Table 2. Distribution of tumor markers in different stages of NSCLC and SCLC.

Variable	Median		Cut-off
	NSCLC	SCLC
ProGRP (ng/L)
I	35.5	168.6	56.0
II	35.3	312.7	61.0
I–II	35.0	253.3	56.0
III	35.0	618.1	71.0
IV	34.5	1,365.8	99.0
NSE (µg/L)
I	11.7	14.2	13.0
II	13.0	18.1	17.0
III	13.5	29.1	22.0
IV	14.8	53.6	26.0

NSCLC, non-small cell lung cancer; SCLC, small cell lung cancer; ProGRP, roles of gastrin-releasing peptide; NSE, neuron-specific enolase.