Dear Veronique, The term phyllodes tumor includes a group of lesions of varying malignant potential ranging from completely benign (non-cancerous) to fully malignant (cancerous) sarcomas.
Approximately 20% of phyllodes tumors will recur locally if removed with no margin or a margin of a few millimeters of normal breast tissue, regardless of whether they are benign or malignant. A wide excision with a 2cm margin of normal breast tissue is appropriate therapy for benign and borderline phyllodes tumors unless they are so large that this is not cosmetically feasible.