Table 1.

Characteristics of cancers according to ER status.

	ER 1-Positive Cancers (n = 23)	ER 1-Negative Cancers (n = 6)	p Value
Age (y)	64.0 ± 13.2	60.7 ± 8.0	0.35
Diameter (mm)	28.5 ± 16.3	27.7 ± 9.8	0.79
Ki-67	23.9 ± 18.6	51.7 ± 23.2	0.01
T1 (msec)	1142 ± 253	1331 ± 201	0.08
T2 (msec)	72.7 ± 15.7	92.1 ± 13.0	0.006
PD 2 (%)	69.3 ± 12.7	74.5 ± 5.8	0.39

Data are presented as mean ± standard deviation. ¹ ER, estrogen receptor; ² PD, proton density.