Surgical Treatment Close/dirty margin, primary mastectomy Close/dirty margin, breast conservation P value chi square test Complete mastectomy Mastectomy total
Extensive disease          
Unifocal invasive cancer without multifocal or diffuse insitucomponent 0% (0/11) 14.3% (1/7) p=0.8331 1 66.7% (12/18)
Unifocal invasive cancer with multifocal or diffuse insitucomponent 10.5% (2/19) 43.7% (38/87) p=0.0154 12 29.2% (31/106)
Multifocal invasive cancer, any insitucomponent 17.1% (6/35) 47.8% (22/46) p=0.0076 16 63% (51/81)
Diffuse invasive cancer, any insitucomponent 8.3% (1/12) 28.6% (2/7) p=0.5758 1 68.4% (13/19)
Total 11.7% (9/76) 42.5% (63/148) p <0.0001 30 47.8% (107/224)
Non-extensive disease          
Unifocal invasive cancer without multifocal or diffuse insitucomponent 1.4% (1/74) 3.6% (12/337) p=0.3537 5 19.2% (79/411)
Unifocal invasive cancer with multifocal or diffuse insitucomponent 0% (0/11) 14.8% (8/54) p=0.3831 4 23.1% (15/65)
Multifocal invasive cancer, any insitucomponent 9.1% (1/11) 16.7% (9/54) p=0.8333 4 23.1% (15/65)
Diffuse invasive cancer, any insitucomponent 0% (0/3) 0% (0/5) - 0 37.5% (3/8)
Total 2% (2/99) 6.4% (29/450) p=0.1728 13 20.4% (112/549)
Table 2: Proportion of breast cancer cases with close/dirty margins by lesion distribution, disease extent, and type of surgery.