I am a post-menopausal working woman. I just had a sterotactic biopsy which found no cancer cells but did find hyperplasic cells in the left breast. Also micro-calcifications. Now my doctor wants me to see a surgeon, and an oncologist, they are mentioning another (more invasive)biopsy and tamoxifin for 5 years. I don't understand why they want to do all this when no cancer cells were present. Is it just CYA? Or should I panic?