Most breast cancers in men are ductal carcinomas. Ductal means the cancer started in the milk pipes of the breast, called ducts. These cancers are usually invasive because they start inside the duct and then break through the wall of the duct, growing into the normal surrounding breast tissue.
In 2015, an estimated 25,000 women and 220 men in Canada will be diagnosed with breast cancer. Due to the small number of cases, breast cancer in men is not well understood, stigmatized, and can be misdiagnosed or diagnosed late.