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NEW YORK (Reuters Health) – According to two new studies, scientists have linked some intestinal bacteria to an increased risk of colorectal cancer.
Scientists have found high levels of about 30 different bacteria in patients with the deadly disease, compared to healthy individuals.
Some bacteria have been found in the mouth, while others have been found in red meat and poultry, contributing to the conversion of nutrients into carcinogens.
The research team, led by the University of Sao Paulo in Brazil, hopes the findings will help find new ways to examine, diagnose and treat cancer.
In the two studies published in Nature Medicine, scientists discovered 29 species of bacteria in cancer patients in the United States, Europe, and Asia.
In the first study, researchers examined more than 600 stool samples from patients and found that high levels of bacteria, usually found in saliva, also existed in stool samples of cancer patients.
This includes the mouth bacterium "Fusobacterium nucleatum", which plays a role in the incidence of gum disease and was also linked to colorectal cancer in the past.
"A large number of oral bacteria tend to migrate to the intestine in patients with colorectal cancer, which causes inflammation of the intestines, resulting in the appearance of the tumor," said the Dr. Andrew Maltis Thomas, Researcher. The presence of these bacteria and cancer of the intestine and colon. "
The second study, conducted by the University of Trento in Italy, found that choline (the main nutrient found in many foods) is destroyed by intestinal bacteria and converted into metabolites, which is necessary for metabolism.
In previous studies, this metabolite was associated with an increased risk of cardiovascular disease. The team has now discovered that this increases the risk of colorectal cancer.
Scientists say future studies will determine whether bacteria increase the risk of colorectal cancer or whether cancer plays an important role in the growth of certain bacteria.
Source: Daily Mail
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