RESUMO
Colorectal cancer [CRC] is one of the most common cancers worldwide. But information regarding CRC in Iran is limited; the aim of this study was to investigate the epidemiologic features of CRC in Iran, using 6-year data from cancer registry. This survey was a descriptive-analytic study conducted on 1138 colorectal cancer patients who registered in Cancer Registry Center of Research Center for Gastroenterology and Liver Disease, Tehran, Iran. These data were gathered through interview and pathology reports recorded in cancer registry forms. Data analysis was performed by descriptive and univariate methods. Of 1138 patients, 696 cases were male. There was no significant difference between males and females regarding age at diagnosis. 400 patients [35.1%] had a family history of cancer. The most common histology type of tumor was adenocarcinoma, NOS. in most cases [39.1%] tumor grading was well differentiated and there was no significant difference between males and females. Colorectal cancer is a disease with nonspecific symptoms. Family history of cancer was evident in 35.1% of our cases and also 42.9% of patients were below the age of 50 years old, suggesting that genetic factors may play an important role in the development of this disease in our country