Q: Does a DCIS diagnosis mean I have breast cancer? What should I prepare myself for in terms of treatment and prognosis?A couple of years ago, my mom, at the age of 80, insisted on undergoing “one last mammogram.” Technically, she was beyond the age range in which they’re recommended — 40 to 74 — but she had just moved to Miami and started seeing a new doctor, so she wanted a clean bill of health as she started her new life. The mammogram detected a suspicious area, though, and a biopsy revealed ductal carcinoma in situ (DCIS).