Publications by authors named "Zuelkuef Karahan"

Purpose: Most bladder cancers are pure urothelial carcinomas, but a small portion, approximately 5-10%, have variant histology or are non-urothelial in nature. This research sought to examine the features of and treatment strategies for different types of urothelial carcinoma with variant histologies and non-urothelial bladder cancer.

Methods: The study cohort comprised individuals with non-urothelial and variant urothelial bladder cancers treated at two medical centres in Ankara, Turkey, between 2005 and 2024.

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Objective: This study investigated the effects of sleep deprivation (SD) on balance after normal sleep, 24 h of SD, and subsequent rest under eyes-open (EO) and eyes-closed (EC) conditions. Our aim was to ascertain whether the reduced efficiency of balance control following SD is generalized or selective.

Method: Nineteen participants (12 females, 7 males) completed the Pittsburgh Sleep Quality Index (PSQI).

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Aim: Breast cancer is the most common cancer in women and is a leading cause of cancer-related mortality. The role of neoadjuvant therapy (NAT) in conjunction with surgical intervention is becoming increasingly prominent in the field of oncology. NAT enhance the probability of breast-conserving surgery in cases of locally advanced breast cancer and in patients with metastatic or inoperable disease.

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  • Cardiac resynchronization therapy (CRT) improves functional mitral regurgitation (FMR) by coordinating heart muscle segments, especially between papillary muscles, beyond just boosting left ventricular (LV) performance.
  • Eighteen patients with dilated cardiomyopathy underwent tests to measure heart function, and biventricular pacing showed a significant reduction in mitral regurgitation despite some patients showing no change in LV pressure.
  • The study concludes that CRT effectively lowers FMR independently of LV systolic function improvements, highlighting the importance of understanding its mechanisms for better treatment outcomes.
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Total Neoadjuvant Therapy (TNT) is a promising strategy for treating locally advanced rectal cancer (LARC) and has started to replace the traditional neoadjuvant chemoradiotherapy (CRT). This review combines findings from pivotal studies that helped TNT to integrate into clinical practice. It emphasizes the efficacy of TNT in improving the disease-free and metastasis-free survival, pathologic complete response and, according to recent studies, a potential improvement in overall survival when compared to standard CRT.

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Background: Dissociative amnesia, a disorder characterized by impairments in multiple memory areas, is frequently associated with trauma. Complex post-traumatic stress disorder (CPTSD) is marked by mood dysregulation, negative self-concept, and impaired interpersonal relationships, in addition to the classic symptoms of post-traumatic stress disorder (PTSD). The relationship between CPTSD and dissociative amnesia, as well as whether CPTSD should be considered a dissociative subtype, remains uncertain in the literature.

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Natural treatment options for Microsporum canis dermatophytosis are being explored because of resistance to several antifungal medications. In this study, the potential antifungal effect of bee venom (BV), a natural antimicrobial agent, on M. canis was investigated.

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Background: Malignancies are the third leading cause of death among kidney transplant recipients. These patients face increased mortality and challenges such as allograft loss and rejection, which may arise from surgical complications, changes in immunosuppressive therapy or the use of chemotherapeutics. This study aims to examine the risk of allograft rejection and loss in kidney transplant recipients diagnosed with malignancies.

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Elimination of cytotoxic effect in cells with multidrug resistance (MDR) phenotype is a situation that is gradually acquired over time and develops through multiple pathways resulting in global phenotypic changes of cells. Although molecular background of the resistance phenotype has widely been studied in the gene expression level, segmental and gene copy number variations (CNVs) have limitedly been documented. Thus, in the present study, we aimed to analyze the CNVs using DNA microarray in the sensitive and two doxorubicin-resistant MCF-7 breast cancer cell lines which had different resistance indices.

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  • Malondialdehyde (MDA) is identified as a potential predictor of inhospital mortality in patients with acute coronary syndrome (ACS), a condition with limited research on this marker compared to stable angina pectoris.
  • The study involved 556 ACS patients, using leftover plasma samples to analyze various blood markers, including MDA, troponin, and others, in relation to inhospital mortality.
  • Results showed that MDA levels, along with age and creatine, were independent predictors of inhospital mortality, with an optimal MDA cutoff value of >33.1 providing high sensitivity (85%) and specificity (88.17%) for predicting outcomes.
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  • Endometrium cancer is the most common gynecological cancer in developed countries, and this study was conducted to assess how HER2 positivity affects patient prognosis.
  • The study analyzed 121 patients diagnosed with endometrial cancer between September 2019 and December 2023, categorizing them into HER2-low and HER2-high groups based on their HER2 immunohistochemistry scores.
  • Findings showed that those in the HER2-high group had better survival outcomes than those in the HER2-low group, and both FIGO stage and HER2 status emerged as independent risk factors influencing overall survival.
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  • SCUBE-1 is a new marker indicating ischemia and has been studied for its connection to uteroplacental blood flow in preeclampsia patients.
  • In the study, 32 preeclamptic women showed significantly higher maternal serum SCUBE-1 levels compared to a control group of 32 healthy pregnancies, alongside elevated uterine artery pulsatility indexes.
  • Although SCUBE-1 levels were higher in preeclampsia, there was no significant correlation with umbilical artery pulsatility index or cerebroplacental ratio, but a notable correlation was found with uterine artery pulsatility index.
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Objective: Management of type 1 diabetes (T1DM) is quite challenging for both adolescents and their families. In this study, we aimed to translate the 14-item Problem Areas in Diabetes-Teen (PAID-T) scale, which measures variables that influence diabetes distress, to Turkish and investigate the Turkish version's reliability and validity.

