program. The sensitivity of transvaginal ultrasound in determining the depth of myometrial invasion was 88.64%, specificity 90.48%, positive predictive value 95.12%, and negative predictive value 79.17%. For magnetic resonance imaging, the sensitivity was 63.64%, specificity 95.24%, positive predictive value 96.55%, and negative predictive value 55.56%. In addition to the frozen section examination, which is the gold standard in determining the myometrial invasion depth, transvaginal ultrasound and magnetic resonance imaging have become commonly used methods for this purpose in recent years. Ultrasound examination performed by an experienced specialist is superior to magnetic resonance imaging as it is fast, inexpensive, and associated with higher sensitivity.
Cord blood nesfatin-1 and apelin-36 levels in gestational diabetes mellitus
(Springer, 2012) Aslan, Mehmet; Celik, Onder; Celik, Nilufer; Turkcuoglu, Ilgin; Yilmaz, Ercan; Karaer, Abdullah; Simsek, Yavuz
To assess maternal serum and cord blood apelin-36 and nesfatin-1 concentrations in pregnant women with and without gestational diabetes mellitus (GDM). Thirty pregnant women with GDM and 30 gestational age matched healthy pregnant subjects participated to the study. Maternal serum and cord blood nesfatin-1 and apelin-36 levels were measured with ELISA, at the time of birth. The relationships between maternal serum and cord blood nesfatin-1 and apelin-36 levels, anthropometric and metabolic parameters were also assessed. Maternal serum apelin-36 levels were found higher (13.5 +/- A 8.3 vs. 9.6 +/- A 5.9 ng/ml, P = 0.001) and nesfatin-1 levels were found lower (5.5 +/- A 8.1 vs. 8.1 +/- A 23.9 ng/ml, P = 0.001) in patients with GDM compared with control pregnant women. However, the cord blood apelin-36 levels (8.8 +/- A 4.3 and 8.2 +/- A 1.9 ng/ml, P = 0.618) and nesfatin-1 levels (5.4 +/- A 4.0 and 6.2 +/- A 10.3 ng/ml, P = 0.688) were similar in the GDM and control groups, respectively. Maternal serum apelin-36 and nesfatin-1 levels correlated positively with their respective cord blood levels. Maternal serum and cord blood apelin-36 levels correlated negatively with the gestational age and birth weight. Similarly maternal serum and cord blood nesfatin-1 levels correlated negatively with the gestational age, but there was no correlation with the birth weight. We did not find a correlation between maternal serum apelin-36 and nesfatin-1 levels, maternal age, BMI, fasting glucose, fasting insulin, and HOMA-IR. Also cord blood apelin-36 and nesfatin-1 levels did not correlate with the maternal age, BMI, HOMA-IR, cord blood glucose, and cord blood insulin levels. Our results indicate that apelin-36 concentrations increase and nesfatin-1 concentrations decrease in maternal serum of women with GDM.
Determination of biomarker candidates for the placenta accreta spectrum by plasma proteomic analysis
(Nature Portfolio, 2024) Melekoglu, Rauf; Yasar, Seyma; Colak, Cemil; Kasap, Murat; Dogan, Umran Karabulut; Yologlu, Saim; Yilmaz, Ercan
Placenta accreta spectrum (PAS) presents a significant obstetric challenge, associated with considerable maternal and fetal-neonatal morbidity and mortality. Nevertheless, it is imperative to acknowledge that a noteworthy subset of PAS cases remains undetected until the time of delivery, thereby contributing to an augmented incidence of morbidity among the affected individuals. The delayed identification of PAS not only hinders timely intervention but also exacerbates the associated health risks for both the maternal and fetal outcomes. This underscores the urgency to innovate strategies for early PAS diagnosis. In this study, we aimed to explore plasma proteins as potential diagnostic biomarkers for PAS. Integrated transcriptome and proteomic analyses were conducted to establish a novel diagnostic approach. A cohort of 15 pregnant women diagnosed with PAS and delivering at Inonu University Faculty of Medicine between 01/04/2021 and 01/01/2023, along with a matched control group of 15 pregnant women without PAS complications, were enrolled. Plasma protein identification utilized enzymatic digestion and liquid chromatography-tandem mass spectrometry techniques. Proteomic analysis identified 228 plasma proteins, of which 85 showed significant differences (P < 0.001) between PAS and control cases. We refined this to a set of 20 proteins for model construction, resulting in a highly accurate classification model (96.9% accuracy). Notable associations were observed for proteins encoded by P01859 (Immunoglobulin heavy constant gamma 2), P02538 (Keratin type II cytoskeletal 6A), P29622 [Kallistatin (also known as Serpin A4)], P17900 (Ganglioside GM2 activator Calmodulin-like protein 5), and P01619 (Immunoglobulin kappa variable 3-20), with fold changes indicating their relevance in distinguishing PAS from control groups. In conclusion, our study has identified novel plasma proteins that could serve as potential biomarkers for early diagnosis of PAS in pregnant women. Further research and validation in larger PAS cohorts are necessary to determine the clinical utility and reliability of these proteomic biomarkers for diagnosing PAS.
