Table 1.

Characteristics of triple-negative breast cancer patients.

TNBC	Negative	BRCA1	BRCA2	p-Value
Number of patients (159)	123	34	2	*	**
Mean age at diagnosis (y)	44.78 (24–59) SD 9.07	36.97 (26–54) SD 8.74	45.00 (39–51) SD 8.48	0.004	<0.001
Age group (y)				<0.001	<0.001
≤30	5 (4.0%)	9 (26.5%)	0
31–40	31 (25.2%)	13 (38.3%)	1 (50%)
41–50	52 (42.3%)	10 (29.4%)	0
51–60	35 (28.5%)	2 (5.9%)	1 (50%)
Ki 67 (%)				0.508	0.462
≤20	11 (10.1%)	1 (3.3%)	0
>20	98 (89.9%)	29 (96.7%)	1 (100%)
unknown	14	4	1
Bilaterality				0.193	0.088
Yes	5 (4.2%)	4 (12.9%)	0
No	114 (95.7%)	27 (87.1%)	2 (100%)
unknown	4	3	0
Histotype				0.466	0.301
ductal	103 (95.4%)	28 (90.3%)	2 (100%)
lobular	0	1 (3.2%)	0
others	5 (4.6%)	2 (6.5%)	0
unknown	15	3	0
RO				0.321	0.226
negative	116 (95.1%)	30 (88.2%)	2 (100%)
1–9 %	6 (4.9%)	4 (11.8%)	0
unknown	1	0	0

* Comparison Negative vs. BRCA1 vs. BRCA2; ** Comparison Negative vs BRCA1.