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In 2018, olaparib, a PARP inhibitor, was approved for the treatment of BRCA1/2 gene-mutation positive and HER2-negative inoperable and recurrent breast cancer; BRCA1/2 gene testing was also listed as a companion diagnostics. Here, we identified microRNAs(miRNAs) expressed after treatment with olaparib, which differed in the presence or absence of BRCA1 mutations in triple negative breast cancer(TNBC), and examined the changes in miRNAs after exposure to the combination of the PARP-1 inhibitor and a chemotherapeutic agent. After exposure