Browsing by Author "Erden, Abdulsamet"

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Does Sunlight Exposure Improve Survival in Patients with Non-small Cell Lung Cancer?
(ASIAN PACIFIC ORGANIZATION CANCER PREVENTION, 2013-01-01) Mutlu, Hasan; Buyukcelik, Abdullah; Aksahin, Arzu; Kibar, Mustafa; Cihan, Yasemin Benderli; Kaya, Eser; Seyrek, Ertugrul; Yavuz, Sinan; Erden, Abdulsamet; Calikusu, Zuleyha; Aslan, Tuncay; Akca, Zeki
Background: Some epidemiological studies reported that sunlight exposure and highvitamin D levels may decrease the morbidity and mortality related to cancer. We aimed to evaluate whether sunlight exposure has an impact on survival in patients with non small cell lung cancer. Materials and Methods: A total of 546 patients with NSCLC from two different regions (Kayseri and Adana) differing according to sunlight exposure were analysed retrospectively. Results: The median overall survival (OS) rates were 11. 6 (CI: 9.50-13.6) and 15.6 months (CI: 12.4-18.8) for Kayseri and Adana, respectively, in all patients (p=0.880). Conclusions: There were no differences between groups in terms of OS. While there is strong evidence regarding inverse relationship between cancer incidence and sunlight exposure, it is still controversial whether sunlight exposure is a good prognostic factor for survival in patients with lung cancer.
Is Season a Prognostic Factor in Breast Cancer?
(ASIAN PACIFIC ORGANIZATION CANCER PREVENTION, 2013-01-01) Mutlu, Hasan; Akca, Zeki; Cihan, Yasemin Benderli; Kurnaz, Fatih; Aslan, Tuncay; Erden, Abdulsamet; Ugur, Hediye; Aksahin, Arzu; Buyukcelik, Abdullah
Background: Some studies have indicated an inverse relationship between cancer risk and sunlight exposure. Others have reported that the prognosis of some cancers such as prostate, colon, ovarian and non melanoma skin cancer, were affected by the season in which the cancer was diagnosed. In our study, we evaluated whether season is prognostic in Turkish patients with breast cancer. Materials and Methods: A total of 517 patients from Kayseri Training and Research Hospital were analysed retrospectively. Patients were divided into 4 groups according to season of cancer diagnosis: winter, spring, summer and autumn. The prognostic factors for disease free survival and overall survival were investigated. Results: No significant differences were found among groups regarding prognostic factors overall. Only estrogen receptor status and lymphovascular invasion were independent prognostic factors (p=0.001 and p=0.001 respectively). We found significantly differences for mean disease free survival among groups (p=0.019). Winter group had better mean DFS while summer group had worse DFS. Mean overall survival was similar in the four groups (p=0.637). Conclusions: The season is not an independent predictive factor. However, due to interaction with other factors, we think that the season of cancer diagnosis is important for cancer prognosis.
Is Sunlight a Predisposing Factor for Triple Negative Breast Cancer in Turkey?
(ASIAN PACIFIC ORGANIZATION CANCER PREVENTION, 2013-01-01) Mutlu, Hasan; Buyukcelik, Abdullah; Colak, Taner; Ozdogan, Mustafa; Erden, Abdulsamet; Aslan, Tuncay; Akca, Zeki
Intraduction: There is known to be a relationship between vitamin D level and more aggresive breast cancer subtypes, especially triple-negative breast cancer (TNBC). It was reported that sunlight exposure has an effect on the prognosis of patients with cancer, possibly related to the conversion of vitamin D to its active form with sunlight. We aimed to evaluate the effect of sunlight exposure on patients with TNBC. Materials-Methods: A total of 1,167 patients with breast cancer from two different regions of Turkey (Antalya and Kayseri, regions having different climate and sunlight exposure intensity over the year) were analysed retrospectively. The ratio of patients with TNBC was identified in those two regions. Results: The ratio of patients with TNBC was 8\% and 12\% for Kayseri and Antalya regions, respectively, and this difference between the two groups was statistically significant (p=0.021). Discussion: Sunlight exposure may be associated with more prevalent TNBC. This finding should be investigated with a prospective study.
Lack of Sunlight Exposure Influence on Primary Glioblastoma Survival
(ASIAN PACIFIC ORGANIZATION CANCER PREVENTION, 2014-01-01) Mutlu, Hasan; Akca, Zeki; Erden, Abdulsamet; Aslan, Tuncay; Ucar, Kadir; Kaplan, Bunyamin; Buyukcelik, Abdullah
Background: The prognosis of primary glioblastoma (GBM) is poor. Approximately 2/3 of primary brain tumor diagnoses are GBM, of which 95\% are primary lesions. In this study, we aimed to evaluate whether more sunlight exposure has an effect on survival of patients with primary GBM. Materials and Methods: A total of 111 patients with primary GBM were enrolled from Kayseri in inner Anatolia which has a cold climate (n: 40) and Mersin in Mediterranean region with a warm climate and more sunlight exposure (n: 71). The patients with primary GBM were divided into two groups as Kayseri and Mersin and compared for progression free survival (PFS) and overall survival (OS). Results: The PFS values were 7.0 and 4.7 months for Kayseri and Mersin groups, respectively (p=0.10) and the repsective OS values were 13.3 and 9.4 months (p=0.13). We did not found any significant difference regarding age, sex, comorbidity, smoking, surgery, resurgery, adjuvant chemoradiotherapy and palliative chemotherapy between the groups. Conclusions: We found that more sunlight exposure had no impact on prognosis of patients with primary GBM, adding inconsistency to the literature about the relationship between sunlight and GBM.
