Table 2. The mean level of CK19-2G2 for lung cancer, benign diseases and healthy controls.

Group	N	CK19-2G2
		Mean (mU/mL)	SD
Case (pre-operation)	630	8.92	9.94
NSCLC	553	9.20	10.27
ADC	345	8.21	6.57
SCC	208	10.83	14.30
SCLC	36	6.46	6.23
Benign disease	134	0.71	0.78
Healthy	263	0.26	0.19

Abbreviation: NSCLC = non-small cell lung cancer; ADC = adenocarcinoma; SCC = squamous cell carcinoma; SCLC = small cell lung cancer.