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Öğe APPLYING A NOVEL STATISTICAL METHOD TO DETERMINATION OF DISEASE-FREE SURVIVAL IN BREAST CANCER PATIENTS(Elsevier Ireland Ltd, 2008) Tokatli, F.; Ture, M.; Kurt, I.; Alas, R. Cosar; Uzal, C.[Abstract Not Available]Öğe Can radiation-induced chronic oxidative stress in kidney and liver be prevented by dimethylsulfoxide? Biochemical determination by serum and tissue markers(Imprimatur Publications, 2012) Cosar, R.; Eskiocak, S.; Caloglu, V. Yurut; Ozen, A.; Uzal, C.; Caloglu, M.; Ibis, K.Purpose: To investigate the protective effects of dimethylsulfoxide (DMSO) on chronic oxidative stress in the liver, kidney and serum with biochemical parameters such as malondialdehyde (MDA), advanced oxidation protein product (AOPP), catalase, glutathione (GSH), and free-thiols (F-SW. Methods: Thirty Wistar albino female rats were randomly divided into 3 groups: group [(control, n=10), group H (irradiation-alone group, n=10) and group III (DMSO and irradiation group, n=10). Rats in groups II and III were irradiated with a single dose of 6 Gy to the entire liver and right kidney. Group III received DMSO 4.5 g/kg by intraperitoneal injection 30 min before irradiation. At the end of the 24th week, the rats were sacrificed and their trunk blood, kidney and liver tissues were collected. Results: Group II rats showed increased levels of lipid peroxidation and protein oxidation, with decreased GSH, F-SH and catalase levels in all specimens when compared with group I. Serum and kidney MDA and AOPP levels were significantly lower in group III when compared with group II. However, serum and kidney GSH and F-SH levels were significantly higher in group III when compared with group II. The additive effect on catalase was seen only in the serum. Conclusion: DMSO is a protective agent on chronic oxidative stress in the serum and kidney tissue. No oxidant or antioxidant effect of DMSO in the liver was seen.Öğe Can Radiation-Induced Chronic-Oxidative Stress in Kidney and Liver Be Prevented by Dimethyl Sulfoxide? Biochemical Determination by Serum and Tissue Markers(Elsevier Sci Ltd, 2011) Cosar, R.; Eskiocak, S.; Yurut-Caloglu, V.; Ozen, A.; Uzal, C.; Caloglu, M.; Ibis, K.[Abstract Not Available]Öğe Chemotherapy and cerebrovascular disease(Zerbinis Medical Publ, 2008) Saynak, M.; Cosar-Alas, R.; Yurut-Caloglu, V.; Caloglu, M.; Kocak, Z.; Uzal, C.Cerebrovascular disease is common in cancer patients. Some tumors are at high risk for cerebrovascular complications. The development of cerebrovascular disease may be provoked by cancer treatment. No well-planned prospective studies about other causes of thrombosis are available, although various case reports about thrombosis related to chemotherapy have been published. L-asparaginase, cisplatin, 5-fluorouracil (5-FU) and methotrexate are anticancer agents which are reported to relate to stroke. The mechanisms by which antineoplastic agents may lead to stroke include endothelium toxicity and abnormalities of coagulation factors. Also, brain hemorrhages that could result from chemotherapy effects on the hemostatic system were reported. Besides, it is difficult to determine whether stroke is caused by chemotherapy or cancer itself Clinicians deal not only with problems originating from cancer itself but also with the complications resulting from its treatment. Treatment-induced cerebrovascular disorders affect quality of life and survival in cancer patients. For this reason, cancer treatment should be planned by taking into consideration the possibility of cerebrovascular complications.Öğe Comparison of Protective Effects of Melatonin and Amifostine on Radiation-Induced Renal Oxidative Stress in Rats(Hellenic Veterinary Medical Soc, 2020) Cakina, S.; Gulyasar, T.; Ozen, A.; Parlar, S.; Cukur, Z.; Kurkcu, N.; Uzal, C.In this study, we aimed to compare the protective effects of melatonin and amifostine on radiation-induced oxidative stress. Fifty female Wistar rats (3-4 months old, weighing 200 +/- 25 g) were divided into five groups (with ten rats each) and treated as follows: control (Cont), radiotherapy alone (RT), radiotherapy + amifostine (RT+A-MI), radiotherapy + melatonin (RT+MEL), radiotherapy + amifostine + melatonin (RT+AMI+MEL). Rats were irradiated individually with a single dose of 8 Gy and amifostine (200 mg/kg) and melatonin (10 mg/kg) was