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Home / Health News / Bacterium causing stomach cancer may play role in colorectal cancer

Bacterium causing stomach cancer may play role in colorectal cancer

Turns out, a bacterium known for causing stomach cancer might also increase the risk of certain colorectal cancers, according to a study led by Duke Cancer Institute researchers.

By: ANI   | | Updated: October 11, 2018 8:47 am
Tags: Antibodies  Bacteria  Colorectal adenomas  Helicobacter pylori  
Colorectal-cancer

Turns out, a bacterium known for causing stomach cancer might also increase the risk of certain colorectal cancers, according to a study led by Duke Cancer Institute researchers. The finding was published in the Journal of Gastroenterology, and describes an association between antibodies to H. pylori bacteria and an increased risk of colorectal cancers, although it does not establish the bacteria as a definitive cause. Also Read - Now, we have a testing platform that can detect Covid-19 antibodies within seconds

In an analysis of more than 4,000 colorectal cancer cases culled from large, diverse cohort studies, the researchers found a significant correlation between colorectal cancer incidence and those who had been infected with a virulent strain of H. Pylori. Also Read - New COVID-19 mutations may escape antibodies and cause reinfection; Here’s what you need to know



“The link between infection and cancer is intriguing, particularly if we can eradicate it with a simple round of antibiotics,” said lead author Meira Epplein, Ph.D., co-leader of Cancer Control and Population Sciences at Duke Cancer Institute. Also Read - Antibodies target different part of coronavirus in severe COVID-19 cases: Study

Epplein and colleagues collected data from 10 large regional and national studies, including the Southern Community Cohort Study, the Nurses Health Study, the Women’s Health Initiative and the American Cancer Society’s Cancer Prevention Study-II, among others.

They analyzed blood samples from more than 8,400 ethnically and regionally diverse study participants — half who went on to develop colorectal cancer and the other half with no such diagnosis.

The researchers found that H. pylori infections were equally common in both cancer and non-cancer group, with 4 in 10 patients in both groups testing positive for exposure to the bacterium.

But stark racial differences also appeared. White patients had below average H. pylori infection rates, and Asian Americans had average rates. For black and Latino patients, however, the rates were much higher. Among African Americans, 65 per cent of the non-cancer patients and 71 per cent of the colorectal cancer patients had H. pylori antibodies; among Latinos, 77 per cent of the non-cancer group and 74 per cent of the cancer group had antibodies.

Further analysis showed that antibodies to four H. pylori proteins were most often present among the different ethnic groups with colorectal cancer. One H. pylori protein, in particular, VacA, had the strongest association with increased odds of colorectal cancer among the African American patients in the study, and, specifically, high levels of antibodies to this protein were associated with colorectal cancer incidence in both African Americans and Asian Americans.

Epplein said additional studies might also determine whether antibodies to the H. pylori VacA protein could serve as a marker of colorectal cancer risk if it isn’t causing cancer directly. (ANI)

Published : October 11, 2018 8:46 am | Updated:October 11, 2018 8:47 am
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