Analysis of cross-resistance of the selective estrogen receptor modulators arzoxifene (LY 353 381) and LY 117 018 in tamoxifen-stimulated breast cancer xenografts. - MacGregor-Schafer,J.; Lee,E.-S.; Dardes,R.; Bentrem,D.; O'Regan,R.M.; De los Reyes,A. (Clin Cancer Res, 2001)