ECTOPIC PELVIC KIDNEY MIMICKING ADNEXAL MASS
(Galenos Yayincilik, 2012) Yilmaz, Ercan; Simsek, Yavuz; Karaer, Abdullah; Celik, Ebru; Turkcuoglu, Ilgin; Dogan, Cagdas; Aydin, Engin
Ectopic kidney, common developmental disorder in women with abnormalities of the genitourinary system and in clinic, mimicking adnexal pathologies. In this case report, hydronephrosis developed a pelvic ectopic kidney mimicking adnexal cystic pathology.
Effect of ovarian stimulation with recombinant follicle-stimulating hormone, gonadotropin-releasing hormone agonist and antagonists, on follicular fluid stem cell factor and serum urocortin 1 levels on the day of oocyte retrieval
(Springer Heidelberg, 2013) Celik, Onder; Celik, Ebru; Yilmaz, Ercan; Celik, Niluefer; Turkcuoglu, Ilgin; Ulas, Mustafa; Kumbak, Banu
To compare the serum and follicular fluid (FF) concentrations of stem cell factor (SCF) as well as the serum urocortin 1 (UCN1) concentration in gonadotropin-releasing hormone antagonist (GnRH-ant) and gonadotropin-releasing hormone agonist (GnRH-a) protocols for controlled ovarian hyperstimulation (COH) in IVF patients. Follicular fluids and blood samples of 42 infertile women undergoing COH for IVF-embryo transfer with either GnRH agonist (n = 22) or GnRH antagonist (n = 20) protocols from 2010 to 2011 were collected during oocyte retrieval. SCF concentrations of serum and FF were assessed by sandwich enzyme immunoassay using ELISA Kit for SCF kid. Serum UCN1 concentration were measured using commercially available enzyme-linked immunosorbent assay. Concentrations of serum UCN1, serum and FF SCF were similar in the two groups. The serum SCF levels correlated strongly with the follicular SCF levels (r = 0.770, p < 0.001). The mean implantation rate, biochemical and clinical pregnancy rate and live birth rate per cycle were also similar in the groups. These observations suggest that there is no significant difference in follicular microenvironment in terms of SCF and UCN1 between agonist and antagonist protocols.
The Effect of Prognostic Factors and Adjuvant Radiotherapy on Survival in Patients with High-Grade Early-Stage Endometrial Cancer: A Retrospective Clinical Study
(Int Scientific Information, Inc, 2019) Yilmaz, Ercan; Gurocak, Simay; Melekoglu, Rauf; Koleli, Isil; Faydali, Simge; Temelli, Oztun; Yar, Tuba
Background: This retrospective clinical study aimed to investigate the effect of prognostic factors and adjuvant radiotherapy in patients with high-grade early-stage endometrial cancer on overall survival (OS) and disease-free survival (DES). Material/Methods: The medical records of patients diagnosed with high-grade, early stage (I or II) endometrial adenocarcinoma who had received adjuvant radiotherapy after surgery were reviewed. Results: Seventy-nine patients included 39 patients (49.4%) with stage II endometrial cancer, 25 patients (31.6%) with histologic grade 3 tumors, and 47 patients (59.5%) with endometrial cancer showing lymphovascular space invasion (LVSI). There were 45 patients (57.0%) who received external pelvic radiotherapy with an average dose of 46.0 Gy (range, 11.2-50.4 Gy), and 34 patients (43.0%) received vaginal brachytherapy (VBT) with an average dose of 21.5 Gy (range, 10-36 Gy). Multivariate analysis showed that tumor stage (HR, 4.066; 95% CI, 1.227-13.467; p=0.022) and histologic grade (HR, 16.652; 95% CI, 4.430-62.589; p<0.001) were independent predictors for OS. Increased serum CA-125 levels (HR, 1.136; 95% CI, 0.995-1.653; p=0.047) and histologic grade (HR, 3.236; 95% CI, 1.107-15.156; p=0.015) were independent predictors for DES. Adjuvant radiotherapy was not found to be significantly associated with improved OS (HR, 1.259; 95% CI, 0.518-3.058; p=0.612) or DES (HR, 1.056; 95% CI, 0.994-1.123; p=0.078). Conclusions: This retrospective study showed that in high-grade early-stage endometrial cancer treated with postoperative adjuvant radiotherapy, independent predictors for OS were tumor stage and grade. Adjuvant radiotherapy was not associated with improved OS or DES.
