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    Antibiotic resistance rates and penicillin MIC distribution in patients with streptococcal pneumonia between 2013-2019, and use of antibiotics in clinical practice
    (Elsevier, 2022) Anar, Ceyda; Bicmen, Can; Guldaval, Filiz; Atay, Tuba; Gayaf, Mine; Balci, Gunseli; Alici, Ibrahim Onur; Doğan, Betül İkbal; Büyükşirin, Melih; Ayrancı, Aysu; Karadeniz, Gülistan; Polat, Gülru
    Purpose: The purpose of the present study is to investigate the antibiotic resistance rates and use of antibiotics in patients with streptococcal pneumonia in a reference tertiary care hospital for pulmonary diseases in Izmir, Turkey.Methods: A total of 1224 cases with streptococcal pneumonia between 2013 and 2019 were included in the study, retrospectively. Drug susceptibility testing for penicillin and other antibiotics were performed according to the recommendations of EUCAST criteria. Clinical data and general characteristics were collected and evaluated for each patient in accordance with the susceptibility testing report.Results: Totally, resistance rates for trimethophrim-sulfamethoxazole, penicillin (oxacillin), erythromycin, tetra-cycline, clindamycin and levofloxacin resistance were 63.5%, 39.8%, 37.7%, 37.6%, 28.8%, and 4.8%, respec-tively. Antibiotic resistance was not detected against vancomycin,teicoplanin and linezolid. Multidrug resistance rate was found to be 27.1%. It was observed that there was a statistically significant decrease in trimethophrim-sulfamethoxazole, penicillin (oxacillin), erythromycin, clindamycin and levofloxacin resistance rates by years (p: 0.000, 0.004, 0.000, 0.001, 0.010, respectively). The penicillin MIC distribution was higher at the range of 0.12-2 mu g/mL and there was statistical difference among the ranges of MIC values for the representative years (p:0.033). Among the antibiotics investigated, the most commonly used antibiotic was moxifloxacin.Conclusions: Trimethophrim-sulfamethoxazole resistance rate has been found higher than other antibiotics. As penicillin MIC values were at the range of 0.12-2 mu g/mL frequently, high doses of penicillin treatment might be required in some patients. It is noteworthy that significant decrease in resistance rates in penicillin, erythromycin, clindamycin and tetracycline could be due to the vaccination programme carried out since 2008 in Turkey. As the empiric use of quinolones is high it would be more appropriate to use it according to the susceptibility testing. It is important to determine the regional antimicrobial susceptibility for Streptococcus pneumoniae to select appropriate empirical antimicrobials in the clinical practice.
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    Clinical effects of T790M mutation in EGFR tyrosine kinase inhibitor resistant NSCLC patients
    (2021) Anar, Ceyda; Kömürcüoğlu, Berna; Polat, Gülru; Büyükşirin, Melih; Batum, Özgür; Erdoğan, Kadri Murat; Güldaval, Filiz
    INTRODUCTION: To compare patient characteristics between the T790M-positive and T790M-negative populations, and to analyze the post-progression survival (PPS) after initial tyrosine kinase inhibitor (TKI) failure in order to investigate the prognosis in patients undergoing rebiopsy. METHODS: We investigated the patient characteristics, including the initial EGFR-TKI response and T790M status at the time of rebiopsy or liquid biopsy, subsequent treatment after resistance to the initial EGFR-TKI (the presence of EGFR-TKI re-challenge), treatment just before biopsy and/or rebiopsy (EGFR-TKIs or chemotherapy), the timing of the rebiopsy (just after the initial EGFR-TKI failure or others). RESULTS: No difference was found between the two groups with T790M mutation positive and negative in terms of age, gender, and metastasis location. Only patients with positive T790M mutation had higher progression after TKI use compared to negative ones (p: 0.000). The progression-free median survival in patients using TKI was 19.33 months in the group with T790M mutation and 22.25 months in the negative group. Overall survival was found to be 75 months and 27.5 months in the T790M positive and negative group, respectively, and this was statistically significant. (p: 0.009). DISCUSSION AND CONCLUSION: Overall survival was significantly longer in the T790M positive group than in the T790M negative group. In addition, liquid biopsy can be performed several times for patients with progression after EGFR-TKI use and who do not want to undergo tissue biopsy
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    Do the Amount of Fluid, Histopathology, Radiology and Pleurodesis Status Affect the Survival in Malignant Pleural Effusions?
