A study suggests men with low testosterone levels may be at increased risk of developing breast cancer.

A large study published in The Lancet on Friday said men with the highest levels of testosterone in their blood have higher risk of breast cancer, and they have also been found to have higher rates of osteoporosis.

Researchers from the University of British Columbia’s Institute for Social Sciences (ISS) used data from the Canadian Cancer Society and Cancer Care Canada to track and analyse the health of 1,000 men.

Men with low levels of the hormone testosterone were found to be at greater risk of prostate cancer, according to the study.

The study, which looked at data from 590 men aged between 50 and 74, found men with higher levels of hormone had an increased risk for breast cancer compared to men with lower levels of it.

It is the first study to suggest a link between testosterone and breast cancer risk, said Dr. Elizabeth Aylward, the lead author of the study and a physician at the Institute for Health Sciences at the University’s Mowat Centre.

Dr. Aylaway said the study also showed a link in the lung cancer population, which could lead to other possible links, including those in men with asthma and diabetes.

In a statement, Dr. Aynan K. H. said the findings support the findings of a previous study published earlier this year that found men who had higher levels, or levels that peaked at puberty, had a higher risk for prostate cancer.

Aylward said the risk is lower for men with hormone replacement therapy, as testosterone levels typically fall over time.

She said that is the case in the US, where men with testosterone levels between 1.8 and 2.0 nanograms per deciliter were found at increased prostate cancer risk.