Table 3.

Association between BPE and molecular subtypes

	Luminal A (n = 82)	Luminal B (n = 24)	HER2 (n = 32)	Triple-negative (n = 48)	p value
Baseline BPE	2.55 ± 0.85	2.42 ± 0.97	2.47 ± 0.92	2.67 ± 0.86	0.6445
Post-NAC BPE	1.55 ± 0.63	1.58 ± 0.5	1.41 ± 0.61	1.5 ± 0.62	0.6611
Change in BPE	1 ± 0.98	0.83 ± 1.02	1.06 ± 0.98	1.17 ± 0.93	0.5691

BPE, background parenchymal enhancement; NAC, neoadjuvant chemotherapy.