Tamoxifen for estrogen negative metastatic breast cancer

Siegelinde

Does anyone have any insight or knowledge about using Tamoxifen for estrogen negative Stage IV breast cancer? My primary was estrogen negative, mildly (30%) progesterone positive and HER2 positive. The oncologist recommended it after I responded well (as determined by PET scans) to six cycles of Taxotere in combination with Herceptin, Perjeta and Xgeva. I am currently still receiving HP and Xgeva. My mets were bony, no nodal involvement. I have been dragging my feet about beginning Tamoxifen as there seems to be a lot of conflicting information of its efficacy in estrogen negative tumors, and I have fears of the side effects.