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Why is tamoxifen recommended for LCIS?

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Question from Nunz: Why is tamoxifen recommended for women with LCIS if we aren't sure it's estrogen-receptor-positive?
Answers - Lynn Hartmann In the large U.S. prevention trial on non-invasive disease women with lobular carcinoma in situ (LCIS) were eligible. There was a significant reduction of their risk of subsequent breast cancer with tamoxifen. So we consider tamoxifen a valid option for women with LCIS.
Beth Baughman DuPree, M.D., F.A.C.S. LCIS is not cancer; it is a marker for an elevated risk of developing breast cancer. Therefore, the rationale for using tamoxifen is for those cancers that are estrogen-receptor-positive, we are attempting to block those cells from dividing and turning into cancer. Tamoxifen would not be effective in tumors that are estrogen-receptor-negative, but a majority of breast cancers are estrogen-receptor-positive. Therefore, we derive the benefit of tamoxifen from that fact.

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