Table 2. Classification performance with tumor volume features, bone structure features, and combined features in the assessment of neoadjuvant chemotherapy response.

Radiomics features	AUC	AUC difference	P value
Tumor volume features	0.7799±0.0044	–	–
Bone structure features	0.7219±0.0121	–	–
Combined features	0.8207±0.0043	–	–
Tumor volume features vs. bone structure features	–	0.0580±0.0130	<0.0001
Tumor volume features vs. combined features	–	0.0408±0.0046	<0.0001
Bone structure features vs. combined features	–	0.0987±0.0121	<0.0001

Data were presented with means ± standard deviations. P value was calculated using the Mann-Whitney U-test. The Holm-Bonferroni method was conducted to correct for multiple comparisons. AUC, area under the receiver operating characteristic curve.