Table 1. Baseline characteristic of patients in training set.

Characteristics	Responders (n=23)	Nonresponders (n=20)	P value
Age, median [range] (years)	61 [50–76]	67 [41–82]	0.071*
Gender
Male/female	13/10	13/7	0.571**
TNM staging
T1/T2/T3/T4	1/3/16/3	1/2/14/3	0.989**
N0/N1/N2	8/10/5	7/8/5	0.961**
M0/M1	21/2	19/1	0.635**

*, independent-samples t-test; **, chi-square test.