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Table 3 Distribution of breast tumor characteristics among sporadic breast cancer cases

From: KRAS rs61764370 is associated with HER2-overexpressed and poorly-differentiated breast cancer in hormone replacement therapy users: a case control study

Tumor characteristics   Sporadic breast cancer cases N (%)
Histologic type   
  Ductal 444 (84.9)
  Lobular 62 (11.9)
  Special-type 17 (3.2)
  Missing 7
Tumor size   
  ≤ 20 mm 349 (67.2)
  21-50 mm 152 (29.3)
  > 50 mm 18 (3.5)
  Missing 11
Histopathologic grade   
  1 89 (17.1)
  2 227 (43.6)
  3 205 (39.3)
  Missing 9
Tubular formation   
  1 33 (6.3)
  2 143 (27.5)
  3 344 (66.2)
  Missing 10
Nuclear atypia   
  1 16(3.1)
  2 267(51.3)
  3 237(45.6)
  Missing 10
Mitotic index   
  1 219(42.3)
  2 141(27.2)
  3 158(30.5)
  Missing 12
Vascular invasion   
  No 403(79.3)
  Yes 105(20.7)
  Missing 22
Lymph node involvement   
  No 288(57.5)
  Yes 213(42.5)
  Missing 29
HR status   
  ER-PR- 83(15.7)
  ER + and/or PR+ 444(84.3)
  Missing 3
HER2 status   
  HER2- 449(87.7)
  HER2+ 63(12.3)
  Missing 18