Araştırma Çıktıları

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Author: search.filters.author.Afsar, Cigdem Usul

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    Evaluation of the relationship between serum ghrelin levels and cancer cachexia in patients with locally advanced nonsmall-cell lung cancer treated with chemoradiotherapy
    (WOLTERS KLUWER MEDKNOW PUBLICATIONS, 2020-01-01) Uysal, Pelin; Afsar, Cigdem Usul; Sozer, Volkan; Inanc, Berrin; Agaoglu, Fulya; Gural, Zeynep; Fazlioglu, Nevin Gural; Cuhadaroglu, Caglar; Uzun, Hafize
    Background: Ghrelin plays a role in mechanisms related to cancer progression - including cell proliferation, invasion and migration, and resistance to apoptosis in the cell lines from several cancers. We investigated the role of ghrelin levels in cancer cachexia-anorexia in patients with locally advanced nonsmall-cell lung cancer (NSCLC) treated with chemoradiotherapy (CRT). Materials and Methods: This study involved 84 NSCLC patients who had received concomitant CRT. Blood ghrelin levels were compared before and 3 months after CRT. Meanwhile, changes in body weight of the patients were also investigated with changes in ghrelin levels before and after CRT. Results: Ghrelin levels were significantly decreased in line with changes in patients' weights in patients receiving CRT (P < 0.001). Serum albumin levels and inflammatory-nutritional index were significantly decreased after radiotherapy (RT) (3.01 0.40 g/dL, 0.38 +/- 0.20) when compared with its baseline levels (3.40 +/- 0.55 g/dL,P < 0.001
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    Comparison of serum NEDD-9, CA 15-3, and CEA levels and PET metabolic parameters in breast cancer patients with 18 F-FDG PET/CT
    (ASSOC MEDICA BRASILEIRA, 2020-01-01) Arslan, Esra; Aral, Hale; Aksoy, Tamer; Afsar, Cigdem Usul; Karabulut, Senem; Trabulus, Fadime Didem Can; Gursu, Riza Umar; Cermik, Tevfik Fikret
    OBJECTIVE: Analyze the over expression of neural precursor cell expressed developmentally down-regulated protein 9 (NEDD-9) deregulated associated with a poor prognosis in various carcinomas. Our objective was to investigate the relationship between the levels of NEDD-9, CA 15-3, and CEA and PET (SUVmax, MTV40, TLG40) with the clinical parameters of patients with breast cancer (BC). METHODS: One hundred and eleven patients (82 BC patients who underwent 18F-FDG PET/CT and 29 healthy controls) were evaluated. SUVmax, MTV, and TLG of the primary tumor were compared with the molecular and histopathological subtypes. 18F-FDG, MTV, and TLG were evaluated based on the clinical data, i.e., nodal involvement, distant metastasis, ER and PR status, Ki-67, serum levels of NEDD-9, CA15-3, and CEA. We compared the NEDD-9 in the BC and healthy control groups. RESULTS: The mean +/- SD of SUVmax in the 82 patients was 13.0 +/- 8.6. A statistically significant relationship (p = 0.022) was found between the molecular subtypes and 18F-FDG uptake. The relationship between 18F-FDG uptake and TLG measured in patients <50 years, ER-PR negativity, and HER2 positivity were statistically significant (p=0.015, 0.007, 0.046, and 0.001, respectively). MTV40, TLG40, and CA 15-3 in metastatic patients were statistically significant (p=0.004, 0.005, and 0.003, respectively). NEDD-9 in the BC group was significantly higher than in the healthy group (p=0.017). There was a positive correlation between SUVmax and 1(167 and CA 15-3
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    Circulating annexin A2 as a biomarker in patients with pancreatic cancer
    (WOLTERS KLUWER MEDKNOW PUBLICATIONS, 2020-01-01) Karabulut, Mehmet; Afsar, Cigdem Usul; Serilmez, Murat; Karabulut, Senem
    Background: Pancreatic cancer (PC) is a highly lethal malignancy. There are only few predictive or prognostic markers for PC. This study was conducted to investigate the serum levels of annexin A2 (AnxA2) in patients with PC and its relationship with tumor progression and known prognostic parameters. Materials and Methods: Serum samples were obtained on the first admission before any treatment. Serum AnxA2 levels were determined using enzyme-linked immunosorbent assay. Age- and sex-matched healthy controls were included in the analysis. All statistical tests were carried out using two-sided test, and P <= 0.05 was considered statistically significant. Results: The median age at diagnosis was 59 years. The most common metastatic site was liver in 23 patients with metastasis (n = 19, 83\%). At the end of the observation period, thirty-two patients (97\%) were dead. Thirty-nine percent of 23 metastatic patients who received palliative chemotherapy (CTx) were CTx responsive. Median overall survival of the whole group was 41.3 +/- 8.3 weeks (95\% confidence interval = 25-58 weeks). The baseline serum AnxA2 levels were significantly higher in patients with PC than in the control group (P = 0.01). Serum AnxA2 levels were significantly higher in the patients with high erythrocyte sedimentation rate (P = 0.04). Conversely, serum AnxA2 concentration had no prognostic role on survival (P = 0.18). Conclusions: AnxA2 is identified as a novel secretory biomarker for PC, but it has no role as a prognostic or predictive marker.