administered to rats 30 minutes before irradiation. At the end of this follow-up period (72 hours) the rats were sacrificed. Spectrophotometric Analysis has been performed to kidney tissue samples. As a result of statistical comparison between groups after RT, total antioxidant capacity (TAC) decreased, total oxidant status (TOS) and oxidative stress index (OSI) increased, although the statistically significant change was only for OSI (p = 0.030). Addition of AMI or MEL to RT increased TAC and OSI significantly (p = 0.000), but there was no additive effect for TAC and OSI when both drugs were given together (p = 1.000, p = 0.172, respectively). In terms of TOS, statistically significant increasing was only for AMI (p = 0.000). There was protective effect when both drugs were given together against on Radiation-Induced Renal Oxidative Stress.Öğe Comparison of Tc99m Tetrofosmin scintigraphy, Doppler sonography and Microvessel Density As Assessment of tumor angiogenesis after morphine administration(Springer, 2008) Ustun, F.; Durmus-Altun, G.; Tuncbilek, N.; Altaner, S.; Uzal, C.; Berkarda, S.[Abstract Not Available]Öğe The effect of gender differences on radiation induced acute lung toxicity by using XRCC1, XRCC3 and HHR2L gene panel(Elsevier Ireland Ltd, 2015) Ozen, A.; Cakina, S.; Turkkan, G.; Cosar, R.; Sipahi, T.; Kocak, Z.; Uzal, C.[Abstract Not Available]Öğe Evaluation of swallowing function with clinical and dosimetric parameters in head and neck cancer patients receiving radio (chemo)therapy(Ijrr-Iranian Journal Radiation Res, 2019) Turkkan, G.; Caloglu, M.; Yurut-Caloglu, V; Karasalihoglu, A. R.; Dogan, M.; Uzal, C.Background: This study aimed to evaluate the relationship between late dysphagia and dosimetric-clinical parameters in patients receiving radiotherapy for head and neck cancer (HNC). Materials and Methods: Twenty-six HNC patients treated with three-dimensional conformal radiotherapy were evaluated. A total dose of 66-70 Gy in 33-35 fractions was administered for curative purposes. Six swallowing organs at risk were contoured for each patient: the superior, middle and inferior pharyngeal constrictor muscles (SPCM, MPCM and IPCM); the cervical oesophagus (CE); the base of tongue (BOT); and the larynx. The mean dose in Gray [Dmean (Gy)], maximum dose in Gray [Dmax(Gy)] and percentages of organ volumes receiving >= 50 Gy, >= 60 Gy and >= 70 Gy [V50 (%), V60 (%) and V70 (%), respectively] were calculated from the dose-volume histograms for each structure. Dysphagia was evaluated using video laryngoscopy, the European Organization for Research and Treatment of Cancer quality of life module for HNC and the Leipzig scale. Results: Dmean, V60 and V70 for the BOT; Dmean and V60 for the SPCM; Dmean, Dmax, V60 and V70 for the IPCM; Dmean, Dmax, V60 and V70 for the larynx; and Dmean, Dmax, V50 and V70 for the CE were correlated with the presence of pharyngeal secretion. Only V50 for the CE was correlated with abnormal glottic closure. Dmean, Dmax, V60 and V70 for the BOT and the SPCM were correlated with liquid swallowing problems. Dmax for the MPCM; Dmean, Dmax, V60 and V70 for the IPCM; and Dmax, V60 and V70 for the CE were correlated with the Leipzig score. Conclusion: The dose-volume parameters of swallowing organs were found to be associated with different rates of late dysphagia in HNC patients receiving radiotherapy. The identification of dosimetric parameters that predict late dysphagia is not adequate yet. Well-designed multi-institutional studies are necessary to clarify the dose-volume constraints.Öğe Prognostic factors other than the performance status and age for glioblastoma multiforme: a single-institution experience(Imprimatur Publications, 2009) Caloglu, M.; Yurut-Caloglu, V.; Karagol, H.; Bayir-Angin, G.; Turan, F. N.; Uzal, C.Purpose: To evaluate the survival of patients with glioblastoma multiforme (GBM) and analyse the prognostic Actors influencing survival. Patients and methods: Seventy-eight consecutive patients with GBM treated with radiotherapy (RT) and temozolomide (TMZ) (in 21 patients) between 1999 and 2006 were retrospectively analysed. Results: Sixty-seven (85.5%) patients had undergone gross total or subtotal resection before RT The median overall survival was 9.8 months, and significantly influenced by age (p=0.02), Karnofsky performance status (p=0.001), RT (p<0.0001), gender (p=0.02), concomitant TMZ (p=0.003), RT waiting time (p=0.014), and treatment time (p=0.01) in univariate analysis. In multivariate analysis, older age (p=0.03), male gender (p=0.01), absence of concomitant TMZ (p=0.008), RT dose below 60 Gy (p=0.03), RT waiting time more than 20 days (p=0.01), and treatment time more than 76 days (p=0.0072) were poor prognosticators. Conclusion: This study emphasizes the importance of female gender, dose and duration of RT and RT waiting time in patients with glioblastoma multiforme.