Table 2.

The relation between microinvasion and clinicopathological and treatment parameters.

	DCIS with microinvasion		DCIS without microinvasion		Total	P value
DCIS grade	521	4.6%	10,764	95.4%	11,285
Low	7	0.7%	988	99.3%	995
Intermediate	91	2.9%	3002	97.1%	3093
High	421	5.9%	6761	94.1%	7182
Unknown	2	13.3%	13	86.7%	15	<0.001
Size of DCIS	521	4.6%	10,764	95.4%	11,285
<10 mm	64	2.2%	2809	97.8%	2873
10–20 mm	124	3.9%	3053	96.1%	3177
20–30 mm	115	5.8%	1863	94.2%	1978
30–40 mm	55	5.2%	1011	94.8%	1066
>40 mm	158	8.0%	1829	92.0%	1987
No residual DCIS*	0	0.0%	93	100.0%	93
Unknown	5	4.5%	106	95.5%	111	<0.001
Treatment	521	4.6%	10,764	95.4%	11,285
BCS only	44	1.5%	2908	98.5%	2952
BCS + RT	230	5.0%	4325	95.0%	4555
BCS (unknown RT)	14	3.6%	378	96.4%	392
Mx	232	6.9%	3140	93.1%	3372
No surgery	1	7.1%	13	92.9%	14	<0.001
RT (BCS only)	230	5.0%	4325	95.0%	4555
No RT (BCS only)	44	1.5%	2908	98.5%	2952	<0.001
BCS, margin width	288	3.6%	7611	96.4%	7899
<2 mm	52	4.8%	1025	95.2%	1077
2 mm or more	217	3.4%	6153	96.6%	6370
Unknown	19	4.2%	433	95.8%	452	0.06
Axillary nodes examined	521	4.6%	10,764	95.4%	11,285
Yes	332	9.8%	3070	90.2%	3402
No	184	2.4%	7587	97.6%	7771
Unknown	5	4.5%	107	95.5%	112	<0.001
Axillary nodes examined (BCS patients only)	288	3.6%	7611	96.4%	7899
Yes	125	18.7%	545	81.3%	670
No	161	2.2%	6999	97.8%	7160
Unknown	2	2.9%	67	97.1%	69	<0.001

*DCIS fully excised on diagnostic biopsy.