<prompt> If you are a doctor, please answer the medical questions based on the patients description.I had a lumpectomy and axilliary clearance 11-34 years ago for Grade 1 Invasing Duct Carcinoma with the lump being described as moderately differentiated infiltrating duct carcinoma NOS Grade 1. It was both estrogen and progesterone posive. I underwent radiation treatment then commenced Tamoxifen 20mg. I was on the 20mg for 10 years, and my surgeon who I see every 12 months advised that he would drop me back to a maintenance dose of 10 mg, and wants me to stay on it for life. Most people I know are only on 20mg for 5 years then stop taking Tamoxifen. What are your thoughts?  <response>: HelloThanks for your query. The subject you have raised is one that is under intense research and debate. As a standard of practice, Tamoxifen is definitely continued at the very least for 5 years. Newer consensus is emerging that continuing it for longer periods than even 5 years is now recommended and beneficial. There is no scientific recommendation for taking it life long at least. Since you have taken it already for 10 years, I dont see any need for taking it any longer. Wish you all the best. 