| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Research Abstract |
The expression of sialylated MUC1 mucin was examined in 55 pancreatic ductal adenocarcinomas, 2 normal pancreas specimens, 3 chronic pancreatitis specimens, I ductal hyperplasia of the pancreas, 3 mucinous cystadenomas, and 2 liver metastases from pancreatic ductal adenocarcinoma. Expression was assessed by immunohistochemistry with a new monoclonal antibody (mAb) (MY.1E12). Sialylated MUC1 mucin was expressed in the cancer cell membrane in all the ductal carcinomas. The reaction product was seen at the apical aspect of cells when these was tubule formation. This pattern was also detected in mucinous cystadenomas. However, it was seen diffusely in the cell membrane in single cancer cells or small clusters of cells without tubule formation and in metastatic liver tumors. Namely, invading or metastatic cancer cells expressed this type of mucin throughout the entire cell membrane. The expression of sialylated MUC1 mucin was not observed in specimens from normal pancreas, chronic pancreati
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tis, or ductal hyperplasia of the pancreas. In normal pancreas and these lesions expression of sialylated MUC1 was limited to acini and secreted mucin. Sialylated MUC1 mucin which expressed throughout the cancer cell membrane may be a factor in the metastatic potential of pancreatic ductal adenocarcinoma.
Cytotoxic T lymphocytes (CTLs) against MUC1 was induced in pancreas cancer patients. CTLs were induced by peripheral blood mononuclear cells stimulated by MUCi-expressed human pancreatic cancer cell line, YPK-1, added interleukin-2. Interestingly, these CTLs directly recognized MUC1 molecules in an HLA-unrestricted manner unlike conventional CTLs. We treated patients with 18 pancreatic cancer (resectable 10, unresectable 8) using these CTLs. A little effects were observed in patients with unresectable tumors. However, none of patient who underwent curative resection and was treated by GTLs after surgery had liver metastasis. These results indicated that adoptive immunotherapy using MUC1 recognized CTLs could be useful for pancreatic cancer patients who underwent curative resection. Less
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