Table 3.

Correlations between expression change of ferroptosis-related protein and HDAC1 in the pre- neoadjuvant chemotherapy and post- neoadjuvant. chemotherapy.

Protein	Expression change of HDAC1
	Poor pathological response		Good pathological response
	r	P value	r	P value
Expression change of xCT	−0.385	.127	0.495	<.001
Expression change of GPX4	0.171	.511	0.435	<.001
Expression change of ABCB1	0.692	.002	0.433	<.001

ABCB1 = ATP binding cassette subfamily B member 1, GPX4 = glutathione peroxidase 4, HDAC1 = histone deacetylases 1, NAC = neoadjuvant chemotherapy, xCT = glutamate-cysteine reverse transporter protein.