Table 1.

Clinical characteristics of HER2− and HER2+ patients.

Group	HER2−			HER2+
Covariate	Controls (n = 80)	Cases (n = 38)	p	Controls (n = 56)	Cases (n = 11)	p
Age (median)	55 years	52 years	0.330	57.5 years	60 years	0.972
BMI (≥30)	26 (35%)	11 (31%)	0.665	14 (25%)	3 (27%)	0.842
Nodes (>4)a	8 (10%)	11 (29%)	0.009	9 (16%)	2 (18%)	0.863
Race
White	61 (76%)	31 (81%)	0.514	42 (75%)	7 (64%)
Black	11 (14%)	6 (16%)		9 (16%)	3 (27%)
Other/unknown	8 (10%)	1 (3%)		5 (9%)	1 (9%)	0.437
High-grade	10 (13%)	10 (26%)	0.062	24 (43%)	6 (46%)	0.476

BMI body mass index

^ap < 0.05 in HER2− group