    (2021) Büyükşirin, Melih; Tatar, Dursun; Karadeniz, Gülistan; Polat, Gülru; Aksel, Nimet; Güldaval, Filiz; Üçsular, Fatma Demirci
    INTRODUCTION: The primary objective of this study was to identify the most common pleural malignancies leading to malign pleural effusion (MPE). The secondary objective was to evaluate the relationship between the amount of fluid and radiological findings, etiologies, treatment methods and survival. METHODS: We retrospectively included cases of MPE with a tissue diagnosis. RESULTS: The most common causes of MPE were lung cancer (73%), breast cancer (8.3%) and mesothelioma (7%). In patients who were offered chemical pleurodesis, pleurodesis was successful in nearly 31.1%. No relation wasfound between the amount of pleural fluid and cell type,survival, pulmonary, extrapulmonary malignancy and mesothelioma, Patients live longer if pleurodesis was successful (p = 0.005). Median survival of patients with MPE due to pulmonary, extrapulmonary and mesothelioma, ORCID: 0000-0002-8939-336X respectively were 77 ± 12.8, 150 ± 48.4 and 365 ± 0 days. The survival of the patients with mesothelioma was significantly longer than others (P: 0.000). DISCUSSION AND CONCLUSION: The main cause of MPE was lung cancer, followed by breast cancer, unknown primary and mesothelioma. Chemical pleurodesis was a viable palliative measure for MPE. Successful pleurodesis had a significant contribution to the survival.
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    Prognostic effects of neutrophil-lymphocyte rates in serum and pleural fluids in malignant pleural fluids
    (2021) Ayrancı, Aysu; Yavuz, Melike Yüksel; Anar, Ceyda; Karadeniz, Gülistan; Polat, Gülru; Büyükşirin, Melih; Güldaval, Filiz
    Objective: Various studies have reported that the neutrophil-to-lymphocyte ratio in the serum (sNLR) may serve as a cost-effective and useful prognostic factor in patients with various cancer types. We investigated the clinical impact of NLR as a prognostic factor in malign pleural effusion (MPE) and sNLR on prognosis in MPE. Method: We retrospectively reviewed all of the patients who were diagnosed MPE. The relationship between sNLR and neutrophil-to-lymphocyte ratio in the malign pleural effusion (mNLR) value, age, Eastern Cooperative Oncology Group (ECOG), histopathologic type, serum albumin and lactate dehydrogenase (LDH) with survival were investigated. Results: A total of 222 patients with a mean age of 65.7±11.5 were included in the study. Patients with a mNLR value ?0.42 and a serum NLR value ?4.75 had a shorter survival (p: 0.000). Multivariate analysis, which showed that survival was significantly related mNLR value > 0.42 and/or sNLR value > 4.75 (Odds Ratio (OR): 2.66, %95 CI, 1,65-4,3 p: 0.001), serum LDH > 210 (OR = 1.8, %95 CI, 1,33-2,46 p: 0.001) and age > 65 (OR = 1.9, %95 CI, 1,41-2,55 p = 0.001). Conclusion: sNLR and mNLR may act as a simple, useful, and cost-effective prognostic factor in patients with MPE. Furthermore, these results may serve as the cornerstone of further research into the mNLR in the future. Although further studies are required to generalize our results, this information will benefit clinicians and patients in determining the most appropriate therapy for patients with MPE.