Effects of Substrate Temperature on the Microstructure and Morphology of CdZnTe Thin Films
(Springer, 2014) Malkas, Hasan; Kaya, Senol; Yilmaz, Ercan
The effects of substrate temperature on the microstructure and morphology of CdZnTe thin films were investigated in detail. The CdZnTe thin films were deposited on glass substrates at 200A degrees C, 300A degrees C and 400A degrees C by radio frequency magnetron sputtering and annealed at 450A degrees C for an hour under N-2 ambient at atmospheric pressure. The microstructure and morphology of the CdZnTe films were analyzed by using x-ray diffractometry, scanning electron microscopy, energy dispersive x-ray spectroscopy and atomic force microscopy. The effects of substrate temperature on transmission spectra of the CdZnTe films were also investigated. The experimental results show that the optimum morphology and crystalline thin film structures were achieved at 400A degrees C growth temperature. At higher substrate temperatures, atomic mobility and diffusion are promoted, which can stabilize the uniformity and crystallite size. The crystalline grains enlarge and the surface morphology becomes smoother due to growth of grains in the CdZnTe thin films. In addition, the transmission spectra of the films are consistent with the morphological changes. It may be concluded that substrate temperature in growing CdZnTe films has a substantial effect on morphological characteristics, and desired quality of the CdZnTe thin films may be fabricated at higher substrate temperatures.
EFFICACY OF INTERNAL ILIAC ARTERY LIGATION ON THE MANAGEMENT OF POSTPARTUM HEMORRHAGE AND ITS IMPACT ON THE OVARIAN RESERVE
(Galenos Yayincilik, 2012) Simsek, Yavuz; Yilmaz, Ercan; Celik, Ebru; Turkcuoglu, Ilgin; Karaer, Abdullah; Turhan, Ugur; Celik, Onder
Aim: Time of surgical treatment for postpartum hemorrhage, still being the most important cause of maternal mortality in the developing countries, could be lifesaving. In the present report, the results of bilateral internal iliac artery ligation in cases with postpartum hemorrhage were presented, in addition, the impact of the procedure on ovarian reserve were discussed. Design and patients: Patients who gave birth between August 2010 and August 2011 in our center, treated surgically due to a diagnosis of postpartum hemorrhage were retrospectively examined. Setting: A tertiary referral center Main outcome measures: The obstetric and demographic characteristics, applied surgical procedures, the need for intensive care unit, the amount of transfusion, length of hospital stay and associated morbidities and mortalities were evaluated. Postpartum concentrations of follicle stimulation hormone (FSH) and estradiol with ovarian volume calculated by ultrasonography to evaluate the impact of procedure on ovarian reserve were also examined anc compared normal controls. Results: The prevalence of postpartum hemorrhage requiring a surgical treatment was 12.5% during the period of study. Thirteen of those underwent the ligation of bilateral internal iliac artery. The mean age of 32 (24 -44), mean gravida 3,2 (1-5), mean parity 2 (0-4), mean birth week 38 (35-41) and mean birth weight were 3373 g (2500 -4200). The effectiveness of bilateral internal iliac artery ligation was 84,7%. FSH and estradiol concentrations and the mean volume of the ovaries were similar between the study (n: 10) and control (n: 56) groups (P=0.650, P=0.245 and P=0.281, respectively). Conclusion: The ligation of bilateral iliac artery, a fertility preserving method, possess high efficacy for the management of postpartum hemorrhage. The ovarian reserves of patients were not adversely affected by the surgical procedure, as well.
Elevated cardiac oxidative stress in newborn rats from mothers treated with atosiban
(Springer Heidelberg, 2012) Simsek, Yavuz; Celik, Onder; Karaer, Abdullah; Yilmaz, Ercan; Gul, Mehmet; Ozerol, Elif; Bilgic, Sedat
The purpose of this study was to evaluate the cardiac and cerebral oxidative stress in the offspings of pregnant rats treated with oxytocin antagonist atosiban. Experimentally naive, adult female Wistar-albino rats (200-250 g) were mated with adult male rats for copulation. After confirming pregnancy, eight gravid rats were then randomly assigned into two equal groups. The animals were treated from days 15 to 20 of gestation. One group acted as a control group, and received intraperitoneal (i.p.) injections of saline in a daily dose volume of 6 mg/kg/day. The second group received 6 mg/kg/day i.p. atosiban. On day 21 of gestation, pups were delivered by cesarean. The heart and brain tissues of the newborn rats were dissected and sent for the measurement of total oxidant status, total antioxitant status and oxidative stress index. There was no significant difference in birthweight or in the number of pups between two groups. Newborns from atosiban-treated mothers showed significantly increased oxidative stress in the plasma and heart tissue than that of controls which was confirmed by histological examination (P < 0.05). Oxidative stress parameters and histopathological results of the brain tissues of newborns were similar between two groups (P > 0.05). Oxytocin receptor blockage for the treatment of premature delivery may be associated with increased fetal morbidity and mortality secondary to the elevated oxidative stress in the heart of the newborns.

Yazar "Yilmaz, Ercan" seçeneğine göre listele

Sayfa Başına Sonuç

Sıralama seçenekleri