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Typical images of immunihistochemistry (IHC) staining for aldehyde dehydrogenase (ALDH) 1A3 expression in invasive breast carcinoma (IHC stain for ALDH 1A3, ×400). (A) Absence of ALDH 1A3 expression in tumor (score=0). (B) Few ALDH 1A3 tumor cells with moderate staining intensity (score=1+2; P+I). (C) Abundant of ALDH 1A3 tumor cells with moderate staining intensity (score=2+4; P+I). (D) Abundant of ALDH 1A3 tumor cells with strong staining intensity (score=3+5; P+I).
