The researchers also analyzed biopsies that were taken from the distal duodenal mucosa and the stomach of 9 individuals in the control group and 4 pancreatic cancer patients to examine the spatial extent of the field effect 研究者也分析9位对照组和4位胰腺癌患者的远端十二指肠粘膜和胃组织,来证实检查的有效范围。