What we currently call breast cancer should be thought of as 10 completely separate diseases, according to an international study which has been described as a "landmark".
The categories could improve treatment by tailoring drugs for a patient's exact type of breast cancer and help predict survival more accurately.
"Breast cancer is not one disease, but 10 different diseases," said lead researcher Prof Carlos Caldas.
The study was funded by Cancer Research UK. Its chief executive, Dr Harpal Kumar, said: "This is the largest ever study looking in detail at the genetics of breast tumors.
Source BBC News - Breast cancer rules rewritten in 'landmark' study
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