Table 2. The relationship of expression of SIX4 with clinical feature of TCGA.

Clinical feature		SIX4 (mean ± SD)	t	P
Age	<60	4.385 ± 1.483	0.117	0.907
	≥60	4.365 ± 1.553
Sex	Male	4.312 ± 1.477	0.817	0.414
	Female	4.444 ± 1.588
M stage	M0	4.366 ± 1.52	0.117	0.907
	M1	4.387 ± 1.554
T stage	T1 + T2	3.587 ± 1.372	4.857	1.889E-06
	T3 + T4	4.556 ± 1.506
TNM stage	I	3.704 ± 1.398	3.664	2.857E-04
	II + III + IV	4.499 ± 1.52
N stage	N0	4.007 ± 1.557	2.33	0.02
	N1 + N2	4.365 ± 1.554