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Anon - There are many types of cancers and they grow at different rates. When a cancer is termed "aggressive" it means fast-growing. The number 3 most likely is referring to the stage of the cancer, but you should double check that. The following link will provide you with more definitive information on staging. http://www.cancer.org/cancer/breastcancer/detailedguide/breast-cancer-staging
Hope that helps make things clearer for you!