Table 4.

Ipsilateral invasive procedures after DCIS excision by year of follow-up^*

Year of follow-up	Total No. of women	0 invasive procedures, %	At least one invasive procedure, No. (%)	1 invasive procedure, %	2–4 invasive procedures, %	Invasive procedures, total (mean per patient)
1 (0–6 mo)	2948	48.5	1518 (51.5)	48.6	2.9	1611 (0.55)
1 (7–12 mo)	2937	95.3	137 (4.7)	4.3	0.4	149 (0.05)
2	2821	95.2	134 (4.8)	4.2	0.6	151 (0.05)
3	2593	95.5	116 (4.5)	4.0	0.4	130 (0.05)
4	2296	96.9	71 (3.1)	2.8	0.3	77 (0.03)
5	1813	97.0	55 (3.0)	2.6	0.4	63 (0.03)
6	1378	97.8	31 (2.2)	2.1	0.1	34 (0.02)
7	1051	96.8	34 (3.2)	2.9	0.3	37 (0.04)
8	879	97.2	25 (2.8)	2.7	0.1	26 (0.03)
9	752	97.9	16 (2.1)	2.0	0.1	17 (0.02)
10	571	98.2	10 (1.8)	1.8	0.0	10 (0.02)

^*N = 2948. Includes fine needle aspiration, needle/core biopsy, excisional biopsy, and mastectomy. DCIS = ductal carcinoma in situ.