Table 4.

Probability of first recurrence during 5-year intervals after diagnosis, conditional on no recurrence of any type in previous intervals, among 1,051 DCIS cases treated with breast conserving surgery from the Vermont Breast Cancer Surveillance System.

	BCS alone (N=327)	BCS + RT (N=318)	BCS + RT and ET (N=276)	BCS + ET (N=130)
Any event
0–5 years	0.143	0.076	0.029	0.058
6–10 years	0.129	0.086	0.052	0.045
11–15 years	0.071	0.121	0.116	0.066
Ipsilateral Invasive
0–5 years	0.060	0.026	0.018	0.042
6–10 years	0.077	0.032	0.023	0.017
11–15 years	0.032	0.038	0.005	0.036
Ipsilateral DCIS
0–5 years	0.059	0.016	0.007	0.016
6–10 years	0.022	0.020	0.001	0.014
11–15 years	0.013	0.013	0.056	0.003
Any contralateral
0–5 years	0.024	0.034	0.004	0.000
6–10 years	0.030	0.034	0.028	0.014
11–15 years	0.026	0.070	0.055	0.027

Abbreviations: BCS, breast conserving surgery; DCIS, ductal carcinoma in sit; ET, endocrine therapy; RT, radiation therapy.