This is a study to assess the safety of the combination of mifepristone and eribulin in patients with metastatic or locally advanced unresectable breast or other specified solid tumors, and determine preliminary efficacy of the combination of mifepristone and eribulin in patients with metastatic or locally advanced unresectable Triple Negative Breast Cancer (TNBC). The structure for the study is a single arm, non-randomized, open-label, multicenter trial with no control group. The study will be conducted at up to 11 sites, with up to 40 evaluable patients