More expression of BDNF associates with lung squamous cell carcinoma and is critical to the proliferation and invasion of lung cancer cells

Table 1 Statistical analysis on the correlations between BDNF expression by immunohistochemical staining in 110 lung cancer samples and the clinicopathological parameters

Clinicopathological Characteristics	Cases (n = 110)	Low expression (n = 49)	High expression (n = 61)	p-value
Histological type
Squamous cell carcinoma	53	20	33	0.017
Adenocarcinoma	57	29	18	0.017
Grade
well-moderate	76	31	45	0.236
poor	34	18	16	0.236
Stage
I-II	72	36	36	0.113
III	38	13	25	0.113
Tumor size and extension
T1-T2	75	39	36	0.021
T3	35	10	25	0.021
Lymph node metastasis
No	68	30	38	0.532
Yes	42	19	23	0.532

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