MAIT cells express ABCB1 and persist through chemotherapy. (A) Representative Vα7.2-CD161 staining of CD3⁺CD4⁻CD62L⁻CD95⁺ PBLs. (B-C) Representative ABCB1 (B) or Rh123 (C) staining according to Vα7.2-CD161 expression as gated in panel A. (A-C) n = 4. (D) Blood numbers of naive (CD45RA⁺CD27⁺) or memory (CD45RA⁻CD27⁺) CD4 or CD8 T (CD3⁺γδ⁻) and MAIT cells of breast cancer patients before (P1), during (P2), and after (P3) chemotherapy (6 cycles of anthracycline-containing regimen). All values were normalized to prechemotherapy.