Publications by authors named "Gueldem Utkan"

Background: This study aims to identify factors predicting recurrence and unfavorable prognosis in cN+ patients who have undergone sentinel lymph node biopsy (SLNB) following neoadjuvant chemotherapy (NAC).

Methods: The retrospective multi-centre "MF18-02" and the prospective multi-centre cohort registry trial "MF18-03" (NCT04250129) included patients with cT1-4N1-3M0 with SLNB+/- axillary lymph node dissection (ALND) post-NAC.

Results: A total of 2407 cN+ patients, who later achieved cN0 status after NAC and subsequently underwent SLNB, were studied.

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  • This study explored how children's views of older people vary with age by examining Turkish primary and secondary school students' opinions.
  • The research involved a questionnaire about demographics and children's stereotypes regarding older individuals, focusing on both physical and personal traits.
  • Findings showed that older children have a mix of positive and negative views toward older people, but they do not develop more negative opinions as they grow up, highlighting the importance of early intervention to combat ageism.
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Background: Tumor deposits (TDs) are known to have a poor prognosis independent of lymph node (LN) involvement and are considered equivalent to LN metastases in the latest staging system. In stage III colon cancer (CC), high-risk patients (pT4 or pN2) receive 6 months of adjuvant chemotherapy, while low-risk patients (pT1-3 and N1) are recommended either 3 or 6 months of CAPOX or 6 months of FOLFOX therapy. However, the optimal chemotherapy duration for low-risk patients classified as pN1c remains unknown.

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  • Regorafenib is a medication for metastatic colorectal carcinoma (mCRC) that often has low efficacy and can cause adverse effects; researchers explored the impact of statin use in patients undergoing treatment.
  • In a retrospective study of 105 mCRC patients treated with regorafenib, those on statins were found to have shorter progression-free survival (1.9 vs. 4.2 months) and overall survival (4.7 vs. 6.7 months) compared to non-users.
  • The findings suggest that statin use may be linked to worse survival outcomes in mCRC patients receiving regorafenib, but further research is necessary to validate these observations.
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  • The study investigates the safety of omitting axillary lymph node dissection (ALND) in patients with residual axillary disease after neoadjuvant chemotherapy (NAC), focusing on those treated with sentinel lymph node biopsy (SLNB) or targeted axillary dissection (TAD).
  • An analysis of two multicenter cohorts (MF18-02 and MF18-03) included 501 patients who received regional nodal irradiation and achieved a complete clinical response to NAC.
  • Results showed low recurrence rates (0.4% axillary, 0.8% locoregional) and no significant differences in disease-free or disease-specific survival between SLNB and TAD, suggesting ALND omission is safe if patients receive
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Background: Geriatric patients account for nearly half of new colorectal cancer (CRC) cases. This study compares clinicopathological features, treatments, outcomes, and frailty in elderly (≥ 70) and younger (< 70) CRC patients at our center.

Materials And Methods: Patients diagnosed with non-metastatic or de novo metastatic CRC between January 2015 and April 2024 were included.

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Nanoparticles, thanks to their superior properties such as large surface area and high reactivity, can be an alternative to traditional fertilizers for improving nutrient uptake. Furthermore, considering that chemical and physical synthesis methods require high energy consumption and cause environmental pollution, plant-mediated green synthesis of NPs has attracted great attention since it provides eco-friendly, biocompatible, and inexpensive solutions. In this present study, plant mediated green synthesis of Iron Oxide (FeO), Zinc Oxide (ZnO) and Titanium Dioxide (TiO) nanoparticles by using leaves (bay leaves) were carried out and their structural properties were characterized by UV visible spectra, Dynamic Light Scattering (DLS), Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM).

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Introduction: Adjuvant chemoradiotherapy (CRT) is the optimal management strategy in resectable gastric cancer. There is a debate about the efficacy of more aggressive CRT plus chemotherapy regimens in adjuvant setting. This study aimed to compare the efficacy of adjuvant CRT plus docetaxel-cisplatin-fluorouracil (DCF) versus CRT plus fluorouracil-folinic acid (FUFA) in stage III gastric cancer.

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Low serum sodium affects cancer prognosis, but its impact on immunotherapy is unclear. Assessing the association of pre- and post-ICI treatment sodium levels with survival. We retrospectively analyzed patients receiving ICI in January 2012-December 2023, collecting serum sodium levels at treatment initiation and 4 weeks post-ICI, with overall survival (OS) as the primary outcome.

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Introduction Microsatellite instable (deficient mismatch repair, dMMR) colon cancer is associated with hypermutability and immune infiltration-activation. COVID-19 vaccines stimulate immune-inflammation response. This study aimed to investigate the types and rates of COVID-19 vaccines in patients with newly diagnosed colon cancer and compare it according to the microsatellite status.

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Background: This study aimed to evaluate the demographic," clinicopathologic, and prognostic characteristics of malignant peritoneal mesothelioma (MPeM), as well as the treatment options for the rare and heterogeneous MPeM population.

Methods: A retrospective multi-center observational cohort study was conducted to evaluate patients with MPeM. Due to the heterogeneity of the study population, the study divided them into two main groups in terms of treatments, follow-up periods, and prognostic features.

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Purpose Of Review: This review addresses the current landscape of colorectal cancer (CRC) with a focus on liver metastases, the third most common cancer globally. It explores recent findings in treatment strategies, emphasizing the dynamic interplay between surgery, systemic chemotherapy, and local therapies for synchronous colorectal liver metastases (CRLMs).

