8 results on '"Aydın Sav"'
Search Results
2. Meningiomas Display a Specific Immunoexpression Pattern in a Rostrocaudal Gradient: An Analysis of 366 Patients
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Ayça Erşen Danyeli, Ege Ülgen, Pınar Kuru Bektaşoğlu, Deniz Baycin Hizal, M. Necmettin Pamir, Koray Özduman, M. Aydın Sav, and Özge Can
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Adult ,Male ,Pathology ,medicine.medical_specialty ,Adolescent ,CD34 ,Meningioma ,Young Adult ,03 medical and health sciences ,Meninges ,0302 clinical medicine ,Cranial vault ,Progesterone receptor ,Meningeal Neoplasms ,otorhinolaryngologic diseases ,medicine ,Humans ,Aged ,Retrospective Studies ,Aged, 80 and over ,business.industry ,Middle Aged ,medicine.disease ,Immunohistochemistry ,Survival Analysis ,Skull ,medicine.anatomical_structure ,030220 oncology & carcinogenesis ,Embryology ,Female ,Surgery ,Neurology (clinical) ,business ,030217 neurology & neurosurgery ,Secretory Meningioma ,Follow-Up Studies - Abstract
Background Meningiomas are heterogeneous, with differences in anatomical, histopathological, and clinical characteristics. Such spatial variability in meningioma biology is thought to result from differences in the expression of critical developmental regulators. We hypothesized that the variability in meningioma biology would follow gradients such as in embryology and tested a cohort of 366 meningiomas for histopathological and immunohistochemical gradients. Methods The medical records from 366 patients treated for meningiomas from 2003 to 2016 were retrospectively analyzed for age, gender, anatomical localization, recurrence-free survival, overall survival, histopathological diagnosis, and immunohistochemistry findings for 6 markers: epithelial membrane antigen (EMA), progesterone receptor (PR), CD34, S100, p53, and Ki-67 labeling index. Results EMA, PR, S100, p53, and CD34 were expressed in 94%, 73%, 49%, 26%, and 23% of the tumors, respectively. p53 expression correlated positively with Ki-67 and World Health Organization (WHO) grade (rτ = 0.31 and rτ = 0.4, respectively). PR positivity correlated inversely with S100, p53, Ki-67, and WHO grade (rτ = −0.19, rτ = −0.14, rτ = −0.15, and rτ = −0.16, respectively). All secretory meningiomas were positive for EMA and PR and negative for S100, and this pattern exhibited a rostrocaudal gradient. The overall proportion of EMA+PR+S100− cases was significantly lower in the cranial vault (30.3%) than in the skull base (45.89%; P = 0.021). The proportion of WHO grade II-III tumors was greater in cranial vault than in skull base meningiomas. Conclusions Unsupervised methods detected an association between the anatomical location and tumor biology in meningiomas. Unlike the categorical associations that former studies had indicated, the present study revealed a rostrocaudal gradient in both the cranial vault and the skull base, correlating with human developmental biology.
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- 2019
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3. Primer İntradural Ekstramedüller Lomber Spinal Tüberkülom
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Mehmet Yavuz, Berker Cemil, Aydın Sav, Tuncer Göker, and Kagan Tun
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Pathology ,medicine.medical_specialty ,medicine.diagnostic_test ,business.industry ,Central nervous system ,Cauda equina ,Magnetic resonance imaging ,General Medicine ,Spinal cord ,Lesion ,medicine.anatomical_structure ,Giant cell ,medicine ,Tuberculoma ,Differential diagnosis ,medicine.symptom ,business - Abstract
Tuberculosis is an important pathological entity in developing countries with increased incidence. Non-osseous spinal cord tuberculomas can be found as extradural, intradural extramedullary, or intramedullary lesions. It has been estimated that intradural spinal tuberculomas comprise only 2–5% of central nervous system tuberculomas. A 31-year-old woman presented with a 2-month history of progressive paraparesis. Magnetic resonance imaging revealed an intradural, extramedullary lesion at L3-S2 levels with high contrast enhancement. Following operation, pathological examination of the lesion revealed granulomas with multinucleated and Langhans-type giant cells, and caseation necrosis typical of a tuberculoma. In the differential diagnosis of cauda equina lesions, primary intradural extramedullary tuberculomas should be considered as a rare entity
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- 2018
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4. IDH-mutant glioma specific association of rs55705857 located at 8q24.21 involves MYC deregulation
