目的：研究肿瘤标志物ＣＡ２４２与ＣＡ１９－９对胰腺癌的诊断作用。方法：选择１９９６年４月至１９９７年６月在北京医院门诊及住院的患者，共有１９７例进行了血清ＣＡ１９－９的检测，１４８例进行了ＣＡ２４２的检测，其中２５例为临床明确诊断为胰腺癌的患者，１２例为急性胰腺炎患者，１８例为良性阻塞性黄疸患者。结果：胰腺癌患者血清ＣＡ１９－９和ＣＡ２４２较对照组明显增高，其中２５例胰腺癌患者有２１例ＣＡ１９－９阳性，检测的灵敏度为８４％，特异度为７４．４％，有１７例ＣＡ２４２阳性，检测的灵敏度为６８％，特异度为８７．８％。ＣＡ２４２与ＣＡ１９－９比较，灵敏度无显著区别（０．１０＜Ｐ＜０．２５）；而特异度则显著增高（Ｐ＜０．０１）。１２例急性胰腺炎患者有４例血清ＣＡ１９－９阳性（３３．３％），但ＣＡ２４２仅１例阳性（８．３３％）。１８例良性梗阻性黄疸患者ＣＡ１９－９有１６例阳性（８８．８％），而ＣＡ２４２检测仅２例阳性（１１．１％）。结论：血清ＣＡ２４２和ＣＡ１９－９可用于胰腺癌的诊断，且ＣＡ２４２对胰腺癌的诊断优于血清ＣＡ１９－９，在不显著影响检测的灵敏度的情况下，可显著提高诊断的特异度，增加诊断的可靠性。 Objective: To study the role of tumor markers CA242 and CA19-9 in the diagnosis of pancreatic cancer. METHODS: From April 1996 to June 1997, patients with outpatient and inpatient hospitals in Beijing Hospital were selected. A total of 197 patients were tested for serum CA19-9, and 148 patients were tested for CA242. 25 of them were clinically diagnosed as pancreas. Of the cancer patients, 12 were patients with acute pancreatitis and 18 were patients with benign obstructive jaundice. Results: The serum levels of CA19-9 and CA242 in pancreatic cancer patients were significantly higher than those in the control group. Twenty-five cases of pancreatic cancer were positive for CA19-9 in 21 cases. The sensitivity of detection was 84%, the specificity was 74.4%, and there were 17 cases of CA242. Positive, the detection sensitivity was 68%, and the specificity was 87.8%. There was no significant difference in sensitivity between CA242 and CA19-9 (0.10