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    Effects of treatment regimens on survival in patients with malignant pleural mesothelioma
    (Verduci Publisher, 2013) Abakay, A.; Abakay, O.; Tanrikulu, A. C.; Sezgi, C.; Sen, H.; Kaya, H.; Kucukoner, M.
    BACKGROUND AND OBJECTIVE: In this study, we aimed to investigate the factors affecting the survival of patients with malignant pleural mesothelioma (MPM) according to their treatment regimens, including best supportive care (BSC), chemotherapy, surgical group and multimodality (MM) therapy. PATIENTS: A retrospective analysis was performed on clinical data and treatment outcomes of 400 patients registered in our hospital with MPM between January 1989 and April 2010. RESULTS: Mean age (p < 0.001), presence of asbestos exposure (p = 0.0014), presence of smoking history (p < 0.001), Karnofsky performance status (p < 0.001), histological subtype (p = 0.034) and stage (p < 0.001) variables were found to be significantly different among the four treatment regimens. Mean survival time of all patients was 12.32 months. Mean survival time 10.5 months for the BSC group, 15.7 for the surgical group, 16.02 for the chemotherapy group, and 26.55 for the MM group. There were significant differences in mean survival time among the four treatment regimens. In addition, a significant difference was found in survival time between the two chemotherapy groups (p = 0.032). Mean survival time for cisplatin + gemcitabine was found to be 14.49 months and for cisplatin + pemetrexed, 18.34 months. CONCLUSIONS: The MM group had better survival rates than the other groups. The new chemotherapy combination, cisplatin + pemetrexed, can be helpful in improving survival time.
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    Frequency of respiratory function disorders among dental laboratory technicians working under conditions of high dust concentration
    (Verduci Publisher, 2013) Abakay, A.; Atilgan, S.; Abakay, O.; Atalay, Y.; Guven, S.; Yaman, F.; Palanci, Y.
    BACKGROUND AND OBJECTIVES: Dental laboratory technicians (DLTs) have much exposure to mineralogical dust that may have adverse effects on their lung health. The aim of our study was to investigate occupational dust exposure, and to determine the frequency of respiratory function disorders and radiologic abnormalities among DLTs. MATERIALS AND METHODS: The study enrolled 94 DLTs who were exposed to dust in dental laboratories and 94 control subjects. Dust concentrations in the workplaces were measured. RESULTS: The mean age of DLTs was 30.70 +/- 9.84 years. No significant difference was found between the DLTs and the control groups for age or smoking status (p > 0.05). Spirometric values for the DLTs were found to be lower than the control group (p < 0.05). The mean working period for DLTs was 9.19 +/- 5.9 years. The pulmonary function test results for the DLTs showed that 65.9% had a normal pattern, 22.4% were restrictive, and 11.7% showed obstructive type pulmonary function disorder. Negative correlations were found between the working period time and Forced Expiratory Volume in 1 second in the DLTs (R = -0.675 p = 0.000). Negative correlations were also found between working period time and Forced Vital Capacity in the DLTs (R = -0.720 p = 0.000). All DLTs had chest X-rays and 16 (17%) of them showed radiological pneumoconiosis. CONCLUSIONS: This study showed a negative association between level of respiratory function and working period in DLTs.
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    Obstructive sleep apnoea, cigarette smoking and serum testosterone levels in a male sleep clinic cohort
    (Sage Publications Ltd, 2007) Kirbas, G.; Abakay, A.; Topcu, F.; Kaplan, A.; Unlu, M.; Peker, Y.
    This study evaluated the impact of obstructive sleep apnoea (OSA) and smoking on total serum testosterone levels in 96 men (mean age 43.3 years; range 25 - 60 years) attending a sleep clinic. Fifty-five men (57.3%) had OSA, defined as an apnoea-hypopnoea index of 2: 15 events/h, recorded during overnight polysomnography, and 42 (43.8%) were current smokers. Mean serum total testosterone levels were significantly lower in OSA subjects (3.4 ng/ml) than in non-OSA subjects (3.9 ng/ml), whereas no significant difference was observed between current smokers and nonsmokers. In a multiple linear regression analysis, serum testosterone was negatively correlated with body mass index and the apnoea-hypopnoea index, but not with age and pack-years of smoking. Our results support previous observations regarding testosterone levels in men with OSA, but, contrary to some earlier reports, there was no positive relationship between smoking and total testosterone in the present cohort.
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    Prognostic factors influencing survival in 35 patients with malignant peritoneal mesothelioma
    (Aepress Sro, 2014) Kaya, H.; Sezgi, C.; Tanrikulu, A. C.; Taylan, M.; Abakay, O.; Sen, H. S.; Abakay, A.
