I am doing a case study for class and it is about a 43-year-old woman who had detected a lump in the upper outer quadrant of her left breast that is a single mobile, painless lump. A biopsy is done that shows probable malignancy. She is scheduled for surgery and there is no evidence of regional lymph node involvement. Her tumor is thought to be responsive to estrogen. What type of breast surgery is indicated? What other treatments is she likely to receive? How often should she have a mammorgraphy done? What implications does her breast cancer have for the use of estrogen therapy when she becomes menopausal?