Table 1.

Mean percentage of tumor stromal cells positive for immunohistochemistry marker.

	Fibroadenoma (A)	Low-grade phyllodes tumor (B)	High-grade phyllodes tumor (C)	p-value A vs. B	p-value A vs. C	p-value B vs. C
Ki-67	2.5%	7.7%	45.0%	<0.001	<0.001	<0.001
p53	2.7%	10.0%	30.5%	<0.001	<0.001	0.01
β-catenin	38.2%	48.8%	9.5%	0.099	<0.001	<0.001
E-cadherin	0	0	0	1	1	1