Department of General Surgery;
the First Affiliated Hospital of Nanjing Medical University;
Nanjing 210024;
Jiangsu Province;
China;
The Molecular Biology Research Center of Nanjing Medical University;
Nanjing 210029;
Jiangsu Province;
China;
pancreatic; neoplasms/diagnosis; polymerase; chain; reaction; biopsy; needle; genes; ras; pancreatic; diseases; pancreatic; juice; gene; amplification; cytodiagnosis;