alexa Abstract | A Case of Pancreatic Cancer with Formation of a Mass Mimicking Alcoholic or Autoimmune Pancreatitis in a Young Man. Possibility of Diagnosis by Hypermethylation of Pure Pancreatic Juice

JOP. Journal of the Pancreas
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Context Mass-forming pancreatitis can be divided into two distinct types: alcoholic and autoimmune. There have been some cases of an ambiguous diagnosis although care was taken to differentiate between alcoholic massforming pancreatitis, focal type autoimmune pancreatitis and pancreatic cancer.Case report We report a case of pancreatic cancer mimicking alcoholic or autoimmune pancreatitis with the formation of a mass in a 32-year-old man with a history of heavy drinking. Although both serum immunoglobulin G and immunoglobulin G4levels were normal, many serum autoantibodies, including the antinuclear antibody, were detected. After he stopped drinking, abdominal computed tomography showed a pancreatic head mass 28 mm in diameter with little and weak enhancement in the early and delayed phases, respectively. Endoscopic retrograde cholangiopancreatography showedan obstruction of the main pancreatic duct in the pancreatic head and marked stenosis of the lower common bile duct. Although a percutaneous ultrasound-guided pancreatic biopsy demonstrated no evidence of autoimmune pancreatitis, he was treated with prednisolone to test the efficacy of steroid therapy. However, the pancreatic mass became enlarged after steroid therapy, and he underwent surgery during which the mass was found to be pancreatic cancer. Although the patient was treated with gemcitabine, he died 5 months after surgery. We retrospectively assessed DNA hypermethylation in the patient’s pure pancreatic juice obtained on admission. We observed hypermethylation of the cancer-specific gene tissue factor pathway inhibitor 2 (TFPI2). Conclusion This finding suggests that if the DNA hypermethylation of pure pancreatic juice had been assayed before steroid therapy, it would have supported the diagnosis of pancreatic cancer, and steroid therapy could have been avoided.

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Author(s): Yoshiharu Motoo Gensaku Okada Hisatsugu Mouri Toshifumi Gabata Hiroyuki Watanabe Koushiro Ohtsubo Tomoya Tsuchiyama Yasushi Yamaguchi Norio Sawabu Takashi Okai Koji Amaya Hirohisa Kitagawa Tetsuo Ohta Koichiro Matsuda Hideki Ohta

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