Table 2.

Comparison of the patient characteristics between the training and validation cohorts.

		Train	Validation	p Value
		n = 195 (73.6%)	n = 70 (26.4%)
Pathology	non-pCR	176 (90.3%)	62 (88.6%)	0.865
	pCR	19 (9.7%)	8 (11.4%)
Age, years		48.5 ± 8.4	51.0 ± 9.9	0.043
Tumor size, mm		35.0 ± 21.1	40.0 ± 19.9	0.086
ER expression, %		85.2 ± 21.7	82.8 ± 22.5	0.408
PR expression, %		30.9 ± 35.7	41.7 ± 38.0	0.016

Abbreviations: pCR—pathologic complete response; ER—estrogen receptor; PR—progesterone receptor.