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    Clinical Significance of Serum NEDD9 Levels in Patients with Pancreatic Cancer
    (MDPI, 2018-01-01) Afsar, Cigdem Usul; Karabulut, Mehmet; Karabulut, Senem; Ozal, Safiye Tokgoz; Cikot, Murat; Serilmez, Murat; Tas, Faruk
    Introduction: Pancreatic cancer (PC) is a lethal malignancy. Various diagnostic, predictive, and prognostic biomarkers have been evaluated. This study was conducted to investigate the serum levels of neural precursor cell expressed developmentally downregulated protein 9 (NEDD9) in patients with PC and the relationship between tumor progression and known prognostic parameters. Materials and Methods: Serum samples were obtained on first admission before any treatment. Serum NEDD9 levels were determined using enzyme-linked immunosorbent assay (ELISA). Age- and sex-matched healthy controls were included in the analysis. Results: In a three year period, 32 patients with a pathologically-confirmed diagnosis of PC were enrolled in this study. The median age at diagnosis was 61 years, range 38 to 84 years
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    Tubular gastric adenocarcinoma: machine learning-based CT texture analysis for predicting lymphovascular and perineural invasion
    (TURKISH SOC RADIOLOGY, 2020-01-01) Yardimci, Aytul Hande; Kocak, Burak; Bektas, Ceyda Turan; Sel, Ipek; Yarikkaya, Enver; Dursun, Nevra; Bektas, Hasan; Afsar, Cigdem Usul; Gursu, Riza Umar; Kilickesmez, Ozgur
    PURPOSE Lymphovascular invasion (LVI) and perineural invasion (PNI) are associated with poor prognosis gastric cancers. In this work, we aimed to investigate the potential role of computed tomogray (CT) texture analysis in predicting LVI and PNI in patients with tubular gastric adenocarcinoa (GAC) using a machine learning (ML) approach. METHODS Sixty-eight patients who under went total gastrectomy with curative (R0) resection and D2-lymphadenectomy were included in this retrospective study. Texture features were extracted from the portal venous phase CT images. Dimension reduction was first done with a reproducibility analysis by two radiologists Then, a feature selection algorithm was used to further reduce the high-dimensionality of the radiomic data. Training and test splits were created with 100 random samplings. ML-based classifications were done using adaptive boosting, k-nearest neighbors, Naive Bayes, neural network, random forest, stochastic gradient descent, support vector machine, and decision tree. Predictive performance of the ML algorithms was mainly evaluated using the mean area under the curve (AUC) metric. RESULTS Among 271 texture features, 150 features had excellent reproducibility, which wer e included in the further feature selection process. Dimension reduction steps yielded five texture features for LVI arid five for PNI. Considering all eight ML algorithms, mean AUC arid accuracy ranges for predicting LVI were 0.777-0.894 and 76\%-81.5\%, respectively. For predicting PNI, mean AUC and accuracy ranges were 0A82-0.754 and 54\%-68.2\% respectively. The best performances for predicting LVI and PNI were achieved with the random forest and Naive Bayes algorithms, respectively. CONCLUSION ML-based CT texture analysis has a potential for predicting LVI and PNI of the tubular GACs. Over-all, the method was more successful in predicting LVI than PNI.
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    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.
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    HIF-1 alpha Levels in patients receiving chemoradiotherapy for locally advanced non-small cell lung carcinoma
    (ASSOC MEDICA BRASILEIRA, 2019-01-01) Afsar, Cigdem Usul; Uysal, Pelin
    AIM: To examine the relationship between treatment response and hypoxia-inducible factor-1 alpha (HIF-1 alpha) levels in patients with locally advanced non-small cell lung cancer (NSCLC) who received chemoradiotherapy (CRT). METHODS: Eighty patients with NSCLC were included in the study and treated at Acibadem Mehmet Ali Aydinlar University Medical Faculty. HIF-1 alpha levels were measured before and after CRT by the enzyme-linked immunosorbent assay (ELISA) method. RESULTS: Patients' stages were as follows