Publications by authors named "Omur Karakoyun-Celik"

11 Publications

  • Page 1 of 1

Practice patterns for oropharyngeal cancer in radiation oncology centers of Turkey.

Tumori 2014 May-Jun;100(3):284-8

Aims And Background: The aim of the study was to review the current clinical practices of radiation oncologists involved in the treatment of oropharyngeal cancer.

Methods And Study Design: The daily practices of radiation oncology centers for patients diagnosed with oropharyngeal cancer in 2010 were evaluated by a two-part questionnaire that separately assessed the information of the participating center and the charts of the treated patients.

Results: A total of 22 centers participated in the study, and 105 oropharyngeal cancer patients reported for our review. The use of positron emission tomography was a common practice in staging and radiotherapy planning. Multidisciplinary head and neck cancer clinics were available in 14 (64%) centers and were absent in 8 centers. Thirty-six of the 105 patients were not evaluated by a multidisciplinary clinic before the initiation of therapy, and adjuvant radiotherapy administration was found to be higher in this group. Percutaneous endoscopic gastrostomy tube placement was not a routine practice in any of the centers. Seventy-five patients received chemotherapy - 46 concurrently with radiotherapy and 29 as induction chemotherapy. Two centers administered conventional radiotherapy alone, 20 centers conformal radiotherapy, and 7 centers were able to provide intensity-modulated radiotherapy.

Conclusions: Across all the centers there were small differences in the pretreatment evaluation of patients with oropharyngeal cancer. The greatest difference was in the technical delivery of radiation, with most of the centers using conformal radiotherapy despite the increasing availability of intensity-modulated radiotherapy. The use of chemotherapy has more readily adopted the current international standards in the treatment of oropharyngeal cancer.
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http://dx.doi.org/10.1700/1578.17204DOI Listing
November 2014

Health care reforms in Turkey and their impact on the field of radiation oncology.

Int J Radiat Oncol Biol Phys 2014 Mar;88(3):549-51

Department of Radiation Oncology, Celal Bayar University Hospital, Ismir, Turkey.

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http://dx.doi.org/10.1016/j.ijrobp.2013.10.012DOI Listing
March 2014

Can carotid-sparing radiotherapy approaches replace with conventional techniques for the patients with T1 glottic larynx cancer?

Kulak Burun Bogaz Ihtis Derg 2012 Sep-Oct;22(5):267-74

Department of Radiation Oncology, Van Regional Training and Research Hospital, Van, Turkey.

Objectives: This study aims to compare the carotid artery doses applied with various radiotherapy techniques for the treatment of T1N0 glottic larynx cancer.

Patients And Methods: Five patients were simulated with using computed tomography (CT). Clinical (CTV) and planning target volumes (PTV) were created for T1N0 glottic larynx cancer. Planning risk volumes (PRV) were constructed for carotid arteries and spinal cord. Three irradiation planning, opposed lateral box field (OLBF), three dimension conformal radiation therapy (3DCRT), intensity modulated radiation therapy (IMRT) were done for each patient. Over 95% of planned target volumes were loaded with predetermined dose (a total of 62.25 Gy of 2.25 Gy daily dose).

Results: The comparison of the treatment planning of five T1 glottic larynx cancer, three involving the right vocal cord and two involving the left vocal cord, the technique of IMRT planning was provided the best carotid-sparing doses. Mean carotid V35, V50, and V63 values including OLBF, 3DCRT, and IMRT were 70%, 47%, 35%; 55%, 15%, 5% and 28%, 6%, 0%, respectively. The statistical comparison of V35, V50 and V63 revealed significant values for OLBF and IMRT. Dose of spinal cord did not exceed 45 Gy for any of radiation treatment planning. Between the three techniques, there was no significant difference in terms of conformity index and dose distribution was homogenous with all techniques.

Conclusion: It is obvious that IMRT planning technique can decrease the carotid artery radiation doses in early stage glottic larynx cancer.
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http://dx.doi.org/10.5606/kbbihtisas.2012.052DOI Listing
March 2015

A review for solitary plasmacytoma of bone and extramedullary plasmacytoma.

ScientificWorldJournal 2012 2;2012:895765. Epub 2012 May 2.

Radiation Oncology Clinic, Okmeydani Training and Research Hospital, Ministry of Health, Istanbul, Turkey.

