Hello and hope you are doing well.
Are there any changes to the size and shape of your breast? If there are no changes and if you have not developed any additional symptoms since 2009, its unlikely to be cancer. But if you develop any symptoms like discharge or pain or an increase in size of the breast or an armpit swelling, you can opt for the biopsy. You can have a follow up mammography done to see for any additional changes.
Hope this helped and do keep us posted.