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Table 1 Demography and tumor characteristics

From: Skin invasion and prognosis in node negative breast cancer: a retrospective study

   Case Control  
Gender Female 96 (99.0%) 4485 (99.7%) p = 0.290
  Male 1 (1.0%) 15 (0.3%)  
Age Mean 58.8   52.8   p < 0.001
  Range 30–86   23–91   
Tumor size (cm) Median 3   2.2   p < 0.001
  Range 0.8–13.0   0–20   
Nodal status Node Negative 97 (100%) 4500 (100%)  
  Node Positive 0 (0%) 0 (0%)  
Histological subtype Invasive ductal 77 (79.4%) 3941 (87.6%) p = 0.002
  Invasive lobular 12 (12.4%) 194 (4.3%)  
  Mucinous 5 (5.2%) 216 (4.8%)  
  Other 3 (3.1%) 145 (3.3%)  
Estrogen receptor Positive 49 (50.5%) 1608 (35.7%) p < 0.001
Status Negative 30 (30.9%) 1132 (25.2%)  
  Unknown 18 (18.6%) 1760 (39.1%)