Breast cancer is the most common cancer in women in the world. The role of germline genetic variability in ATP-binding cassette (ABC) transporters in cancer chemoresistance and prognosis still needs to be elucidated. We used next-generation sequencing to assess associations of germline variants in coding and regulatory sequences of all human ABC genes with response of the patients to the neoadjuvant cytotoxic chemotherapy and disease-free survival (n = 105). A total of 43 prioritized variants associating with response or survival in the above testing phase were then analyzed by allelic discrimination in the large validation set (n = 802). Variants in ABCA4, ABCA9, ABCA12, ABCB5, ABCC5, ABCC8, ABCC11, and ABCD4 associated with response and variants in ABCA7, ABCA13, ABCC4, and ABCG8 with survival of the patients. No association passed a false discovery rate test, however, the rs17822931 (Gly180Arg) in ABCC11, associating with response, and the synonymous rs17548783 in ABCA13 (survival) have a strong support in the literature and are, thus, interesting for further research. Although replicated associations have not reached robust statistical significance, the role of ABC transporters in breast cancer should not be ruled out. Future research and careful validation of findings will be essential for assessment of genetic variation which was not in the focus of this study, e.g., non-coding sequences, copy numbers, and structural variations together with somatic mutations.

Biomedical Center Faculty of Medicine in Pilsen Charles University 323 00 Pilsen Czech Republic

Department of Oncology 2nd Faculty of Medicine Charles University and Motol University Hospital 150 06 Prague Czech Republic

Department of Oncology Medical School and Teaching Hospital Palacky University 779 00 Olomouc Czech Republic

Department of Oncosurgery Medicon Services 140 00 Prague Czech Republic

Department of Surgery EUC Hospital and University of Tomas Bata in Zlin 760 01 Zlin Czech Republic

Toxicogenomics Unit National Institute of Public Health 100 42 Prague Czech Republic

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