Solitary plasmacytoma (SP) is characterized by a mass of neoplastic monoclonal plasma cells in either bone (SBP) or soft tissue without evidence of systemic disease attributing to myeloma. Biopsy confirmation of a monoclonal plasma cell infiltration from a single site is required for diagnosis. The common presentation of SBP is in the axial skeleton, whereas the extramedullary plasmacytoma (EMP) is usually seen in the head and neck. The ratio of SP seen at males to females is 2 : 1 and the median age of patients is 55 years. The incidence rate of SP in black race is approximately 30% higher than the white race. Incidence rate increases exponentially by advancing age. SBP has a significant higher risk for progression to myeloma, and the choice of treatment is radiotherapy (RT) that is applied with curative intent at min. 4000 cGy. By only RT application, long-term disease-free survival (DFS) is possible for approximately 30% of patients with SBP and 65% of patients with EMP.
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http://dx.doi.org/10.1100/2012/895765DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3354668PMC
September 2012

Outcome and prognostic factors in olfactory neuroblastoma: a rare cancer network study.

Int J Radiat Oncol Biol Phys 2010 Nov 16;78(4):992-7. Epub 2010 Mar 16.

Department of Radiation Oncology, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland.

Purpose: To assess the outcome in patients with olfactory neuroblastoma (ONB).

Methods And Materials: Seventy-seven patients treated for nonmetastatic ONB between 1971 and 2004 were included. According to Kadish classification, there were 11 patients with Stage A, 29 with Stage B, and 37 with Stage C. T-classification included 9 patients with T1, 26 with T2, 16 with T3, 15 with T4a, and 11 with T4b tumors. Sixty-eight patients presented with N0 (88%) disease.

Results: Most of the patients (n = 56, 73%) benefited from surgery (S), and total excision was possible in 44 patients (R0 in 32, R1 in 13, R2 in 11). All but five patients benefited from RT, and chemotherapy was given in 21 (27%). Median follow-up period was 72 months (range, 6-315). The 5-year overall survival (OS), disease-free survival (DFS), locoregional control, and local control were 64%, 57%, 62%, and 70%, respectively. In univariate analyses, favorable factors were Kadish A or B disease, T1-T3 tumors, no nodal involvement, curative surgery, R0/R1 resection, and RT-dose 54 Gy or higher. Multivariate analysis revealed that the best independent factors predicting the outcome were T1-T3, N0, R0/R1 resection, and total RT dose (54 Gy or higher).

Conclusion: In this multicenter retrospective study, patients with ONB treated with R0 or R1 surgical resection followed by at least 54-Gy postoperative RT had the best outcome. Novel strategies including concomitant chemotherapy and/or higher dose RT should be prospectively investigated in this rare disease for which local failure remains a problem.
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http://dx.doi.org/10.1016/j.ijrobp.2009.09.019DOI Listing
November 2010

Postoperative radiotherapy in the management of resected non-small-cell lung carcinoma: 10 years' experience in a single institute.

Int J Radiat Oncol Biol Phys 2010 Feb 20;76(2):433-9. Epub 2009 Apr 20.

Department of Radiation Oncology, Celal Bayar University Medical School, Manisa, Turkey.

Purpose: This study reports the long term outcomes of postoperative radiotherapy in patients with resection for non-small-cell lung cancer (NSCLC).

Methods And Materials: A total of 98 patients with resected NSCLC who received postoperative radiotherapy (PORT) between January 1994 and December 2004 were retrospectively analyzed. The most frequently performed surgical procedure was lobectomy (59 patients), followed by pneumonectomy (25), wedge resection (8), and bilobectomy (6). Postoperative radiotherapy was delivered as an adjuvant treatment in 71 patients, after a wedge resection in 8 patients, and after an R1 resection in 19 patients. The PORT was administered using a Co-60 source in 86 patients and 6-MV photons in 12 patients. A Kaplan-Meier estimate of overall survival, locoregional control, and distant metastasis-free survival were calculated.

Results: Stages included I (n =13), II (n = 50), IIIA (n = 29), and IIIB (n = 6). After a median follow-up of 52 months median survival was 61 months. The 5-year overall survival, locoregional control, and distant metastasis-free survival rates for the whole group were 50%, 78%, and 55% respectively. The RT dose, Karnofsky performance status, age, lateralization of the tumor, and pneumonectomy were independent prognostic factors for OAS; anemia and the number of involved lymph nodes were independent prognostic factors for LC.

Conclusions: Doses of PORT of greater than 54 Gy were associated with higher death rate in patients with left-sided tumor, which may indicate a risk of radiation-induced cardiac mortality.
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http://dx.doi.org/10.1016/j.ijrobp.2009.02.010DOI Listing
February 2010

Depression and anxiety levels in woman under follow-up for breast cancer: relationship to coping with cancer and quality of life.

Med Oncol 2010 Mar 19;27(1):108-13. Epub 2009 Feb 19.

Department of Radiation Oncology, Celal Bayar University Medical School, Manisa, Turkey.

Aim: The relation of anxiety and depression levels with characteristics of coping with the disease and quality of life were evaluated in women under follow-up for breast cancer.