Recent Findings: Highlighting the role of advanced imaging, the review underscores the significance of contrast-enhanced MRI in surgical planning for CRLMs.

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Herein, GO (graphene oxide) or rGO (reduced graphene oxide) which is produced by the green synthesis method using plant extract (Laurus nobilis) was incorporated into a polymeric structure consisting of carboxymethyl cellulose (CMC) and polyethylene glycol (PEG) to produce a wound dressing material with enhanced mechanical and electrical properties. The effect of GO and rGO on the wound dressing features of the produced materials was investigated and compared to each other. Conductivity tests demonstrated that rGO contributed more significantly to the electrical conductivity than GO.

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Introduction: Adrenocortical carcinoma (ACC) is a rare yet highly malignant tumor associated with significant morbidity and mortality. This study aims to delineate the clinical features, survival patterns, and treatment modalities of ACC, providing insights into the disease's prognosis.

Materials And Methods: A retrospective analysis of 157 ACC patients was performed to assess treatment methodologies, demographic patterns, pathological and clinical attributes, and laboratory results.

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Objectives: The aim of this study is to examine the effect of fibromyalgia (FM) treatment on mastalgia by performing fibromyalgia screening in patients who applied for mastalgia and whose underlying cause could not be found.

Methods: Patients who applied to Kocaeli University General Surgery Outpatient Clinic between November 2017 and November 2020 with breast pain were included (n=120). Patients without cancer, systemic disease, previous breast surgery, and breast mass larger than 3 cm (n=30) were referred to the Physical Therapy and Rehabilitation Outpatient Clinic.

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Background: This study presents the diagnosis and treatment of rare small bowel tumors through clinical cases.

Methods: Patients treated between 2000 and 2023 were included in the study. The clinical records of the patients were analyzed retrospectively.

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Introduction And Hypothesis: To evaluate the effect of AF219, a P2X3 receptor antagonist, in animal models of interstitial cystitis/bladder pain syndrome (IC/BPS) induced by cyclophosphamide (CYP) or water avoidance stress (WAS).

Methods: Thirty-two adult female Wistar albino rats were used in each IC/BPS model. Assessment of nociception and anxiety and severity of inflammation in the bladder were assessed by behavioral experiments and histopathological examinations respectively.

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This study aimed to investigate the association between microsatellite instability (MSI) status and inflammatory indicators in patients with cancer. A total of 204 patients with various cancer diagnoses, including 102 with MSI-high (MSI-H) and 102 with microsatellite stable tumors, were enrolled. Neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), lymphocyte-to-monocyte ratio (LMR), C-reactive protein (CRP)-to-albumin ratio and systemic immune-inflammation index were evaluated.

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Objectives: This study aimed to evaluate the effectiveness of a 1-min 10% povidone-iodine immersion in the decontamination of dropped osteochondral fragments.

Materials And Methods: Forty-eight sets of sterile osteochondral bone fragments, each consisting of three samples, were prepared from removed femoral heads that would otherwise be discarded during different hip replacement surgeries. Immediately afterward, each set was dropped on the floor right behind the surgeon in another operating room in which fracture fixation operations were being performed.

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Histamine and H1 receptors play a crucial role in the tumor microenvironment. Preclinical data showed that concomitant use of antihistamines and immune checkpoint inhibitors (ICIs) might increase the effect of ICIs. This study aimed to evaluate the impact of antihistamines on the oncological outcomes of ICIs.

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The treatment strategy remains controversial for bilateral end-stage osteoarthritis, particularly with regard to patient safety. The aim of this study was to compare the safety and clinical results of sequential simultaneous bilateral total knee arthroplasty (ssBTKA) and staged bilateral total knee arthroplasty (staBTKA). Patients who underwent either simultaneous (n=168) or staged (n=63) bilateral total knee arthroplasty in a single center between February 2017 and April 2021 were identified retrospectively.

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Background/aim: To investigate the metabolic response and body mass index reduction according to the remaining stomach volume between 6-12 months after the operation in patients who underwent sleeve gastrectomy surgery for obesity and to determine the relationship between the remaining stomach volume and metabolic improvement. Patients underwent sleeve gastrectomy in a single center by the same team and with the same standardized method. Residual gastric volumes were calculated from three-dimensional computed tomography images obtained 6-12 months postoperatively.

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Despite the huge and efficient functionalities of reduced graphene oxide (RGO) for bioengineering applications, the use of harsh chemicals and unfavorable techniques in their production remains a major challenge. Microbial production of reduced graphene oxide (RGO) using specific bacterial strains has gained interest as a sustainable and efficient method. The reduction of GO to RGO by selected bacterial strains was achieved through their enzymatic activities and resulted in the removal of oxygen functional groups from GO, leading to the formation of RGO with enhanced structural integrity.

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Objectives: Chronic stress may lead to depression and vascular endothelial dysfunction. We aimed to evaluate the effects of propolis on vascular functions and the possible mechanisms of its vascular effects in the rat model of chronic unpredictable mild stress (CUMS)-induced depression.

Methods: Male Wistar rats were divided into control, stress (exposure to CUMS), control+propolis and stress+propolis groups (n = 8/each group).

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Purpose: Colorectal cancer (CRC) is the second most common cancer in both women and men. Microsatellite instability-high (MSI-H) CRC is a molecular subgroup and has distinct clinical and pathologic features from microsatellite stable (MSS) CRC. Studies have suggested an association between hereditary antigens in ABO blood group system and the risk of developing various cancers but the relationship between blood groups and MSI-H CRC has not been investigated.

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