Phyllodes Tumor - Benign

ps1968

My doctor found a lump at a yearly exam on 1/18/10.  Within one month, I have had a mammogram, ultrasound, biopsy, a lumpectomy on 2/12 and then another surgery today to remove more breast tissue.  My diagnosis is a  phyllodes tumor.  The tumor was sent to a specialist out of state who specializes in phyllodes tumors.  He determined that not enough tissue was taken on 2/12 so I had the second surgery today to be sure.  I am confused by what little information there is about these tumors.  Some websites show that all phyllodes tumors are considered breast cancer (even benign ones) because they have a high probability to become malignant.  I would appreciate any information I could get to learn more about the tumors and whether they truly are all considered breast cancer or not.  Thank you for your help.