<prompt> Estrogen positive breast cancer is best treated by which drug?TamoxifenClomifeneGlutethemide5-FU  <response>: Ans. is a i.e., Tamoxifen Drugs commonly used in hormone estrogen receptor positive breast cancer SERMs Tamoxifen, tromifene SERDs Fulvestrant o Aromatase inhibitors :- Letrozole, anastrazole, exemestone. 