No Excess Mortality in Patients Aged 50 Years and Older Who Received Treatment for Ductal Carcinoma In Situ of the Breast

Table 2

(a) Surgical treatment for DCIS over time in the Netherlands. (b) Adjuvant radiotherapy, over time, for patients with DCIS undergoing breast conserving surgery (BCS) or mastectomy

Age		1997–1999	2000–2002	2003–2005	𝑃 value (years)
Distribution of type of surgery over time (%)
<50	BCS	38.9	46.3	43.6	0.4
	MAST	60.5	53.1	55.7
	No surgery	0.6	0.6	0.7
50–64	BCS	50.6	56.4	60.7	<0.001
	MAST	48.6	43.4	38.2
	No surgery	0.8	0.2	1.1
65–74	BCS	50.3	52.6	62.6	<0.001
	MAST	48.8	46.2	36.8
	No surgery	0.9	1.2	0.6
≥75	BCS	37.1	43.4	44.8	0.07
	MAST	55.6	50.9	45.3
	No surgery	7.3	5.7	9.9

(b)

Age	1997–1999	2000–2002	2003–2005	𝑃 value (years)
Breast-conserving surgery (radiotherapy %)
<50	52.3	59.0	71.7	<0.001
50–64	46.4	69.3	81.6	<0.001
65–75	41.9	60.0	82.4	<0.001
>75	26.3	36.4	51.9	<0.001
Mastectomy (radiotherapy %)
<50	2.0	2.3	5.6	0.004
50–64	1.8	3.0	1.9	0.8
65–75	1.4	4.1	1.2	0.6
>75	0	1.7	1.9	0.2