Table 3. Clinicopathological characterization of primary lung cancer patients as well as presence of SNP (c.309T>G) in the MDM2 gene and allele frequency.

Characteristics		Patients (%)
Sex	Male	220 (57.4)
	Female	163 (42.6)
Age	Mean±SD	66.4±9.9 (years old)
Histological cell type	Adenocarcinoma	306 (79.9)
	Squamous cell carcinoma	40 (10.4)
	Others	37 (9.7)
SNP (c.309T>G) in the MDM2 gene	T/T	82 (21.4)
	T/G	170 (44.4)
	G/G	131 (34.2)
Allele frequency	T	334 (43.6)
	G	432 (56.4)