Patients with stage IV/locally recurrent TNBC who had received no more than two previous chemotherapy regimens for mTNBC were randomly allocated to gemcitabine 1,000 mg/m ( 2 ) and carboplatin area under the curve 2 ( days 1 and 8 ) alone or GC plus iniparib 5.6 mg/kg ( days 1 , 4 , 8 , and 11 ) every 3 weeks .