Publications by authors named "Nazan Demir"

Pulmonary large-cell neuroendocrine carcinoma (LCNEC) is a rare and aggressive subtype of nonsmall cell lung cancer, typically occurring in elderly male smokers. Its occurrence in the adolescent population is exceptionally uncommon, with only a handful of cases reported in the literature. Even more rarely, LCNEC harbors ALK fusions, an unusual molecular alteration with important therapeutic relevance.

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Pseudomyogenic hemangioendothelioma (PHE) is an extremely rare tumor that is frequently misdiagnosed as other vascular or soft tissue neoplasms and typically follows an indolent course. Due to its locally aggressive and multifocal nature, surgical intervention is often not feasible. Moreover, conventional chemotherapy has shown limited efficacy according to existing literature.

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Introduction: Breast cancer as a life-threatening disease is the most frequent malignant disease among women all over the world. Resulting in post-traumatic stress disorder (PTSD) symptoms, breast cancer may also be related to positive changes like post-traumatic growth (PTG). The present study aims to evaluate heart rate variability (HRV) parameters among female survivors of breast cancer regarding its relationship with PTSD and PTG.

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Introduction: Pancreatic cancer is the leading cause of cancer-related deaths worldwide and most of the patients diagnosed at an advanced stage. Clinicians need simple, effective, and repeatable tools to predict the prognosis. This study aimed to evaluate the relationship between the HALP score and prognosis in patients with advanced pancreatic cancer.

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Article Synopsis
  • The study aimed to evaluate how the combination of HALP score and TTCR score influences overall survival (OS) and progression-free survival (PFS) in prostate cancer patients who developed castration resistance.
  • A total of 152 metastatic prostate cancer patients were analyzed, categorized based on median cut-off values for HALP (30.83 months) and TTCR (16.1 months), resulting in three risk stratification groups.
  • The findings indicated that lower HALP scores and shorter TTCR were linked to significantly worse PFS, and that combining these factors improved predictions for OS and PFS in patients with metastatic castration-resistant prostate cancer (mCRPC).
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The aim of our study was to evaluate the incidence of KRAS/NRAS and BRAF mutations, analyze molecular patterns, and investigate associations with clinical parameters of these mutations in CRC KRAS/NRAS and BRAF mutations analyzed by next-generation sequencing. The detection rates of these mutations and patients' demographics were recorded and the relationship between them was evaluated using the chi-square test. KRAS mutation was detected in 332 of 694 patients, while the mutation rates in KRAS exons 2/3 and 4 were 39.

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Background: Perioperative FLOT regimen is a standard of care in locally advanced operable gastric and GEJ adenocarcinoma. We aimed to determine the efficacy, prognostic factors of perioperative FLOT chemotherapy in real-life gastric and GEJ tumors.

Methods: The data of patients who were treated with perioperative FLOT chemotherapy were retrospectively analyzed from 34 different oncology centers in Turkey.

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Neoadjuvant chemotherapy (NACT) in gastroesophageal junction (GEJ) and gastric cancer (GC) was shown to improve survival in recent studies. We aimed to share our real-life experience of patients who received NACT to compare the efficacy and toxicity profile of different chemotherapy regimens in our country. This retrospective multicentre study included locally advanced GC and GEJ cancer patients who received NACT between 2007 and 2021.

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The aim of this multicentre retrospective study was to compare the efficacy of adjuvant chemotherapy regimens both with and without oxaliplatin and tumor sidedness in stage IIB (pT4aN0) colon cancer patients. This study included patients with stage IIB colon cancer who underwent curative surgery and received adjuvant chemotherapy. The patients were divided into two groups (one with and one without oxaliplatin) to compare the overall survival (OS) in right- and left-sided tumors.

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Two distinct genetic mutational pathways characterized by either chromosomal instability or high-frequency microsatellite instability (MSI-H) are recognized in the pathogenesis of colorectal cancer (CRC). Recently, it has been shown that patients with primary CRC that displays MSI-H have a significant, stage-independent, multivariate survival advantage. Biological properties of CMS1 (MSI-H type) can affect therapeutic efficiencies of agents used in the treatment of CRC, and therefore become a new predictive factor of the treatment.

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Clinical Relevance: Optical coherence tomography angiography (OCT-A) may enable the identification of alteration in the retinochoroidal microvasculature in patients with iron deficiency anaemia.

Background: To investigate the presence of macular microvascular alterations in females with IDA by using OCT-A.

Methods: This is a cross-sectional comparative study.

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Objectives: The present study aims to compare different types of insulin concerning treatment success and insulin dose requirement in type 2 diabetes patients who were receiving basal-bolus insulin therapy and to evaluate the causes of treatment failure despite high doses of insulin.

