Canceris caused when the body cells are exposed or infected by Chemicals,viruses, bacteria and radiations. Epidemiology of cancer can bedescribed as the study of how the cancer condition is distributedamong the population based on sex, age, economic status, as well asother relevant factors which affect its prevalence(Ncbi.nlm.nih.gov, 2014).About twenty years ago, the mortality rate in the U.S. population dueto malignancy cases were almost identical for both females and males(Ncbi.nlm.nih.gov, 2014).However, since that time, the number of cancer cases has increases inmales hence the present disparity. In the same time, the prevalenceof malignancy in women has slightly reduced.
Inthe recent past, the rate of mortality, especially, owing to cancerof the respiratory system has increased has had the greatest share ofthe number of cancer cases. The migration of people from one countryto another has also been proven to alter the level of risk ofexposure to cancer. The diseases’ pattern for migrants shifts toconform to that of the people in the country where they move to thehigher the risk of contracting cancer in the immigrant country, thehigher the risk is for the migrants, and the converse is also true(Ncbi.nlm.nih.gov, 2014).It is also noteworthy, that smokers are at higher risk of contractingbladder cancer than are the non-smokers(Ncbi.nlm.nih.gov, 2014).
Studieshave also evinced that occupational exposure is a great determinantof cancer’s prevalence. Specialists in cancer etiology linkphysical and chemical agents to be causative agents of cancer(Ncbi.nlm.nih.gov, 2014).It, therefore, goes that people who work in places where they areexposed to chemicals and radiations are at higher risks of havingcancer than others who do not work in such places. Successfulepidemiology of cancer has been facilitated by the setting up ofregional cancer registries for better diagnosis, data collection andanalysis.
Ncbi.nlm.nih.gov,.(2014). The epidemiology of cancer. – PubMed-NCBI. Retrieved 26 July 2014, fromhttp://www.ncbi.nlm.nih.gov/pubmed/20468457/