E-ISSN 2148-5607
Original Article
Epidemiology of colorectal cancer in Turkey: A cross-sectional disease registry study (A Turkish Oncology Group trial)
1 Department of Medical Oncology, İstanbul University Institute of Oncology, İstanbul, Turkey  
2 Department of Medical Oncology, Hacettepe University Medical Oncology, Ankara, Turkey  
3 Department of Medical Oncology, Marmara University Faculty of Medicine, İstanbul, Turkey  
4 Department of Medical Oncology, Akdeniz University Faculty of Medicine, Antalya, Turkey  
5 Department of Medical Oncology, İstanbul Bilim University Faculty of Medicine, İstanbul, Turkey  
6 Department of Medical Oncology, Erciyes University Faculty of Medicine, Kayseri, Turkey  
7 Department of Medical Oncology, Pamukkale University Faculty of Medicine, Denizli, Turkey  
8 Department of Medical Oncology, Gaziantep University Faculty of Medicine, Gaziantep, Turkey  
9 Department of Medical Oncology, Ankara University Faculty of Medicine, Ankara, Turkey  
10 Department of Medical Oncology, Selçuk University Faculty of Medicine, Konya, Turkey  
11 Department of Medical Oncology, Adnan Menderes University Faculty of Medicine, Aydın, Turkey  
12 Department of Medical Oncology, Kocaeli University Faculty of Medicine, Kocaeli, Turkey  
13 Department of Medical Oncology, Dicle University Faculty of Medicine, Diyarbakir, Turkey  
14 Department of Radiation Oncology, Gazi University Faculty of Medicine, Ankara, Turkey  
15 Department of Medical Oncology, Başkent University Faculty of Medicine, Adana, Turkey  
16 Department of Medical Oncology, İnönü University Faculty of Medicine, Malatya, Turkey  
17 Department of Medical Oncology, Mersin University Faculty of Medicine, Icel, Turkey  
18 Department of Medical Oncology, Atatürk University Faculty of Medicine, Erzurum, Turkey  
19 Department of Medical Oncology, Uludağ University Faculty of Medicine, Bursa, Turkey  
20 Department of Medical Oncology, Gülhane Military Medical Academy Faculty of Medicine, Ankara, Turkey  
21 Department of Medical Oncology, Fırat University Faculty of Medicine, Elazığ, Turkey  
22 Department of Cancer Epidemiology and Biostatistics, İstanbul University, Institute of Oncology, İstanbul, Turkey  
Turk J Gastroenterol 2015; 26: 145-153
DOI: 10.5152/tjg.2015.5685
Key Words: Colorectal cancer, epidemiology, risk factors, Turkey

Background/Aims: This study aimed to determine the epidemiological characteristics of colorectal cancer in Turkey.


Materials and Methods: In this multicenter, prospective, and cross-sectional registry study, data for 968 patients with colorectal cancer from 21 centers in 7 geographic regions were analyzed.


Results: Diagnosis was colon cancer in 662 (68.4%) and rectum cancer in 306 (31.6%) patients. In total, 60.9% of patients was male; mean age was 58.9±12.6 years. Among patients, 15.0% was drinking alcohol, 17.5% was smoking, 1.5% had familial history of polyposis, 15.0% had diabetes mellitus, 1.0% had inflammatory bowel disease. Fruit and vegetable consumption was low (<3 times/week) in 35.5% and red meat consumption was high (≥3 times/week) in 47.4% of the patients. Median time-to diagnosis was 3.0 months and 4.0 months for patients with colon and rectum cancer, respectively. Mean body mass index was >25 in all group of patients. Distal rectum (61.3%) and sigmoid colon (36.8%) were the most common locations of cancer, for rectum and colon respectively. In total, 85.6% of patients were operated; 25.8% had emergency surgery. Low anterior resection rate was 64.2% in rectum cancer. In majority (89.8%) of the patients with rectum cancer who received preoperative treatment, conventional chemo-radiotherapy regimen was given. pTNM staging at diagnosis showed that stage III and IV patients were in majority (35.9% and 29.7%, respectively).



Conclusion: Colon cancer is more frequent than rectum cancer in Turkey. Colorectal cancer patients are diagnosed at later stages. Most of the cases were operated. Interregional differences for risk factors are worthwhile for evaluation in future trials. 

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