Methods: In our retrospective study, 198 type 2 diabetes patients who were receiving basal-bolus insulin therapy included. Patients were divided into three groups according to the insulin types (Group 1: short and long-acting analogue insulin users (n=83), Group 2: short and long-acting human regular insulin users (n=58), Group 3: human regular insulin + long-acting analogue insulin users (57)).

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Objectives: Non-alcoholic fatty liver disease (NAFLD) is closely associated with diseases, such as obesity, diabetes mellitus, metabolic syndrome, which are characterized by insulin resistance. NAFLD is thought to be a manifestation of metabolic syndrome in the liver. Liver fibrosis has a high prognostic significance in non-alcoholic steatohepatitis (NASH).

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Objectives: Warfarin is the most frequently used therapy as an oral anticoagulant medication for reducing the risk of thromboembolic complications. However, poor adherence to therapy may cause ineffective INR levels with increased complication risk. In our study, we aimed to show the rates of INR awareness of patients with atrial fibrillation (AF) using warfarin and whether they achieved the targeted INR values.

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Objectives: Diabetes mellitus (DM) is a chronic metabolic disease requiring lifelong medical care, and its prevalence is increasing worldwide. Early diagnosis of prediabetes and diabetes is significant in view of the mortality, morbidity and cost associated with them. Because of the difficulties in application and reproducibility of oral glucose tolerance test (OGTT), which is considered to be the gold standard in the diagnosis of DM, more feasible diagnostic tests are needed.

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Objectives: This study investigated the correlation between homocysteine levels in patients with Acute Coronary Syndrome and GRACE Score.

Methods: This study included 191 cases -140 Non-ST MI cases and 51 MI with ST-elevation cases in Şişli Etfal Training and Research Hospital Coronary Intensive Care Unit between December 2008 and March 2010. Homocysteine was measured by immulite 2000 device, using kemiluminesans method and competitive immunoassay principle and a kit by DPC was used during the measurement.

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Pectinases are an important class of enzymes distributed in many higher plants and microorganisms. One of these enzymes is pectin lyase which has an important role in industrial applications such as clarification of fruit juices. Pectin lyase was purified with 73% yield from bacteria and was 220.

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Chemicals used in cosmetics must interact with the enzymes for their consumption after entering our bodies. The area at which the interaction realizes on the enzyme is known as the active center. This center is three dimensional and optically active.

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Introduction: Late-night salivary cortisol is a frequently used and easily implemented diagnostically valuable test for the diagnosis of overt Cushing's syndrome. The use of late-night salivary cortisol in the diagnosis of subclinical Cushing's syndrome is somewhat controversial. In this study, we aimed to determine the diagnostic value of late-night salivary cortisol in diagnosing subclinical Cushing's syndrome and compare it with 24-hour urinary free cortisol levels (UFC).

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Chemicals used in cosmetics have to interact with enzymes for beneficial or destroy purpose after they enter in our body. Active sections of enzymes that catalyze reactions have three dimensions and they are active optically. When these limitations of catalytic sections are considered, it may be considered that defining geometric specifications of chemical materials and functional groups they contain may contribute on safety evaluations of cosmetic products.

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Purpose: The aim of this study is to evaluate the correlation between epicardial adipose tissue thickness and oxidative stress parameters in patients with polycystic ovarian syndrome.

Methods: The study included 35 patients with PCOS and 35 healthy women. Transthoracic echocardiography was used to measure the epicardial adipose tissue thickness (EATT) of all patients.

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Background: Docetaxel and cisplatin in combination with fluorouracil (DCF) regimen is accepted to be one of the standard regimens in the treatment of advanced gastric cancer. However, substantial toxicity has limited its use in daily clinical practice. Therefore, modification of DCF regimens, including introduction of capecitabine has been investigated to improve the safety profiles.

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In this study, serum samples from 50 patients with the diagnosis of Behcet's disease and 20 healthy volunteers were analyzed. The study consists of three parts. In the first part, paraoxonase (PON) activities were determined in the serum samples of 50 patients with Behcet's disease and 20 healthy people.

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Four isoenzymes of carbonic anhydrase (CA) were purified from Elephas Irogontherii (steppe elephant) bone (approx 0.3-0.5 million years old) from different locations (outer peripheral, cytosolic, inner peripheral and integral) using Sepharose 4B-L-tyrosine sulphanilamide affinity chromatography and their kinetics properties were investigated and compared with known CA isoenzymes.

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In this research, protease enzyme was purified and characterized from milk of Euphorbia amygdaloides. (NH4)2SO4 fractionation and CM-cellulose ion exchange chromatography methods were used for purification of the enzyme. The optimum pH value was determined to be 5, and the optimum temperature was determined to be 60 degrees C.

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