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Fig. 2 | BMC Cancer

Fig. 2

From: External quality assessment (EQA) program for the immunohistochemical detection of ER, PR and Ki-67 in breast cancer: results of an interlaboratory reproducibility ring study in China

Fig. 2

Optimal staining for ER, PR and Ki-67 that was deemed to be the reference value. a ER-1: 11–50% positive staining (× 100). b ER-2: > 50% positive staining (× 100). c ER-3: negative staining (× 100). d PR-1: > 50% positive staining (× 100). e PR-2: 1–10% positive staining (× 100). f PR-3: negative staining. g-h KI-1and KI-2: > 30% positive staining in breast cell lines (MCF-7 and MDA-MB-231, × 100). i-k Ki-67 staining in breast carcinoma tissue. i KI-3: 10–30% positive staining (× 100). j KI-4: < 10% positive staining (× 100). k KI-4: > 30% positive staining (× 100). ER: estrogen receptor, PR: progesterone receptor

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BMC Cancer

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