Overexpression of sphingosine kinase 1 is associated with salivary gland carcinoma progression and might be a novel predictive marker for adjuvant therapy

Table 4 Spearman correlation analysis between SPHK1 and clinical pathologic factors

Variables	SPHK1 expression level
	Spearman Correlation	P-Value
Clinical staging	0.277	<0.001
T classification	0.239	0.020
N classification	0.158	0.004
M classification	0.234	0.003
Pathologic Differentiation	0.245	0.020

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