Öğe The protective effect of L-carnitine on ionizing radiation-induced free oxygen radicals(Scandinavian Soc Laboratory Animal Science, 2006) Dokmeci, D.; Akpolat, M.; Aydogdu, N.; Uzal, C.; Doganay, L.; Turan, F. N.Ionizing radiation is known to generate reactive oxygen species (ROS) that can be removed by antioxidants. L-carnitine, a natural component of mammalian tissue, is a necessary factor in the utilization of long-chain fatty acids to produce energy. Furthermore it has been shown that L-carnitine is an antioxidant which has a scavenger effect on ROS and a stabilizing effect on damaged cell membranes. The aim of the study was to evaluate the potential protective effect of L-carnitine on radiation-induced free radicals in hamsters. L-carnitine was given by gavage at a dose of 50 mg/kg for 15 consecutive days before irradiation with a single dose of 8 Gy. 24 h after radiation exposure, the hamsters were sacrificed and samples were taken from blood and tissues, and the biochemical and histopatological determinations were carried out. In the irradiated group, there were significant increases in plasma and liver malondialdehyde (MDA) with marked reduction in glutathione (GSH) levels in the liver, compared with controls. In red blood cells, superoxide dismutase (SOD) and catalase activities were also reduced. All these effects were reversed by L-carnitine. In conclusion, L-carnitine with its antioxidant and free radical scavenging properties could play a modulatory role against the cellular damage produced by free radicals induced by ionizing radiation.Öğe THE ROLE OF IONIZING RADIATION ON OVULATION RATE AND OOCYTE MORPHOLOGY IN MOUSE(Akademiai Kiado Zrt, 2014) Sapmaz-Metin, Melike; Kanter, M.; Uzal, C.We investigated the effects of ionizing radiation on maturation ability and radiosensitivity of oocytes enclosed in preantral and antral follicles. Balb/c female mice received total body single dose gamma radiation (7.2 Gy) at the diestrous to proestrous transition period. In the first experiment, spontaneously ovulated oocytes were collected from irradiated animals. In the second experiment, irradiated animals were allowed to superovulate to assess the ovarian function. The spontaneous ovulation rate of the follicles exposed at antral stage was significantly lower than the sham-irradiated mice (p < 0.01), and most of the oocytes were found at the metaphase I stage. Oocyte morphology and the ovulation rate of the follicles exposed at preantral stage were similar to the sham-irradiated group. Minimal morphological abnormalities were observed in the oocytes and the polar body as well. The superovulation response of all the irradiated animals was lower than the respective control animals. The superovulation rate was significantly lower in the first ovulation after irradiation (p < 0.01). In conclusion, our findings indicate that total body gamma irradiation, on a basis of estrous cycle stages, leads to ovulation failure in the antral stage while causes abnormal oocyte morphology in the preantral stage follicles in mice.Öğe Successful treatment of primary non-Hodgkin's lymphoma of the vulva with radiation therapy(Imprimatur Publications, 2009) Tokatli, F.; Oz-Puyan, F.; Alas, R.; Usta, U.; Yilmaz, H.; Uzal, C.Vulva, as a primary site of malignant lymphoma in women, is extremely rare. We report herein an 83-year-old patient with a primary, stage IIE vulvar, follicular center cell, B-cell lineage non-Hodgkin's lymphoma (NHL), with an excellent response to radiation therapy and event-free survival of 18 months. Early-stage primary vulvar NHL can be successfully treated only by limited fields irradiation.Öğe Sudden death: A case report of hepatocellular carcinoma with tumor thrombus extending into the right atrium(Zerbinis Medical Publ, 2007) Saynak, M.; Ozen, A.; Kocak, Z.; Cosar-Alas, R.; Uzal, C.[Abstract Not Available]
