Table 3.

Immunohistochemistry in initial biopsy and surgical specimens

Initial biopsy	Final surgery, n		Prevalence, % (95%CI)		p-value
	positive (≥20%)	negative (<20%)	initial biopsy	final surgery
ER status
Positive	209	11	80.3 (75.1–84.8)	79.6 (74.3–84.2)	0.824
Negative	9	45	19.7 (15.2–24.9)	20.4 (15.6–25.7)
PR status
Positive	149	34	68.0 (62.1–73.6)	61.7 (55.6–67.5)	0.024
Negative	17	69	32.0 (26.4–37.9)	38.3 (32.5–44.4)
HER2 status
Positive	40	9	20.5 (15.6–26.2)	19.7 (14.8–25.3)	0.804
Negative	7	183	79.5 (73.8–84.4)	80.3 (74.7–85.3)
Ki-67
≥20%	112	63	76.4 (70.4–81.8)	55.0 (48.3–61.6)	< 0.001
<20%	14	40	23.6 (18.2–29.6)	45.0 (38.4–51.7)