Secondline Chemotherapy Versus Best Supportive Care in Patient with Malignant Pleural Mesothelioma: A Retrospective Study
(ASIAN PACIFIC ORGANIZATION CANCER PREVENTION, 2013-01-01) Mutlu, Hasan; Buyukcelik, Abdullah; Karaca, Halit; Aksahin, Arzu; Berk, Veli; Aslan, Tuncay; Erden, Abdulsamet; Akca, Zeki; Ozkan, Metin
Introduction: Mesothelioma is a rare neoplasm arising from mesothelial surfaces with the malignant pleural mesothelioma (MPM) as the most common form. Secondline chemotherapy in MPM is still controversial and in this study we evaluated whether it is superior to best supportive care. Materials and Methods: A total of 51 patients with MPM from Acibadem Kayseri Hospital, Kayseri Training and Research Hospital and Erciyes University were analyzed retrospectively. The patients treated with secondline chemotherapies (SLCT) were compared with those treated with best supportive care (BSC) for overall survival. Results: The median overall survival (OS) for firstline chemotherapy -> SLCT and firstline chemotherapy -> BSC groups were 20.3 and 14.7 months respectively (p=0.079). After firstline chemotherapy the median OS for SLCT and BSC were 5.9 and 4.7 months (p=0.355). Discussion: Although there was a trend for improvement in overall survival in patients treated with secondline chemotherapy, the difference was not statistically significant. Our results do not support the proposal that secondline chemotherapy could be effective in patients with MPM.
Staging with PET-CT in Patients with Locally Advanced Non Small Cell Lung Cancer is Superior to Conventional Staging Methods in Terms of Survival
(ASIAN PACIFIC ORGANIZATION CANCER PREVENTION, 2013-01-01) Mutlu, Hasan; Buyukcelik, Abdullah; Erden, Abdulsamet; Aslan, Tuncay; Akca, Zeki; Kaya, Eser; Kibar, Mustafa; Seyrek, Ertugrul; Yavuz, Sinan; Calikusu, Zuleyha
Background: Of patients with non small cell lung cancer (NSCLC), around one third are locally advanced at the time of diagnosis. Because only a proprotion of stage III patients can be cured by surgery, in order to improve the outcomes, sequential or concurrent chemoradiation, or concurrent chemoradiation with induction or consolidation is offered to the patients with locally advanced NSCLC. Today, PET combined with computerized tomography (PET-CT) is accepted as the most sensitive technique for detecting mediastinal lymph node and extracranial metastases from NSCLC. We aimed to compare PET-CT and conventional staging procedures for decisions regarding curative treatment of locally advanced NSCLC. Materials and Methods: A total of 168 consecutive patients were included from Acibadem Kayseri Hospital, Acibadem Adana Hospital and Kayseri Research and Training Hospital in this study. Results: While the median PFS was 13.0 +/- 1.9 months in the PET-CT group, it was only 6.0 +/- 0.9 in the others (p<0.001). The median OS values were 20.5 +/- 15.6 and 11.5 +/- 1.5 months, respectively (p<0.001). Discussion: As a result, we found that staging with PET CT has better results in terms of survival staging. This superiority leads to survival advantage in patients with locally advanced NSCLC.
Survival Analysis of Biliary Tract Cancer Cases in Turkey
(ASIAN PACIFIC ORGANIZATION CANCER PREVENTION, 2014-01-01) Akca, Zeki; Mutlu, Hasan; Erden, Abdulsamet; Buyukcelik, Abdullah; Cihan, Yasemin Benderli; Goksu, Sema Sezgin; Aslan, Tuncay; Sezer, Emel Yaman; Inal, Ali
Background: Because of the relative rarity of biliary tract cancers (BTCs), defining long term survival results is difficult. In the present study, we aimed to evaluate the survival of a series of cases in Turkey. Materials and Methods: A totally of 47 patients with billiary tract cancer from Mersin Goverment Hospital, Acibadem Kayseri Hospital and Kayseri Training and Research Hospital were analyzed retrospectively using hospital records between 2006-2012. Results: The median overall survival was 19.3 +/- 3.9 months for all patients. The median disease free and overall survivals were 24.3 +/- 5.3 and 44.1 +/- 12.9 months in patients in which radical surgery was performed, but in those with with inoperable disease they were only 5.3 +/- 1.5 and 10.7 +/- 3.2 months, respectively. Conclusions: BTCs have a poor prognosis. Surgery with a microscopic negative margin is still the only curative treatment.