Table 5.

Rates of contralateral breast cancer in women younger than 50 years and with early-stage (I, II) disease^*

	% with estrogen receptor–positive status	% with estrogen receptor–negative status	P †
No CPM	0.46	0.90	<.001
CPM	0.13	0.16	.90
P	.07	.05

^*CPM = contralateral prophylactic mastectomy.

^†Two-sided P value for two-sample proportion t test.