Problems in the Diagnosis and Treatment of a So-called Mucin-Producing Tumor of the Pancreas

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Abstract
Reports of a so-called “mucin-producing tumor of the pancreas” are increasing worldwide. Although the clinico-pathologic features and therapeutic strategies of this tumor have been enthusiastically investigated, there are still many unanswered questions regarding this ailment. In this study, problems in the diagnosis and treatment of mucin-producing tumor were analyzed, based on the 259 reported cases of this tumor. The overall 5-year survival rate for resected cases is 83%, which is much higher than that for ordinary duct cell carcinoma (17.3%). However, the 5-year survival rate for carcinoma cases with infiltration into other organs is 28%, which is much lower than those for carcinoma cases without infiltration (86%) and carcinoma cases with infiltration that remained within the pancreatic parenchyma (74%). These results demonstrate that patients with this tumor have a poor prognosis if the tumor infiltrates other organs. In addition, when the spread of the tumor is >6 cm, the prognosis is significantly worse than when the tumor has a spread of <6 cm. The significance of using the presence of K-ras mutation in the pancreatic juice for diagnosis of this tumor and problems of duodenum-preserving pancreatic head resection are discussed.

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