Table 1. Demographics, clinicopathological features, and imaging findings of the DCIS-only group and the upgraded DCIS with the invasive component group after mastectomy.

DCIS = ductal carcinoma in situ; IC = invasive carcinoma

	Total cases, 143 (100%)	Pure DCIS group, 108 (75.5%)	Upgraded to IC group, 35 (24.4%)	P-value
Age category (years)				0.752
≤50	46 (32.1%)	36 (33.3%)	10 (28.6%)
>50	97 (67.8)	72 (66.7%)	25 (71.4%)
Ultrasound findings				0.330
Calcification	16 (11.1%)	11 (10.2%)	5 (14.3%)
Cysts/BBC	14 (9.7%)	12 (11.1%)	2 (5.71%)
Mass lesion	47 (32.8 %)	32 (29.6%)	15 (42.9%)
Normal	42 (29.3%)	31 (28.7%)	11 (31.4%)
Not done	19 (13.2%)	17 (15.7%)	2 (5.71%)
Prominent ductal pattern	5 (3.4%)	5 (4.63%)	0 (0.00%)
Size on the mammogram (mm)				0.398
≤20	18 (13.9%)	15 (15.8%)	3 (8.82%)
>20	111 (86%)	80 (84.2%)	31 (91.2%)
Mammogram finding				0.024
Asymmetric density	13 (9%)	8 (7.41%)	5 (14.3%)
Microcalcification	121 (84.6%)	93 (86.1%)	28 (80.0%)
Mass lesion	2 (1.3%)	0 (0.00%)	2 (5.71%)
Normal	7 (4.8%)	7 (6.48%)	0 (0.00%)
Multifocal				0.027
No	121 (84.6%)	96 (88.9%)	25 (71.4%)
Yes	22 (15.3%)	12 (11.1%)	10 (28.6%)
Presentation				0.609
Incidental (symmetrizing breast reduction)	2 (1.3%)	2 (1.85%)	0 (0.00%)
Screening	90 (62.9%)	70 (64.8%)	20 (57.1%)
Symptomatic	51 (35.6%)	36 (33.3%)	15 (42.9%)
Nuclear grade				0.467
Low-intermediate	33 (23%)	27 (25.0%)	6 (17.1%)
High	110 (76.9%)	81 (75.0%)	29 (82.9%)
Comedonecrosis				0.144
No	98 (68.5%)	78 (72.2%)	20 (57.1%)
Yes	45 (31.4%)	30 (27.8%)	15 (42.9%)