Table 6.

The risk factors of metastases of primary nasopharyngeal carcinoma.

Author	Year	Metastatic sites	Risk factors
Chen et al[25]	2011	Distant metastasis	RNV
Zhao et al[26]	2012	Distant metastasis	LMP1
Cai et al[27]	2014	Distant metastasis	MIP-3α, cystatin A
Zheng et al[28]	2014	Lymphatic metastasis	p-Mnk1, p-elF4E
Tang et al [29]	2016	Distant metastasis	LDL-C
Hu et al[30]	2017	Lymphatic metastasis	VEGFR2 rs2071559
Chen et al[31]	2019	Distant metastasis	EGFR