- Should I have any checkups with my GP after my breast cancer treatment? My breast cancer was diagnosed 2 and half years ago. I had a lumpectomy followed by 5 sessions of radiotherapy. I took letrozole for 18 months but it really affected my mobility so I'm now taking tamoxifen which is much better. I have a mammogram each year and I had a bone scan 2 years ago. I read that mammograms are not always reliable if you have dense breast tissue so I do sometimes worry about that. My lump wasn't one you could feel. I just wonder whether I should be having any other checks to make sure the medication isn't doing any harm