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Colorectal Cancer : The Third Most Common Type Of Cancer

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Introduction
Colorectal cancer (CRC) is ranked as the third most common type of cancer in women. Furthermore, it is the fourth most dominant kind of cancer in men recorded all over the world. Consequently, CRC accounts for over a million new cases and more than half a million deaths every year. Colonoscopy allows early discovery and removal of precancerous lesions and may, therefore, effectively prevent or reduce the risk of Colorectal cancer. Although studies under hugely standardized conditions have shown that colonoscopy is linked with a 76% to 90% risk reduction of colorectal cancer in individuals with colorectal polyps, its effectiveness in preventing this type of cancer, especially in the community environment, is not clear. The aim
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Biases
The main bias noted in the research investigation was the selection of the respondents, which had limitations and restrictions on age, sex, and previous colonoscopy results. Essentially, such considerations ended up biasing the research investigation.
Confounding
The study had a higher possibility of a residual confounding bias because the measure of association between the use of previous colonoscopy results was bound to be mixed up other factors under investigation that could not give an opportunity for getting the most accurate results. In this study, the conclusions indicated that risk reduction of colorectal cancer was observed for both the right-sided and left-sided colon cancer.
Methods
Study Design, Sample, and Population. The study employed a case-control and population-based design that was carried out in the Rhine-Neckar region in the southwestern part of Germany that has a population of more than two million individuals. Initially, the study required eligible patients aged 30 years or older, had experienced their first diagnosis of invasive primary colorectal cancer, were able to communicate in German, and were mentally and physically capable to participate in the study. The report of the study was based on an enormous number of control patients (n _ 1945) and case patients (n _ 2399) who were recruited from January 2003 to December 2007. Furthermore, a total of 22
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