Translating Mechanism-based Strategies to Break the Obesityã¢ë†â€™cancer Link a Narrative Review
Breaking the link between obesity, gastrointestinal cancers
September 30, 2018
Previous studies have demonstrated a connexion between obesity and a person's risk of developing colon and other gastrointestinal cancers. Now, scientists are investigating approaches that tin break that relationship.
Dr. Stephen Hursting
Steven Hursting, PhD, professor of nutrition at the UNC Gillings School of Global Public Wellness and at the UNC Nutrition Research Institute in Kannapolis, N.C., has co-authored an extensive review of research establishing the biological links between obesity and various gastrointestinal cancers, and of studies showing how various weight-related interventions may help reverse this connection.
The review was published online Aug. 29 in Nature Reviews Gastroenterology & Hepatology.
Obesity has been linked to 13 different cancers, including several cancers of the gastrointestinal organization, making information technology the "second leading cause of cancer after smoking," co-ordinate to an expert console convened in 2016 by the International Agency for Research on Cancer. That panel included Hursting and lead author Cornelia Ulrich, PhD, director of the Huntsman Cancer Institute's National Cancer Constitute-designated Comprehensive Cancer Center.
"Obesity has emerged as a major risk cistron for several gastrointestinal cancers," said Hursting, who also is a member of the UNC Lineberger Comprehensive Cancer Center. "There are lessons from studies of these cancers that are suggesting possible ways to contrary the outcome of obesity on cancer risk."
Hursting and his collaborators reviewed findings from a number of clinical trials that examined the effects of diet and other interventions on the prevention of gastrointestinal cancers, and the bear on of physical activity, diet and weight loss surgery on bloodshed and other outcomes after a person has been diagnosed.
I study, the Women'southward Health Initiative Dietary Modification trial, investigated the effect of lowering fat intake while increasing consumption of grains, vegetables and fruits in preventing cancer in 48,835 postmenopausal women. The researchers reported the dietary changes did not reduce long-term colorectal cancer risk, but information technology did lead to reduced incidence of pancreatic cancer among overweight or obese women.
They also reviewed studies of bariatric surgery, a surgical weight loss intervention that oftentimes results in rapid torso weight reduction and changes in biological markers of cancer risk in extremely obese individuals. Hursting and his colleagues wrote that the results of observational studies of cancer incidence after bariatric surgery suggest that weight loss surgery is associated with lower incidence of several obesity-linked gastrointestinal cancers, including cancers of the esophagus, pancreas and liver.
"The data is emerging that in the face up of chronic obesity, a rapid, sustained metabolic change as achieved with bariatric surgery seems to contrary many pro-cancer effects of obesity," Hursting said. "A current focus of my laboratory is to understand the mechanisms involved in the anti-cancer effects of bariatric surgery and to place combinations of dietary, practice or pharmacologic interventions that tin mimic the benefits of bariatric surgery without having to become through the surgery."
The authors' review of studies of interventions afterwards a cancer diagnosis revealed that calorie restriction and exercise accept "demonstrated benefits both during and afterward treatment" for patients who have cancers of the gastrointestinal system. While there have been no randomized controlled trials, epidemiological evidence from studies at the population level have shown that physical action among survivors reduces the risk of death from colorectal cancer by virtually one-half.
"Some of the clearest data from both animals and humans regarding the reversibility of the pro-cancer furnishings of obesity come from studies of colon cancer," Hursting said.
Lastly, the researchers examined how weight loss, physical activity, diet exercise and bariatric surgery touch biological mechanisms that are linked to cancer, such every bit inflammation.
"Nosotros've tried to assess the mechanistic pathways that underlie the obesity-gastrointestinal cancer link," Hursting said. "At that place are some well-established mechanisms, including systemic inflammation, adipose tissue changes and signals from obesity-associated growth factors, such equally insulin and insulin-similar growth factors. Within the colon, in that location is a lot of interest in the role of the microbiome as well, and how colonic bacteria may exist interacting with obesity to event the tumor microenvironment."
Other co-authors are Caroline Himbert, a doctoral student, and Andreana Holowatyj, PhD, of the Huntsman Cancer Establish. The researchers were supported by grants from the National Institutes of Health, the National Cancer Establish and the National Man Genome Research Institute.
This article originally was posted on the UNC Lineberger Comprehensive Cancer Center website.
Share
Contact the Gillings School of Global Public Health communications team at sphcomm@listserv.unc.edu.
Source: https://sph.unc.edu/sph-news/breaking-the-link-between-obesity-gastrointestinal-cancers/
0 Response to "Translating Mechanism-based Strategies to Break the Obesityã¢ë†â€™cancer Link a Narrative Review"
Post a Comment