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A new study showed how genetic variants, which are differences in sequences of genes, can simultaneously affect multiple health conditions.
Diabetes UK, which part-funded the research, said the findings help to highlight how people with type 2 are at increased risk of breast, bowel and pancreatic cancer and could lead to new ways of preventing disease.
The study, which has not yet been peer-reviewed or published in a medical journal, is being presented at the Diabetes UK Professional Conference in London.
Being overweight or obese increases the risk of developing type 2 diabetes, with obese people having around a seven times greater risk of the condition than those of a healthy weight.
But other factors, such as not getting enough exercise and genetics, also play a role.
Hundreds of different genetic variants have already been identified as contributing to type 2, and it is known that genetics can increase the risk of cancer.
However, the genetic factors that contribute to the link between type 2 diabetes and increased cancer risk have been poorly understood until now.
In the new study, led by Professor Inga Prokopenko at the University of Surrey, experts looked at genetics to see if they could help to explain why some people with type 2 diabetes also get cancer.
They focused on the three cancer types that people with type 2 diabetes are at higher risk of developing – post-menopausal breast cancer, colorectal (bowel) cancer and pancreatic cancer.
The team used DNA data from more than 36,000 people from several European countries for the study, including people living with type 2 diabetes and cancer.
The researchers identified, for the first time, that two specific genetic variants are key contributors to people developing both type 2 diabetes and cancer.
One variant was linked to the risk of developing both breast cancer and type 2 diabetes, while the other affected type 2 diabetes and breast, bowel and pancreatic cancer risk.
Therefore, the study concluded, that people carrying either of these genetic variants will have an increased chance of developing both type 2 diabetes and these cancers.
The work further identified 17 variants that directly increase the risk of developing type 2 diabetes, and then, via biological processes linked to type 2 diabetes, indirectly increase cancer risk.
It is thought this is because type 2 diabetes creates an environment that makes it easier for cancer to develop in the body, through higher blood sugar levels, higher insulin levels, obesity, inflammation and hormonal changes.
Dr Elizabeth Robertson, director of research at Diabetes UK, said: “Type 2 diabetes and cancers are complex conditions with a multitude of factors increasing people’s likelihood of developing them.
“This research sheds new light on the role that genetically determined factors play in why some people with type 2 diabetes are also at risk of breast, colorectal and pancreatic cancer.
“In time, this could help doctors to identify people earlier who are at risk of both type 2 diabetes and certain cancers, while paving the way to better, more personalised ways to prevent and treat the conditions.
“It’s important to remember that people who have genes that are linked to type 2 diabetes and cancers can still take steps to reduce their risk of both conditions, by getting support to manage your weight, eating well, keeping active and not smoking.”
Dr Helen Croker, assistant director of research and policy at the World Cancer Research Fund (WCRF), which helped fund the study, said: “WCRF is proud to fund this important research which looks at a population of people that is particularly vulnerable to cancer.
“As cancer is now the leading cause of death among people with diabetes, understanding the complex genetic interplay between type 2 diabetes and several cancer types is crucial for driving prevention strategies for this group of people.”
More than five million people in the UK have diabetes, of which 90% have type 2.
Published: by Radio NewsHub
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