Methods: One hundred and ninety-four adolescents with T1DM participated in the study.

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IKKα is a multifunctional serine/threonine kinase that controls various biological processes, either dependent on or independent of its kinase activity. However, the importance of the kinase function of IKKα in human physiology remains unknown since no biallelic variants disrupting its kinase activity have been reported. In this study, we present a homozygous germline missense variant in the kinase domain of IKKα, which is present in three children from two Turkish families.

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Radiomics is a quantitative tool for digital image analysis. This systematic review aims to investigate the scientific articles to evaluate the potential implications of Radiomics analysis in Dentomaxillofacial Radiology (DMFR). Studies regarding Radiomics applications in DMFR and human samples, in vivo study, a case reports/series if ≧5 samples were included, while case reports/series if < 5 samples, articles other than in English, abstracts without full text, and studies published before 2015 were excluded.

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Objectives: The most effective treatment for end-stage renal failure is renal transplant. Nonadherence to medication is one of the most important factors in organ rejection and an important problem in pediatric renal transplant and an important cause of graft failure. Adherence is the most important modifiable factor that affects treatment outcomes.

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Background: Twenty-four-hour mean arterial pressure (MAP) is underutilized for the diagnosis and risk assessment of hypertension in clinical settings. The objective of this study is to assess the relation of MAP with systolic and diastolic blood pressure (BP) in diagnosing hypertension on 24-hour ambulatory blood pressure monitoring (ABPM), while also examining its diagnostic effectiveness.

Methods: This retrospective study analyzed 24-hour ABPM of 532 adults.

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The purpose of this research is to examine the relationship between the social well-being of healthcare professionals and their perception of gender roles. The correlational screening model was used in the research. The study group consisted of 247 healthcare professionals working in a university hospital.

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  • The study compared clinical outcomes of rhegmatogenous retinal detachment (RRD) surgeries during COVID-related lockdowns (partial and complete) versus non-COVID periods in a tertiary ophthalmology clinic.
  • A total of 20 cases were analyzed for both partial and complete lockdowns, and 23 cases from non-COVID times, focusing on factors such as visual symptoms duration, lens status, and visual acuity.
  • Results showed no significant differences in surgical approaches or final visual acuity after two years across the different periods, suggesting that lockdowns did not impact the effectiveness of RRD surgeries.
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  • * The study reviewed 19 patients, predominantly experiencing hypoglycemia, with tumor locations identified in 74% of cases via CT and 88% via intraoperative ultrasound, and the most common surgical procedure was enucleation (53%).
  • * The findings suggest that accurately locating insulinomas is vital for the right surgical approach, with enucleation recommended for suitable patients due to its higher success rates and lower serious morbidity, despite a higher occurrence of pancreatic fistulas.
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  • The FLOT 4-AIO trial demonstrated that a docetaxel-based treatment was more effective than an epirubicin-based regimen for patients with locally advanced resectable gastric cancer, but many patients didn't complete the full treatment plan of eight cycles.
  • This study compared total neoadjuvant therapy (FLOT x8) with the standard approach (FLOT 4+4) to see which method improved treatment completion and tumor downstaging for patients with advanced gastric tumors prior to surgical removal.
  • Results showed that the FLOT x8 group had a significantly higher completion rate of 89.1% compared to 67.6% in the FLOT 4+4
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Introduction: Serious outbreaks of Shiga toxin-producing Escherichia coli-associated hemolytic uremic syndrome (STEC-HUS) have been reported globally. In 2011, Germany experienced a significant outbreak of HUS caused by enteroaggregative E. coli (EAEC) O104:H4 strain.

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Background: Sarcopenia is a progressive age-related skeletal muscle disease associated with adverse outcomes in those with cardiovascular disease. In this study, the prevalence of sarcopenia and its effect on clinical outcomes in heart failure with mildly reduced ejection fraction (HFmrEF) patients were examined.

Methods: A total of 722 patients from three centres who applied to the outpatient clinic with the diagnosis of HFmrEF between 01 January 2020 and 01 June 2021 were included in the study retrospectively.

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  • Chronic venous insufficiency (CVI) is prevalent among nurses, affecting 65% of the sample studied, and significantly impairs their quality of life and job performance.
  • The study found that factors such as chronic diseases, pregnancy, and being over the age of 26.5 significantly increase the risk of developing CVI, particularly in women.
  • The researchers advocate for the implementation of risk screening and educational programs to prevent CVI among nurses, given its high and concerning prevalence in this healthcare profession.
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