what can we do after tamoxifen?

My mother is sufferring breast  cancer, she had an operation in 1997 and  after chemotheraphy she  started  taking tamoxifen.Now her estrogen results are vey high, doctors  say it is very  dangerous, she didnt take  hysterectomy operation. After  tamoxifen what can we do? Tamoxifen reduces uterine  cancer risk. We are living in Turkey,in capital  city Ankara. That's why i wonder if they make a diffrent treatment somewhere on earth, if there is another  posible drug exists which has less risk of cousing another cancer to body. if you may reply me, i would be  very appreciated.
Sincerely,
Asli

[CCF-RN,MSN-rf]

Dear rona:  I am unclear from your message.  Is the estrogen high while she

[isabel68]

I am not a Doctor, but you may want to ask your mother's oncologist about Femara, this is a drug recommended for women that failed on Tamoxifen.  Removal of the ovaries, which is the main source of estrogen is another option.  I also wanted to add that Tamoxifen increases uterine cancer risk.
Take care and my best wishes to your mother