mastectomy versus lumpectomy for HER2

[Kaa1102]

My sister has a .6 mm HER2 positive invasive ductal tumor and insitu in addition close to it as well as some calcifications that appear to be scattered about her left breast. Mammogram and MRI of right breast are clear. She is 49. She wants a lumpectomy. She is only considering a mastectomy because an MRI came back with possible additional insitu. She thinks a mastectomy and reconstruction are horrible. How do I help her decide? She expresses negativity in regards to reconstruction. How do I help her decide whether to do reconstruction or just scrap it and just have mastectomy? She expresses concern regarding silicone, expresses concern with the recovery, expresses concern with being vain when cancer should be the main concern, expresses worry that reconstruction will delay treatment? Can any of you shed some light on these concerns.