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Şirin Yüksel, I. Melis Durası, Sevin Turcan, Murat Gunel, Jason T. Huse, M. Necmettin Pamir, Cemaliye B Akyerli, E. Paolo Nanni, M. Cengiz Yakıcıer, Manu Gupta, Adrienne M. Flanagan, Nathalie Selevsek, M. Aydın Sav, Özge Can, Jonas Grossmann, O. Uğur Sezerman, Aysel Ozpinar, William Lee, E. Zeynep Erson-Omay, Yavuz Oktay, Hanwen Bai, Ege Ülgen, Yigit Erdemgil, Koray Özduman, Octavian Henegariu, Acibadem University Dspace, University of Zurich, and Özduman, Koray
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Rare variants ,Proteome informatics ,Gene regulation ,CNS cancer ,0301 basic medicine ,Adult ,Male ,Proteomics ,Locus (genetics) ,Single-nucleotide polymorphism ,610 Medicine & health ,10071 Functional Genomics Center Zurich ,Kaplan-Meier Estimate ,Biology ,Polymorphism, Single Nucleotide ,Article ,Proto-Oncogene Proteins c-myc ,03 medical and health sciences ,Glioma ,medicine ,Biomarkers, Tumor ,Humans ,Genetic Predisposition to Disease ,Allele ,Enhancer ,Anaplasia ,Gene ,Alleles ,Genetic Association Studies ,Aged ,Genetics ,1000 Multidisciplinary ,Multidisciplinary ,Sequence Analysis, RNA ,Middle Aged ,medicine.disease ,Isocitrate Dehydrogenase ,Neoplasm Proteins ,Gene Expression Regulation, Neoplastic ,030104 developmental biology ,Isocitrate dehydrogenase ,Mutation ,Cancer research ,570 Life sciences ,biology ,Female ,medicine.symptom ,Neoplasm Grading - Abstract
The single nucleotide polymorphism rs55705857, located in a non-coding but evolutionarily conserved region at 8q24.21, is strongly associated with IDH-mutant glioma development and was suggested to be a causal variant. However, the molecular mechanism underlying this association has remained unknown. With a case control study in 285 gliomas, 316 healthy controls, 380 systemic cancers, 31 other CNS-tumors, and 120 IDH-mutant cartilaginous tumors, we identified that the association was specific to IDH-mutant gliomas. Odds-ratios were 9.25 (5.17–16.52; 95% CI) for IDH-mutated gliomas and 12.85 (5.94–27.83; 95% CI) for IDH-mutated, 1p/19q co-deleted gliomas. Decreasing strength with increasing anaplasia implied a modulatory effect. No somatic mutations were noted at this locus in 114 blood-tumor pairs, nor was there a copy number difference between risk-allele and only-ancestral allele carriers. CCDC26 RNA-expression was rare and not different between the two groups. There were only minor subtype-specific differences in common glioma driver genes. RNA sequencing and LC-MS/MS comparisons pointed to significantly altered MYC-signaling. Baseline enhancer activity of the conserved region specifically on the MYC promoter and its further positive modulation by the SNP risk-allele was shown in vitro. Our findings implicate MYC deregulation as the underlying cause of the observed association., Scientific Reports, 6, ISSN:2045-2322
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- 2016
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5. Frequency of fetal macrosomia and the associated risk factors in pregnancies without gestational diabetes mellitus
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Akin Usta, Ceyda Sancakli Usta, Ayla Yildiz, Ruhsen Ozcaglayan, Eylem Sen Dalkiran, Aydin Savkli, and Meryem Taskiran
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fetal macrosomia ,weight gain ,gestational diabetes mellitus ,body mass index ,Medicine - Abstract
BACKGROUND: there has been an increased incidence of macrosomic newborns in the world and most of the macrosomic newborns are born from non-GDM pregnant women. The objective of this study was to determine the frequency and the associated risk factors of fetal macrosomia in non-GDM pregnant women. METHODS: a total 4246 consequtive pregnant women who had no GDM was included the study population. Data was collected from hospital database of Bal?kesir State Hospital between January 2014 and January 2015. Statistical analysis was carried out using the independent samples t-test and chi-squared test. Logistic regression analysis was used to determine the relationships between associated risk factors and the presence of fetal macrosomia. In this analysis, fetal macrosomia was taken as the dependent variable and associated risk factors were taken as independent variables. Results are shown as odds ratios (ORs) (95% CI) in the logistic regression analysis. RESULTS: 366 of the 4246 pregnant women were diagnosed with fetal macrosomia (8.6%). Compared the control women, a statistically significant correlation between fetal macrosomia and pre-pregnancy body mass index (BMI), gestational weight gain (GWG), parity, advanced maternal age, and male fetal sex was found. Maternal BMI, and GWG were the two risk factors most strongly associated with macrosomia. CONCLUSION: the prevalance of fetal macrosomia is rising among Turkish women. High pre-pregnancy BMI and GWG represent main modifiable risk factors for macrosomia and need more attention from health care providers.
