My doctor doesn't seem to think there is anything wrong with it. I don't think that SCC is estrogen based like breast cancer. My doctor hasn't once said that I should quit taking mine.

SCC Right Lateral Tongue T2N0M0 Dx 01/12/06, Surgery 01/25/06. Partial Glossectomy, Bilateral Neck Dissection - 22 lymph nodes - all clear. No radiation.