A new study suggests women are being over-diagnosed with breast cancer.  

Researchers looked at 30 years of data and found that as many as a third of cancers detected through mammograms may not be life-threatening.  

The paper was published in the New England Journal of Medicine last week, and it's just the latest research that raises questions about the value of mammograms.   

Dr. John MacGregor, a specialist in diagnostic radiology in Calgary, spoke to the Calgary Eyeopener’s David Gray on the value of mammograms.

Click on the audio above to hear the full interview.