胰腺癌发病率占常见恶性肿瘤的 1%～ 2 % ,近年来世界范围内有明显增多趋势[1] ,位居美国肿瘤死亡第 5位。由于缺乏有效的早期诊断手段 ,目前胰腺癌的预后较差。在美国每年约有 2 70 0 0例新发病例 ,而同期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, and in recent years there is a clear trend of increase worldwide [1], ranking 5th in the United States. Due to the lack of effective early diagnosis, the prognosis of pancreatic cancer is poor at present. In the United States, there are about 270,000 new cases each year, compared with 26,000 patients who died of pancreatic cancer in the same period. Approximately 50% of patients with metastatic disease at the time of visit