Diagnostic Usefulness of Simultaneous Measurement ofSerum Tumor Markers in Lung Cancer Patients

Abstract

연구배경: 폐종양환자의 혈청에서 증가되는 종양표지자는 여러가지 알려져 있다. 그러나 CEA이외는 기본적으로 시행되는 경우는 드물다. 2가지 이상의 종양표지자를 사용하면 민감도를 높일수 있으며 이중 CEA는 선암에 SCC Ag는 편평세포암에 NSE는 소세포암에 각각 민감도가 높은 것으로 보고되고 있다. 이 3가지 표지자를 동시에 측정하는 것의 진단적 가치를 알아보고자 본연구를 시행하였다. 방법: 폐암군 113예(남자 90명, 여자 23명)와 대조군 103예(남자 61명, 여자 43명)로 하였다. 편평세포암 70예, 선암 30예, 소세포폐암 13예 였다. 대조군은 양성 폐질환 환자를 대상으로 하였고 폐결핵 55예, 노인성폐질환 24예, 폐렴 11예, 기타 13예 였다. 혈청을 채취후 CEA는 측정은 CEA EIA kit(Roche사, German)를 이용하여 Sandwich Enzyme Immunoassay방법으로, SCC Ag의 측정은 Microparticle Enzyme Immunoassay(MIEA)방법의 IMx SCC Assay Kit(Abbott사, USA)를 사용하였고 NSE의 측정은 CEA와 같은 방법으로 NSE EIA Kit(Roche사, German)를 이용하였다. 결과: 1) 폐암군 표지자값은 CEA $12.1{\pm}6.7ng/ml$ , SCC Ag $2.1{\pm}3.1ng/ml$ , NSE $13.7{\pm}2.2ng/ml$ 이었고 대조군의 수치보다 유의하게 높았다(각각 P 【Introduction: This study was performed to evaluate the diagnostic usefulness of simultaneous determination of 3 tumor markers {serum carcinoembryonic antigen(CEA), squamous cell carcinoma antigen (SCC Ag) and neuron specific enolase(NSE)} in lung cancer patients. Method: In 113 patients with primary lung cancer(70 with squamous cell carcinoma, 30 with adenocarcinoma, 13 with small cell carcinoma) and 103 patients with benign lung diseases, serum CEA and NSE were measured by enzyme immunoassay, and SCC Ag was measured by microparticle enzyme immunoassay. Results: 1) The mean serum levels of 3 tumor markers were significantly higher in lung cancer groups than benign lung disease groups respectively(p=0.001). 2) In squamous cell carcinoma, the SCC Ag was elevated in 67%, in adenocarcinoma CEA was elevated in 77% and in small cell carcinoma NSE was elevated in 77%, but there were no significant differences according to the stage of each cancer cell types. 3) CEA was the most sensitive marker, but nonspecific to cancer types. SCC Ag was less sensitive than other markers, but more specific toward squamous cell carcinoma, and NSE was more specific to primary lung cancer. 4) As the number of positive tumor markers was increased, the relative possibility of lung cancer was also increased. If two markers were positive, it increased to 77%, and if three markers were positive it increased to 90%. Conclusion: The simultaneous measurement of serum CEA, SCC Ag and NSE would provide additional information for the diagnosis of lung cancer.】