question: my wife was diagonised with breasr cancer 2 stage and she underwent 6 chemo ,surgery for removal of breast and 25 radiation ,er was positive,aince 2 years she was taking tomoxofin and recently when she had a eye check up there were 3 spots on her retina and after her consulation with her oncolist he has changed tomoxofin toi ANABREZ.is it the right drug for her