For years, we've been treating breast cancer as a single disease. But a new study has reclassified it into ten separate sub-diseases, all with different genetic features—which could transform the way women are diagnosed and treated.

The research, conducted at the University of British Columbia and published in Nature, analyzed the DNA and RNA of 2,000 tumor samples taken from women diagnosed with breast cancer. That huge pool of data allowed them to spot new patterns— eventually discovering that there are ten subtly different cancers that are all currently lumped together as one.