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Colon cancer occurs at the bottom of the digestive system
Two Brazilian studies have shown that intestinal bacteria increase the risk of colorectal cancer.
The researchers observed higher rates of about 30 different bacteria in patients with the disease, compared to healthy individuals.
The latest study showed that some bacteria are usually found in the mouth, while other nutrients in red meat and poultry are converted to carcinogens.
The research team, led by the University of Sao Paulo in Brazil, said it hoped to identify new methods of screening and diagnosing cancer, based on recent findings.
Cancer of the colon or rectum occurs in the lower part of the digestive system. It usually begins with the growth of appendages called "benign tumors", located deeper in the lining of the intestine and which become cancerous for several years.
An earlier study published in 2017 showed that cases of colorectal cancer diagnosed in adults under 55 had doubled between 1990 and 2013, although the cause is unknown.
In response, the American Cancer Society has updated the guidelines for colorectal cancer screening and reduced the age of regular exams from 50 to 45 years.
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