Biologic age, a DNA-based estimate of a person's age, is associated with future development of breast cancer, according to researchers.

Biologic age was determined by measuring DNA methylation, a chemical modification to DNA that is part of the normal ageing process.

The study showed for every five years a woman's biologic age was older than her chronologic or actual age, known as age acceleration, she had a 15 percent increase in her chance of developing breast cancer.

The results from this study have been published in the Journal of the National Cancer Institute.

Scientists speculate that biologic age may be tied to environmental exposures.

If so, it may be a useful indicator of disease risk.

They used three different measures, called epigenetic clocks, to estimate biologic age.

These clocks measure methylation found at specific locations in DNA.

Researchers use these clocks to estimate biologic age, which can then be compared to chronologic age.

The researchers used DNA from blood samples provided by women enrolled in the NIEHS-led Sister Study, a group of more than 50,000 women in the U.S. and Puerto Rico.

The study was specifically designed to identify environmental and genetic risk factors for breast cancer.

The research team measured methylation in a subset of 2,764 women, all of whom were cancer-free at the time of blood collection.

"We found that if your biologic age is older than your chronologic age, your breast cancer risk is increased. The converse was also true. If your biologic age is younger than your chronologic age, you may have decreased risk of developing breast cancer," said corresponding author Jack Taylor, M.D., Ph.D., head of the NIEHS Molecular and Genetic Epidemiology Group. "However, we don't yet know how exposures and lifestyle factors may affect biologic age or whether this process can be reversed."

Lead author Jacob Kresovich, Ph.D., a postdoctoral fellow in the Taylor group, had read studies that used epigenetic clocks to predict age-related mortality.

Since age is the leading risk factor for breast cancer, he hypothesised that age acceleration may be associated with higher breast cancer risk.

"If you look at a group of people who are all the same age, some may be perfectly healthy while others are not," Kresovich said. "That variability in health may be better captured by biologic age than chronologic age."

Kresovich suggests that using DNA methylation to measure biologic age may help scientists better understand who is at risk for developing cancer and other age-related diseases.

This research is an example of epigenetics - a field that studies how biochemical processes turn individual genes on or off, without affecting the DNA sequence.

The Taylor group plans to continue using epigenetic data, along with information on genetics, environment, and lifestyle to better understand how these factors interact and contribute to disease risks.

Source: National Institute of Environmental Health Sciences

Photo credit: NIEHS