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Table 1 Characteristics of DCIS molecular subgroups, by immunohistochemistry in 392 women with a primary DCIS

From: Long-term survival of women with basal-like ductal carcinoma in situ of the breast: a population-based cohort study

Characteristics Basal-like (n = 32, 8.2%) Non basal-like (n = 360, 91.8%) P
Age at entry, mean ± SD (n = 392) 56.7 ± 12.6 57.8 ± 11.5 0.6
Tumor size, number (%) (n = 352)    0.84
   ≤ 15 m 16 (59.3) 175 (53.9)  
   > 15 mm 8 (29.6) 104 (32.0)  
   Multifocal 3 (11.1) 46 (14.2)  
Tumor grade*, number (%) (n = 388)    0.11
   I 1 (3.1) 29 (8.2)  
   II 11 (34.4) 171 (48.0)  
   III 20 (62.5) 156 (43.8)  
Detection mode, number (%) (n = 391)    0.3
   Screening 22 (68.8) 276 (76.9)  
   Clinically 10 (31.3) 83 (23.1)  
Type of surgery, number (%) (n = 392)    0.61
   Breast Conserving Surgery 26 (81.3) 272 (75.6)  
   Mastectomy 6 (18.8) 88 (24.4)  
Postoperative radiotherapy, number (%)(n = 392)    0.72
   Yes 10 (31.3) 130 (36.1)  
   No 22 (68.8) 230 (63.9)  
  1. * Tumor grade: DCIS were classified according to the European Organization for Research and Treatment of Cancer (EORTC) system.