HSP90AA1 and breast cancer: Finally, we compared four distinct human breast cancer or normal control cell lines, MDA-MB-231 (Hsp90α secretion+ and LRP1+), HBL-100 (Hsp90α secretion− and LRP1+), HS-578T (Hsp90α secretion− and LRP1+) and T47D (Hsp90α secretion+ and LRP1+).