Fakülteler / Faculties
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Item Radiation Therapy for Ct1-2 Carcinoma of the Palatine Tonsil Diagnosed Via A Simple Tonsillectomy: Dosimetry and Patterns of Care in the IMRT Era(2023) Topkan, Erkan; Somay, Efsun; Yilmaz, Busra; 0000-0001-8120-7123; 37804565; AAG-2213-2021Item Letter to the Editor Regarding "Radiologic Findings of Osteonecrosis, Osteoradionecrosis, Osteomyelitis and Jaw Metastatic Disease with Cone Beam CT"(2023) Yilmaz, Busra; Topkan, Erkan; 0000-0001-8120-7123; 37806191; AAG-2213-2021Item Pretreatment Masseter Muscle Volume Predicts Survival in Locally Advanced Nasopharyngeal Carcinoma Patients Treated with Concurrent Chemoradiotherapy(2023) Pehlivan, Umur Anil; Somay, Efsun; Yilmaz, Busra; Besen, Ali Ayberk; Mertsoylu, Huseyin; Selek, Ugur; Topkan, Erkan; 0000-0001-5871-0695; 0000-0001-8251-6913; 0000-0001-8120-7123; 37959329; AAG-2213-2021Background and purpose: Muscle loss is a significant indicator of cancer cachexia and is associated with a poor prognosis in cancer patients. Given the absence of comparable studies, the current retrospective study sought to examine the correlation between the total masseter muscle volume (TMMV) before treatment and the survival outcomes in locally advanced nasopharyngeal cancer (LA-NPC) patients who received definitive concurrent chemoradiotherapy (CCRT). Methods: A three-dimensional segmentation model was used to determine the TMMV for each patient by analyzing pre-CCRT magnetic resonance imaging. The optimal TMMV cutoff values were searched using receiver operating characteristic (ROC) curve analyses. The primary and secondary endpoints were the relationship between the pre-CCRT TMMV measures and overall survival (OS) and progression-free survival (PFS), respectively. Results: Ninety-seven patients were included in this study. ROC curve analyses revealed 38.0 cc as the optimal TMMV cutoff: <= 38.00 cc (n = 42) and >38.0 cc (n = 55). Comparisons between the two groups showed that the TMMV>38.0 cc group had significantly longer PFS [Not reached (NR) vs. 28; p < 0.01] and OS (NR vs. 71; p < 0.01) times, respectively. The results of the multivariate analysis demonstrated that the T-stage, N-stage, number of concurrent chemotherapy cycles, and TMMV were independent associates of PFS (p < 0.05 for each) and OS (p < 0.05 for each) outcomes, respectively. Conclusion: The findings of the current retrospective research suggest that pretreatment TMMV is a promising indicator for predicting survival outcomes in LA-NPC patients receiving definitive CCRT.Item Predicting Teeth Extraction after Concurrent Chemoradiotherapy in Locally Advanced Nasopharyngeal Cancer Patients Using the Novel GLUCAR Index(2023) Somay, Efsun; Topkan, Erkan; Yilmaz, Busra; Besen, Ali Ayberk; Mertsoylu, Huseyin; Selek, Ugur; 0000-0001-8120-7123; 0000-0001-8251-6913; 38066835; AAG-2213-2021To evaluate the value of the newly created GLUCAR index in predicting tooth extraction rates after concurrent chemoradiotherapy (C-CRT) in locally advanced nasopharyngeal carcinomas (LA-NPCs). Methods: A total of 187 LA-NPC patients who received C-CRT were retrospectively analyzed. The GLUCAR index was defined as 'GLUCAR = (Fasting Glucose x CRP/Albumin Ratio) by utilizing measures of glucose, C-reactive protein (CRP), and albumin obtained on the first day of C-CRT. Results: The optimal GLUCAR cutoff was 31.8 (area under the curve: 78.1%; sensitivity: 70.5%; specificity: 70.7%, Youden: 0.412), dividing the study cohort into two groups: GLUCAR < 1.8 (N = 78) and GLUCAR >= 31.8 (N = 109) groups. A comparison between the two groups found that the tooth extraction rate was significantly higher in the group with a