Table 1.

Distribution of ER−/HER2− carcinomas compared to all other (non-basal) phenotypes grouped together, according to age group (χ² test)

Group of carcinomas	Distribution according to age group, n (%)		P
	≤45 years	≥65 years
Non-basal	53 (70.7)	57 (86.4)	0.0247
ER−/HER2−	22 (29.3)	9 (13.6)
Indeterminate	4	6
Total	79	72

ER = Estrogen receptor.