胰腺癌发病率占常见恶性肿瘤的 1%～ 2 % ,位居美国肿瘤死亡第 5位[1] ,国内有逐年增多趋势。由于缺乏有效的早期诊断手段 ,目前胰腺癌的预后仍然较差。在美国每年约有 2 70 0 0例新发胰腺癌病例 ,而同年死于胰腺癌的患者有 2 6 0 0 0例。就诊时大约 5 0 %的患者伴有转移病灶 , The incidence of pancreatic cancer accounts for 1% ~ 2% of common malignant tumors, which ranks the fifth in the United States with tumor death [1]. There is an increasing trend in China every year. Due to the lack of effective early diagnosis, the prognosis of pancreatic cancer is still poor at present. In the United States, there are about 270,000 cases of newly diagnosed pancreatic cancer each year, compared with 26,000 patients who died of pancreatic cancer in the same year. About 50% of patients with metastatic disease at the time of visit,