    Malignant mesothelioma is a rare but highly lethal form of cancer that affects the serosal membranes. Malignant peritoneal mesothelioma (MPM) is the second most common form of malignant mesothelioma (pleural mesothelioma is the most common). The aim of this study was to evaluate prognostic factors influencing the survival of patients with MPM. A retrospective analysis was performed on 35 patients who were admitted to our hospital between March 2005 and July 2013. The patients' demographic and clinical data, laboratory results, radiological signs, Eastern Cooperative Oncology Group (ECOG) performance status (PS), and treatment outcomes were evaluated. The mean age of the 35 patients was 59.0 +/- 14.4 years, the mean survival time was 16.2 +/- 12.9 months, and the majority of the histopathological types of MPM were epithelial (68.6%). 82.9% of the patients had been exposed to asbestos, and the mean duration of exposure was 28.3 +/- 14.5 years. The most frequent symptoms were abdominal distention/pain, weight loss, dyspnea, and chest pain. The mean interval between the onset of symptoms and the diagnosis was 4.6 +/- 3.3 months. Platinum-based combination chemotherapy in combination with supportive care was used in the treatment of 68.6% of the patients, while supportive treatment alone was used in the others. Our results revealed that patients who were >60 years old (p=0.019), who were exposed to asbestos >20 years (p=0.033), who had an ECOG PS of 3 (p=0.000) were more likely to have a poor MPM prognosis. In conclusion, increased age, duration of environmental asbestos exposure and ECOG PS are important factors that influence the prognosis of MPM patients.
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    Protective effects of caffeic acid phenethyl ester on isoniazid and rifampicin-induced hepatic and pancreatic injury
    (Univ West Indies Faculty Medical Sciences, 2021) Türkçü, G.; Avcı, Y.; Evliyaoğlu, O.; Gökalp, O.; Gümüş, M.; Tanrıkulu, A. C.; Abakay, A.; Büyükbayram, H.; Fırat, U.
    Objective: To investigate the protective effects of caffeic acid phenethyl ester (CAPE) against isoniazid (INH)- and rifampicin (RFP)-induced hepatic and pancreatic damage. Methods: Eighty adult rats were randomly divided into eight groups: control, INH, RFP, INII+RFP, INII+CAPE, RFP+CAPE, INII+RFP+CAPE, and CAPE. Both _MI and RFP were orally administered for 30 days at a dose of 50 mg/kg/day. Caffeic acid phenethyl ester was intraperitoneally injected for 30 days (10 mu mol/kg). Blood samples, hepatic and pancreatic tissues were obtained on day 30. Results: Total oxidant status levels were significantly higher in MI and/or RFP-treated groups than those of control and CAPE groups, while total antioxidant status and paraoxonase levels were significantly reduced in INH-RFP groups compared with the group receiving CAPE. Histopathological deterioration was observed in RFP and INH groups in pancreatic and hepatic tissue. However, significant amelioration was observed in CAPE-treated groups. Conclusion: Our findings suggest that CAPE may be a promising agent to prevent the side effects of INH and RFP treatment on hepatic and pancreatic tissues.
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    Relationship between 18 FDG PET-CT findings and the survival of 177 patients with malignant pleural mesothelioma
    (Verduci Publisher, 2013) Abakay, A.; Komek, H.; Abakay, O.; Palanci, Y.; Ekici, F.; Tekbas, G.; Tanrikulu, A. C.
    BACKGROUND AND OBJECTIVES: Malignant pleural mesothelioma (MPM) is a fatal malignancy. Radiological imaging is necessary for the diagnosis, staging, and clinical management of patients with MPM. The 18 fluorodeoxyglucose positron emission tomography (18 FDG-PET) scan has proven useful in preoperative staging and as a prognostic tool in MPM. We aimed to investigate the relationship between the pre-treatment 18 FDG PET/CT results, together with other known clinical parameters, and the survival of patients with MPM in our region. PATIENTS AND METHODS: A retrospective analysis was performed on the data of 177 patients with MPM between April 2007 and April 2011. Pretreatment 18 FDG PET/CT scans were done on all patients. Survival time was calculated by the Kaplan-Meier method. RESULTS: The mean age was 55.40 years. There were 56% male patients and 44% female patients. The mean survival time was 11 months from time of diagnosis. According to multivariate analysis results, being of male gender increased the poor prognosis 5.30 times, a Karnofsky performance score (KPS) < 60 increased a poor prognosis 2.18 times, being on best supportive care increased a poor prognosis 25.40 times, the stage III-IV increased a poor prognosis 11.13 times, and a level of maximum standardized uptake value (SUVmax) > 5 increased a poor prognosis 4.34 times. CONCLUSIONS: MPM remains a fatal prognosis. Significant predictors of survival include KPS, stage of disease, gender, treatment regimen and level of SUVmax. An understanding of the importance of these markers for MPM prognosis should allow targeted treatments to be developed.