Materials And Methods: Patients who had presented to the breast cancer polyclinics for follow-up were evaluated. The Beck Depression and the State-Trait Anxiety inventories were used in the evaluation of depression and anxiety levels. In order to evaluate their power to cope with cancer, the patients were questioned for a social support network. EORTC QLQ-C30 and QLQ-BR23 questionnaires were applied for quality of life evaluations.

Results: There were 23 (19%) patients with depression; 3 (2.5%) with grade I anxiety, 94 (77%) grade II, and 23 (19%) grade III anxiety, respectively. Depression and anxiety levels were affected by the following parameters: being unaccompanied by spouse for hospital follow-ups (P < 0.0001); request to get help by a psychologist (P = 0.02); presence of a person to share their problems (P < 0.0001); and using an alternative treatment (P = 0.04). In the quality of life evaluations, difficulty in sleeping, emotional status, fatigue, and body appearance were related with both depression and anxiety (P < 0.05 for all), whereas physical function (P = 0.002), role performance (P = 0.005), cognitive condition (P < 0.0001), social position (P < 0.0001), pain (P < 0.0001), general health (P < 0.0001), treatment methods (P = 0.001), future anxiety (P < 0.0001), and arm symptoms (P = 0.001) were negatively affected in patients with depression.

Conclusion: High depression and anxiety levels in patients under follow-up for breast cancer influence the coping with cancer and quality of life adversely.
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http://dx.doi.org/10.1007/s12032-009-9181-4DOI Listing
March 2010

Patterns of care for lung cancer in radiation oncology departments of Turkey.

Int J Radiat Oncol Biol Phys 2008 Dec 15;72(5):1530-7. Epub 2008 Aug 15.

Dokuz Eylul University Medical School, Department of Radiation Oncology, Izmir, Turkey.

Purpose: To determine the patterns of care for lung cancer in Turkish radiation oncology centers.

Methods And Materials: Questionnaire forms from 21 of 24 (87.5%) centers that responded were evaluated.

Results: The most frequent histology was non-small cell lung cancer (NSCLC) (81%). The most common postoperative radiotherapy (RT) indications were close/(+) surgical margins (95%) and presence of pN2 disease (91%). The most common indications for postoperative chemotherapy (CHT) were ">/= IB" disease (19%) and the presence of pN2 disease (19%). In Stage IIIA potentially resectable NSCLC, the most frequent treatment approach was neoadjuvant concomitant chemoradiotherapy (CHRT) (57%). In Stage IIIA unresectable and Stage IIIB disease, the most frequent approach was definitive concomitant CHRT (91%). In limited SCLC, the most common treatment approach was concomitant CHRT with cisplatin+etoposide for cycles 1-3, completion of CHT to cycles 4-6, and finally prophylactic cranial irradiation in patients with complete response (71%). Six cycles of cisplatin + etoposide CHT and palliative thoracic RT, when required, was the most commonly used treatment (81%) in extensive SCLC. Sixty-two percent of centers did not have endobronchial brachytherapy (EBB) facilities.

Conclusion: There is great variation in diagnostic testing, treatment strategies, indications for postoperative RT and CHT, RT features, and EBB availability for LC cases. To establish standards, national guidelines should be prepared using a multidisciplinary approach.
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http://dx.doi.org/10.1016/j.ijrobp.2008.03.035DOI Listing
December 2008

Clinical and prognostic features of plasmacytomas: a multicenter study of Turkish Oncology Group-Sarcoma Working Party.

Am J Hematol 2008 Sep;83(9):702-7

Department of Radiation Oncology, Faculty of Medicine, Gaziantep University, Gaziantep, Turkey.

To identify the outcomes of prognostic factors of solitary plasmacytoma mainly treated with local radiotherapy (RT). The data were collected from 80 patients with solitary plasmacytoma (SP). Forty patients (50.0%) received radiotherapy (RT) alone while 38 of them (47.5%) were treated with surgery (S) and RT. The median radiation dose was 46 Gy (range 30-64). The median follow up was 2.41 years (range 0.33-12.33). Ten-year overall survival (OS) and local relapse-free survival (LRFS) were 73% and 94%, respectively. The median progression-free survival (PFS) and multiple myeloma-free survival (MMFS) were 3.5 years and 4.8 years, respectively. On multivariate analyses, the favorable factors were radiotherapy dose of > or =50 Gy and RT + S for PFS and younger age for MMFS. For the patients with medullary plasmacytoma, the favorable factor was younger age for MMFS. RT at > or =50 Gy and RT + S may be favorable prognostic factors on PFS. Younger patients, especially with head-neck lesion and without pre-RT macroscopic tumor, seem to have the best outcome when treated with RT +/- S. Progression to MM remains as the main problem especially for older patients.
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http://dx.doi.org/10.1002/ajh.21211DOI Listing
September 2008

High dose rate endobronchial brachytherapy in the management of lung cancer: response and toxicity evaluation in 158 patients.