GLUCAR >= 31.8 (84.4% vs. 47.4% for GLUCAR < 31.8; odds ratio (OR):1.82; p < 0.001). In the univariate analysis, the mean mandibular dose >= 38.5 Gy group (76.5% vs. 54.9% for <38.5 Gy; OR: 1.45; p = 0.008), mandibular V55.2 Gy group >= 40.5% (80.3 vs. 63.5 for <40.5%, p = 0.004, OR; 1.30), and being diabetic (71.8% vs. 57.9% for nondiabetics; OR: 1.23; p = 0.007) appeared as the additional factors significantly associated with higher tooth extraction rates. All four characteristics remained independent predictors of higher tooth extraction rates after C-CRT in the multivariate analysis (p < 0.05 for each). Conclusions: The GLUCAR index, first introduced here, may serve as a robust new biomarker for predicting post-C-CRT tooth extraction rates and stratifying patients according to their tooth loss risk after treatment.Item Letter to The Editor: To Extract or Not Extract Teeth Prior to Head and Neck Radiotherapy?(2023) Yilmaz, Busra; Somay, Efsun; Topkan, Erkan; https://orcid.org/0000-0003-0633-5648; https://orcid.org/0000-0001-8251-6913; https://orcid.org/0000-0001-8120-7123; 36576606; AAR-6904-2020; AAG-2213-2021Item Comment on: Required Time for Pre-Oncological Dental Management-A Rapid Review of the Literature(2022) Topkan, Erkan; Somay, Efsun; Yilmaz, Busra; Kucuk, Ahmet; 0000-0001-8120-7123; 0000-0003-0633-5648; 36183502; AAG-2213-2021; AAR-6904-2020Item Letter To Editor in Regard to Recent Published Study of Abed Et Al. Titled 'The Association Between Dental Arch Length And Oral Health-Related Quality of Life in Head And Neck Cancer Patients Post-Radiotherapy'(2023) Yilmaz, Busra; Somay, Efsun; https://orcid.org/0000-0003-0633-5648; 36222114Item Initial neutrophil-to-lymphocyte ratio predicts radiation-induced trismus in parotid gland cancer(2023) Somay, Efsun; Yilmaz, Busra; Topkan, Erkan; Kucuk, Ahmet; Pehlivan, Berrin; Selek, Ugur; 0000-0001-8120-7123; 36349491; AAG-2213-2021ObjectiveTo investigate the link between pretreatment neutrophil-to-lymphocyte ratio(NLR) and the incidence of radiation-induced trismus(RIT) in parotid gland cancers(PGC) patients after postoperative radiotherapy(PORT). MethodData of PGC patients who had oral examinations before and after PORT were reviewed retrospectively. We comprised patients who had maximum mouth opening (MMO) assessments before and after PORT and complete blood count test on the first day of PORT. MMO of <= 35 mm was considered as RIT. The receiver operating characteristic (ROC) curve analysis was used to search for an ideal NLR threshold value that might be linked to RIT rates. ResultsFifty-one patients were included, with a RIT incidence of 15.7%. The NLR cutoff that showed a link with the prevalence of RIT in the ROC curve analysis was 2.7[Area under the curve (AUC):82.0%; sensitivity:87.5%; specificity:74.4%]. The patients were divided into groups based on this value:Group 1: NLR <= 2.7 (N = 34) and;NLR >2.7 (N = 17). In comparative analysis, the incidence of RIT was found to be statistically higher in the NLR >2.7 than counterpart (35.2%vs.5.8%;r(s):0.79; p < .001). Also, a mean temporomandibular joint dose >= 51.0Gy was linked to increased RIT rates (p < .001). ConclusionThis study showed that high pre-PORT NLR levels were a robust and independent predictor of significantly elevated rates of RIT.Item In Reply to Wang et al. (doi: 10.1111/odi.14391)(2022) Somay, Efsun; Yilmaz, Busra; 36398473Item In regard to recent published study of Lombardi et al. titled 'Pentoxifylline and tocopherol for prevention of osteoradionecrosis in patients who underwent oral surgery: A clinical audit'. (Spec Care Dentist. 2022;10.1111/scd.12759. )(2023) Topkan, Erkan; Somay, Efsun; Yilmaz, Busra; 0000-0003-0633-5648; 36042005