Table 1.

Clinical–pathologic characteristics of primary breast cancers

CNB development studyChemo-prediction validation study
CharacteristicN%N%
All casesa95100180100
Histologic type
 Ductal carcinoma8589.513072.2
 Lobular carcinoma88.42011.1
 Other carcinoma22.13016.7
Tumor size (mm)
 ≤206164.21810
 >203435.816290
Nodal status
 N05658.96737.2
 N12526.36033.4
 N277.44022.2
 N344.2137.2
 Nx33.20
Histologic grade
 G11010.52715
 G257609653.3
 G32829.54625.6
 GX116.1
HER2 status
 Positive1616.800
 Negative7983.2180100
ER status
 Positive8387.417999.4
 Negative1212.610.6
PR status
 Positive7174.715385
 Negative2425.32413.3
 Unknown31.7
Ki67%
 ≤143536.842.2
 >146063.217496.7
 Unknown21.1
  • aOnly cases with clinical data (chemo-prediction validation set).