Letrozole
"After a modified radical mastectomy for stage 3 breast cancer, I took letrozole for 5 years and my tumor marker test (CA 15-3) remained low. My oncologist and I decided that without any indication of malignancy I could safely go off the letrozole. After 2 years off it my (CA 15-3) blood test shot up and I was diagnosed with metastatic breast cancer on my chest wall. I resumed taking letrozole and had 36 radiation treatments. I have taken letrozole for 7 months now and my most current CT scan showed the lesion was gone. I know the radiation destroyed most of the lesion but I'm sure the letrozole helped a lot with the rest. I probably will take letrozole for the rest of my life."