Colorectal Cancer Essay

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1.1 Introduction Colorectal cancer is considered to be a major cause of cancer morbidity and mortality. It accounts for over 9% of all cancer incidences; this makes it the third most common cancer cause with nearly 1.4 million new cases diagnosed in a year (WCRF, 2012) and the fourth most common cause of death (WHO, 2002). Both men and women are affected almost equally for colorectal cancer; 9.4% in men and 10.1% in women from all incident of cancer. However, it has a clear geographical variation which is not uniformly distributed throughout the world. It has been estimated that, the developed countries with a western culture accounts for over 63% of all colorectal cancer cases (Fatima AH, 2009). Though data available to show the clear situation in developing countries, growing evidences show that the problem would be also a concern for the low and middle income countries. The International Agency for Research on Cancer (IARC) was estimate that in 2008 colorectal cancer (CRC) is the 5th most common cancer in SSA (Ferlay J, 2010 and Alice G et.al, 2012) Several risk factors can be linked with the incidence of colorectal cancer. Age and hereditary factors are the most important factors on which an individual’s cannot able to manage. The probability of being affected by colorectal cancer is increases after the age of 40. More than 90% of colorectal cancer cases reported among people in the age greater than 50 and older (Fairley TL , 2006). In addition, a large number of environmental and behavioral risk factors can also contribute for the development of colorectal cancer; among these dietary factors are the major one (Fatima AH, 2009). With the help of different dietary assessment methods such as food recalls and food record,... ... middle of paper ... ...Lin L et.al, 2013). However, memory (recalls) and nutrient data are still influence estimates from the reference method (Jackson et. al, 2011, and Daures JP et. al, 2000 ). Generally, due to differences in food supply and dietary habits, there is no universally accepted FFQ that can be used for all populations in all situations. Elucidation of diet–disease relationships requires dietary assessment methods which can sufficiently describe and quantify intakes, minimize errors and provide precise estimates of variability between individuals or groups (Kaaks R et. al, 1997; Carroll RJ e t.al 1997 and Lin L et.al, 2013). Therefore, it is vital to make sure that any FFQ must be reliable and valid to be used in the population of interest, need to be designed to meet the aims of study populations and has contain an up-to-date list of foods (Jyh Eiin Wong, et. al, 2012).

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