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Frequency (A) and intensity (B) of high ABC transporter expression classified by subtype, including luminal A (open columns), luminal B (hatched columns), HER2-enriched (gray columns), five-negative (dotted columns), and core-basal (filled columns). (A) Percentage of patients who showed high expression of each transporter. (B) Semi-quantification of expression level of each transporter, using a 4-point scoring system.