Lung Cancer 2008 Dec 14;62(3):326-33. Epub 2008 May 14.

Ege University, Faculty of Medicine, Department of Radiation Oncology, Izmir, Turkey.

The aim of this study was to evaluate the symptomatic and endoscopic responses as well as the toxicities in 158 patients with endobronchial lung cancer treated with high dose rate endobronchial brachytherapy (HDR-EB). Forty-three patients with stage III NSCLC were treated with 60Gy external beam radiotherapy (ERT) and three applications of 5Gy each of HDR-EB (group A). Seventy-four patients who did not receive previous RT were treated with 30Gy ERT and two applications of 7.5Gy HDR-EB with palliative intent (group B). Forty-one patients with recurrent tumor who were irradiated previously were treated with three applications of 7.5Gy HDR-EB, with palliative intent (group C). In group A, bronchoscopic complete (CR) and overall response rates (ORR) were 67% and 86%, respectively. Symptomatic improvement was obtained in 58% of patients with cough, 77% of patients with dyspnea and 100% of patients with hemoptysis. Two and 5-year survival rates were 25.5% and 9.5%, respectively and the median survival time (MST) was 11 months. In group B, the bronchoscopic CR and ORR were 39% and 77%, respectively and 28% and 72% in group C. The symptomatic response rates were 57% and 55% for cough, 90% and 78% for dyspnea and 94% and 77% for hemoptysis, with a MST of 7 and 6 months in Groups B and C, respectively. Eighteen patients (11%) died of fatal hemoptysis (FH) with the median time to this event of 7 months. Treatment intent (p<0.001), total BED (p<0.001) and the number of HDR-EB fractions (p<0.001) were significant prognostic factors for FH. HDR-EB provides effective palliation in relieving the symptoms of patients with endobronchial lung cancer, however, there is a risk of developing FH that is associated with a high BED and multiple HDR-EB applications.
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http://dx.doi.org/10.1016/j.lungcan.2008.03.018DOI Listing
December 2008

Definitive radiotherapy with interstitial implant boost for squamous cell carcinoma of the tongue base.

Head Neck 2005 May;27(5):353-61

Department of Radiation Oncology, Massachusetts General Hospital, 100 Blossom Street, Cox 3, Boston, MA 02114, USA.

Background: The purpose of this study was to examine the long-term outcome of a cohort of patients with unresected base of tongue carcinoma who received interstitial brachytherapy after comprehensive external beam radiation therapy.

Methods: Between 1983 and 2000, 122 patients with primary or recurrent squamous cell carcinoma of the oropharynx or oral cavity received interstitial brachytherapy as part of their overall management. Forty patients had primary, unresected carcinoma of the base of tongue and are the subjects of this analysis. The median age was 54 years. Fifty-four percent had T3 or T4 disease, and 70% had clinical or radiographic lymphadenopathy. Twenty-four (60%) received two to three cycles of neoadjuvant chemotherapy. The oropharynx, bilateral neck, and supraclavicular fossae were comprehensively irradiated, and the tongue base received a median external beam dose of 61.2 Gy (50-72 Gy). The primary site was then boosted with an interstitial 192Iridium implant by use of a gold-button single-strand technique and three-dimensional treatment planning. The dose rate was prescribed at 0.4 to 0.5 Gy/hr. The median implant dose was 17.4 Gy (9.6-24 Gy) and adjusted to reach a total dose to the primary tumor of 80 Gy. N2 to 3 disease was managed by a planned neck dissection performed at the time of the implant.

Results: The median follow-up for all patients was 56 months, and the overall survival rates were 62% at 5 years and 27% at 10 years. The actuarial primary site control was 78% at 5 years and 70% at 10 years. The overall survival and primary site control were independent of T classification, N status, or overall stage. Systemic therapy was associated with an improvement in overall survival (p = .04) and a trend toward increased primary site control with greater clinical response. There were seven documented late effects, the most frequent being grade 3 osteonecrosis (n = 2), grade 2 swallowing dysfunction (n = 2), trismus (n = 2), and chronic throat pain (n = 1).

Conclusions: In an era of greatly improved dose distributions made possible by three-dimensional treatment planning and intensity-modulated radiation therapy, brachytherapy allows a highly conformal dose to be delivered in sites such as the oropharynx. If done properly, the procedure is safe and delivers a dose that is higher than what can be achieved by external beam radiation alone with the expected biologic advantages. The long-term data presented here support an approach of treating advanced tongue base lesions that includes interstitial brachytherapy as part of the overall management plan. This approach has led to a 78% rate of organ preservation at 5 years, with a 5% incidence of significant late morbidity (osteonecrosis) that has required medical management.
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http://dx.doi.org/10.1002/hed.20171DOI Listing
May 2005