Figure 2 | Modern Pathology

Figure 2

From: Semi-quantitative immunohistochemical assay versus oncotype DX® qRT-PCR assay for estrogen and progesterone receptors: an independent quality assurance study

Figure 2

This case of invasive carcinoma was interpreted as PR positive by oncotype qRT-PCR assay (expression units of 6.7) but remained negative by immunohistochemistry even on repeat testing. Note that the ductal carcinoma in situ (a) is positive for PR (b). The intermixed normal duct (c) also shows unequivocal reactivity for PR (d).

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