COLORECTAL CANCER IN VIETNAM

Abstract

Species, since ancient, were suffered from cancer; however, only mens inside organs of lung, liver, stomach, and others were at seriously exposed to risk factors and developed cancer. In contrast, animals were also suffered from cancer with a very rare occurrence in inside organs, (National Cancer Institute, 1980; Wells et al., 1938). By these evidences, we focused on examination of modification risk factors that might be existed in local environments at community and household levels. Cancer in human for all sites was gradually increasing in both incidence and fatal cases. Etiology and causality of cancer is almost unclear and its findings sometime are agreement in one study population but not in the other populations, remaining question is that scientists observation was wrong or cancer risk factors are flexible and modification existing in our society? In spite of estimated 80% of cancer cases in general and 98% of colorectal cancer in particular caused by environmental factors (Doll & Peto, 1981), there are unclear that what are they in the defined populations?