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World J Gastroenterol ; 12(19): 3038-43, 2006 May 21.
Article in English | MEDLINE | ID: mdl-16718784

ABSTRACT

AIM: To determine whether gastric and enteric Helicobacter species are associated with pancreatic cancer. METHODS: Patients with exocrine pancreatic cancer (n = 40), neuroendocrine cancer (n = 14), multiple endocrine neoplasia type 1 (n = 8), and chronic pancreatitis (n = 5) were studied. Other benign pancreatic diseases (n = 10) and specimens of normal pancreas (n = 7) were included as controls. Pancreatic tissue specimens were analyzed by Helicobacter-specific PCR-assay and products were characterized by denaturing gradient electrophoresis and DNA-sequencing. From a subset of the pancreatic cancer patients, gastric and/or duodenal tissue as well as gallbladder and ductus choledochus tissue were analyzed. Gallbladder and choledochus samples were included as controls. Stomach and duodenum samples were investigated to analyze whether a gastric helicobacter might disseminate to the pancreas in pancreatic cancer patients. Pancreatic specimens were analyzed by Bacteroides-specific PCR for detecting the translocation of indigenous gut microbes to the diseased pancreas. RESULTS: Helicobacter DNA was detected in pancreas (tumor and/or surrounding tissue) of 75% of patients with exocrine cancer, 57% of patients with neuroendocrine cancer, 38% of patients with multiple endocrine neoplasia, and 60% of patients with chronic pancreatitis. All samples from other benign pancreatic diseases and normal pancreas were negative. Thirty-three percent of the patients were helicobacter-positive in gastroduodenal specimens. Surprisingly, H. bilis was identified in 60% of the positive gastroduodenal samples. All gallbladder and ductus choledochus specimens were negative for helicobacter. Bacteroides PCR-assay was negative for all pancreatic samples. CONCLUSION: Helicobacter DNA commonly detected in pancreatic cancer suggests a possible role of the emerging pathogens in the development of chronic pancreatitis and pancreatic cancer.


Subject(s)
Carcinoma, Neuroendocrine/microbiology , DNA, Ribosomal/analysis , Duodenum/chemistry , Helicobacter/genetics , Multiple Endocrine Neoplasia Type 1/microbiology , Pancreas/chemistry , Pancreatic Neoplasms/microbiology , Stomach/chemistry , Adult , Aged , Bacteroides/genetics , Bacteroides/physiology , Carcinoma, Neuroendocrine/etiology , Carcinoma, Neuroendocrine/genetics , Case-Control Studies , Common Bile Duct/chemistry , Common Bile Duct/microbiology , DNA, Ribosomal/genetics , Duodenum/microbiology , Female , Gallbladder/chemistry , Gallbladder/microbiology , Helicobacter/physiology , Helicobacter Infections/complications , Helicobacter Infections/genetics , Humans , Male , Middle Aged , Multiple Endocrine Neoplasia Type 1/etiology , Multiple Endocrine Neoplasia Type 1/genetics , Pancreas/microbiology , Pancreatic Neoplasms/etiology , Pancreatic Neoplasms/genetics , Polymerase Chain Reaction , Stomach/microbiology
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