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- 2017
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6. Monostotic fibrous dysplasia involving occipital bone: a case report and review of literature
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Recep Basaran, Mustafa Kaksi, Erdal Gur, Mustafa Efendioglu, Ece Balkuv, and Aydin Sav
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fibrous dysplasia ,cystic ,cranial ,monostotic ,occipital ,trauma ,Medicine - Abstract
Fibrous dysplasia (FD) is a progressive systemic bone tumour of young and it can be seen on cranial bones. FD is divided into three types according to radiological features. The second most common subtype is polyostotic subtype. With this article, we aimed to review and present clinical features, radiological examination, differential diagnosis and treatment management of a case of solitary monostotic fibrous dysplasia of occipital bone. 15 years old female patient admitted to our hospital for a bump and in the back of his head that she noticed 1 month ago. Her physical and neurological examination was normal. On cranial CT examination we detected a bony defect. Her gadolinium enhanced cranial MRI revealed bony defect along with massive gadolinium enhancement in adjacent tissue. On histopathologic examination; PANCK, CD68, CD1a were found negative and CD45, S-100, Vimentine were found positive. Ki-67 was 4,8%. In conclusion, fibrous dysplasia is a progressive bone disease of the young patients. Despite its resemblance to a benign lesion by not being symptomatic it can progress and cause severe bony defects and skin lesions. Total surgical resection is necessary and sufficient for total treatment.
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- 2014
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7. Spinal Intramedullary Metastasis of Breast Cancer
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Recep Basaran, Mehmet Tiryaki, Dilek Yavuzer, Mustafa Efendioglu, Ece Balkuv, and Aydin Sav
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Medicine - Abstract
Objective. Breast cancer accounts for approximately one-third of all cancers in females. Approximately 8.5 % of all central nervous system metastases are located in the spinal cord. These patients have rapidly progressing neurological deficits and require immediate examination. The aim of surgery is decompression of neural tissue and histological evaluation of the tumor. In this paper, we present a case of breast cancer metastasis in thoracic spinal intramedullary area which had been partially excised and then given adjuvant radiotherapy. Case. A 43-year-old female patient with breast cancer for 8 years was admitted to our hospital with complaints of weakness in both legs. Eight years ago, she received chemotherapy and radiotherapy. On her neurological examination, she had paraparesis (left lower extremity: 2/5, right lower extremity: 3/5) and urinary incontinence. Spinal MRI revealed a gadolinium enhancing intramedullary lesion. Pathologic examination of the lesion was consistent with breast carcinoma metastasis. The patient has been taken into radiotherapy. Conclusion. Spinal intramedullary metastasis of breast cancer is an extremely rare situation, but it has a high morbidity and mortality rate. Microsurgical resection is necessary for preservation or amelioration of neurological state and also for increased life expectancy and quality.
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- 2014
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8. DNA fragmentation simulation method (FSM) and fragment size matching improve aCGH performance of FFPE tissues.
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Justin M Craig, Natalie Vena, Shakti Ramkissoon, Ahmed Idbaih, Shaun D Fouse, Memet Ozek, Aydin Sav, D Ashley Hill, Linda R Margraf, Charles G Eberhart, Mark W Kieran, Andrew D Norden, Patrick Y Wen, Massimo Loda, Sandro Santagata, Keith L Ligon, and Azra H Ligon
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Medicine ,Science - Abstract
Whole-genome copy number analysis platforms, such as array comparative genomic hybridization (aCGH) and single nucleotide polymorphism (SNP) arrays, are transformative research discovery tools. In cancer, the identification of genomic aberrations with these approaches has generated important diagnostic and prognostic markers, and critical therapeutic targets. While robust for basic research studies, reliable whole-genome copy number analysis has been unsuccessful in routine clinical practice due to a number of technical limitations. Most important, aCGH results have been suboptimal because of the poor integrity of DNA derived from formalin-fixed paraffin-embedded (FFPE) tissues. Using self-hybridizations of a single DNA sample we observed that aCGH performance is significantly improved by accurate DNA size determination and the matching of test and reference DNA samples so that both possess similar fragment sizes. Based on this observation, we developed a novel DNA fragmentation simulation method (FSM) that allows customized tailoring of the fragment sizes of test and reference samples, thereby lowering array failure rates. To validate our methods, we combined FSM with Universal Linkage System (ULS) labeling to study a cohort of 200 tumor samples using Agilent 1 M feature arrays. Results from FFPE samples were equivalent to results from fresh samples and those available through the glioblastoma Cancer Genome Atlas (TCGA). This study demonstrates that rigorous control of DNA fragment size improves aCGH performance. This methodological advance will permit the routine analysis of FFPE tumor samples for clinical trials and in daily clinical practice.
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- 2012
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