Table 7.

The mean optical density of the immunohistochemical staining of tissues

	Mean optical density ($\bar{x}$ ± S)
Group	OSCC tissue	Normal tissue	P.Value
GDF15	0.4657 ± 0.0291	0.3381 ± 0.0130	< 0.0001
MMP3	0.3661 ± 0.1076	0.2845 ± 0.0334	0.0433
AXL	0.4190 ± 0.0669	0.3523 ± 0.0254	0.0127
MCSF	0.6044 ± 0.0526	0.3522 ± 0.0255	< 0.0001
I309	0.4656 ± 0.0634	0.3459 ± 0.0282	< 0.0001
CTACK	0.3641 ± 0.025	0.3035 ± 0.0273	< 0.0001