2013) and conferred shorter relapse-free survival in different malignancies (Bartholomae et al. Feb. 2016). Several studies indicate that ABCC11 gene, encoding multidrug-resistant protein-8, is expressed significantly more in breast cancer (including TNBC) (Yamada et al. Feb. 2013; Xu et al. 2017) and is associated with poor prognosis (Tsyganov et al. 2022; Nedeljković and Damjanović 2019). It has been shown that ABCC11 confers resistance to anthracyclines, taxanes, mitoxantrone, and methotrexate (Sissung et al. Feb. 2010). Here, ABCC11 is linked to breast cancer.