Breast cancer is not just a single illness, but an umbrella of 10 genetically different diseases.
According to BBC news in a new study, researchers were able to split the cancer into ten unique categories.
They did this after examining samples from about 2,000 tumors.
The study could help doctors find new and better ways of treating breast cancer by targeting specific forms of it.
Researchers say their findings could influence treatment in the future.
But that could happen in as little as three years.