Cervical & Breast..relationship?!?

My mother recently went to the doctor for a check up and the doctor found the "small" lump she has been hiding in her breast. It turns out it is a large lump and now tomorrow she is having to go for a mammogram and a biopsy to find out if it is cancerous. The doctor told her that there is an 80% chance that it is. My mother is not even 40 yet (July 4) and she's already gone through having cervical cancer in September of 1998. In '98 they found her cancer because she was pregnant with my little sister. She had a hysterectomy and thought everything was over. Now almost ten years later they find a lump and say that they believe it is related to the cervical cancer that she had. Can it be? Is this lump a form of breast cancer that is associated with cervical cancer?