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In a recent study we compared oestrogen receptor (ER) status in invasive mammary carcinomas assessed on core biopsy and surgical specimens with immunohistochemistry using a cut-off of H score of 10.1 The agreement was 98.8% in patients with less than 60 days between the two procedures, and 93% for patients with more than 60 days between the procedures. A potential concern is false-negative assessment on core biopsy (ER negative on core biopsy and ER positive on the surgical specimen). This occurred in 2 of …
Competing interests: None.