Biomedical subjects

Masahiro Ohara

Publications and source records attributed to Masahiro Ohara.

6 recordsLinked to original sources

PubMed2006

Histopathologic evaluation of stepwise progression of pancreatic carcinoma with immunohistochemical analysis of gastric epithelial transcription factor SOX2: comparison of expression patterns between invasive components and cancerous or nonneoplastic intraductal components.

OBJECTIVES: The purpose of this study was to perform histopathologic and immunohistochemical analyses of gastric transcription factor SOX2 and gastric mucin MUC5AC to better understand the stepwise progression of pancreatic carcinoma. METHODS: Twenty-eight representative sections from 14 surgically resected pancreatic carcinomas were assessed microscopically. Sites of pancreatic intraepithelial neoplasia (PanIN) were counted, and histologic subtypes of invasive ductal carcinoma (IDC) were determined. The expression of SOX2 and MUC5AC in PanIN and IDC was examined immunohistochemically. RESULTS: One hundred thirty-eight PanINs were identified. In 4 of the 14 cases, gradual transition from PanIN-1A to PanIN-3 was observed in a single duct, suggesting stepwise progression. The expression of MUC5AC increased with the progression of lesions from PanIN-1A to PanIN-3. SOX2 was expressed in only 6 of 107 early PanINs (5.8%). Out of 31 PanIN-3s, 7 were positive (22.6%), and SOX2 protein was localized in the nuclei of cells of the basal epithelium or in the vicinity of luminal necrosis. In addition, SOX2 was frequently and strongly expressed in poorly differentiated (57.1%) and neurally invasive (63.6%) components. CONCLUSIONS: The results of our histopathologic examinations suggest that PanIN progresses stepwise to IDC. Immunohistochemistry results suggest that SOX2 is involved in later events of carcinogenesis.

Aged↗

PubMed2006

Postoperative immunosuppression cascade and immunotherapy using lymphokine-activated killer cells for patients with esophageal cancer: possible application for compensatory anti-inflammatory response syndrome.

Immunological parameters were measured in order to elucidate a postoperative immunosuppression mechanism in transthoracic esophagectomy for patients with esophageal cancer. Moreover, lymphokine-activated killer (LAK) cells were transferred just after the surgery to overcome the postoperative immunosuppression. Fifteen consecutive patients who underwent transthoracic esophagectomy were subjected to the postoperative measurement of immunological parameters. Ten patients who underwent open cholecystectomy served as controls. Heparinized venous blood was obtained pre- and postoperatively, and serum levels of cytokines IL-6 and IL-10 and immunosuppressive acidic protein (IAP) were measured. Peripheral blood lymphocytes were harvested and analyzed by flow cytometry for phenotype detection and by a mixed lymphocyte reaction for detecting concanavalin (Con)-A-induced or -non-induced suppressor activity. Another 29 consecutive patients who underwent transthoracic esophagectomy were randomly enrolled in a postoperative immunotherapy trial either with or without lymphokine-activated killer cells. It was found that, in the esophagectomy group, IL-6 and IL-10 increased postoperatively and peaked on day 1, followed by an increase in IAP, peaked again on day 4, with a profound decrease in helper and cytotoxic T-cell subsets, followed by increases in Con-A-induced (on day 7 or later) and spontaneous (on day 10) suppressor activities. These changes were minimal in the cholecystectomy group. LAK cell transfer restored the postoperative decrease in the helper and cytotoxic T-cell population, and there was a trend of reduction for postoperative remote infection such as pneumonia and surgical site infection in the LAK therapy group. Taken together, we would like to propose the existence of a postoperative immunosuppression cascade consisting of increases in cytokines and immunosuppressive proteins, decreases in helper and cytotoxic T-cell populations, and the development of suppressor T-cell activities in surgery for esophageal cancer. Postoperative adoptive transfer of LAK cells may be a novel clinical application in surgery for esophageal cancer as a means of treating this postoperative immunosuppressive condition that may be identical to the status of compensatory anti-inflammatory response syndrome (CARS).

Aged↗

PubMed2006

Expression of gastric mucin MUC5AC and gastric transcription factor SOX2 in ampulla of vater adenocarcinoma: comparison between expression patterns and histologic subtypes.

The purpose of this study was to examine the expression pattern of MUC5AC and SOX2 in ampulla of vater adenocarcinoma and evaluate the association between expression of these gastric epithelial markers and the histologic phenotype of ampulla of vater carcinoma. Six surgically resected samples of ampulla of vater adenocarcinoma, including four intestinal type carcinomas and two pancreatobiliary type carcinomas, were studied. We performed immunohistochemistry with a monoclonal antibody against MUC5AC and a polyclonal anti-SOX2 antibody. In two of the four intestinal type carcinomas, MUC5AC and SOX2 were focally expressed in the superficial neoplastic mucosa. However, in the centre of the tumour and in other invasive lesions, including vascular invasive lesions and metastatic lymph nodes, neither MUC5AC nor SOX2 was expressed. In contrast, in both pancreatobiliary type carcinomas, expression of MUC5AC and SOX2 was maintained or increased in invasive lesions. Our immunohistochemistry data suggest that MUC5AC and SOX2 are associated with the pancreatobiliary phenotype of ampulla of vater carcinoma and involved in later events in carcinogenesis, such as invasion and metastasis.

Adenocarcinoma↗

PubMed2006

Adoptive immunotherapy using autologous lymphocytes sensitized with HLA class I-matched allogeneic tumor cells.

A 29-year-old female breast cancer patient with multiple bone metastases (HLA-A2) was treated with adoptive transfer using autologous peripheral blood mononuclear cells (PBMCs) activated with the HLA-A2-matched allogeneic GC022588 gastric cancer cell line and interleukin-2 plus an immobilized anti-CD3 antibody culture system. The relief of bone pain in parallel with a decrease of serum carcinoembryonic antigen levels was obtained just after the administration of GC022588-activated effector lymphocytes, and a good quality of life was accomplished for 4 months. The GC022588-activated effector lymphocytes included 44% CD4+, 77% CD8+, and 26% CD4+CD8+ phenotypes, and expressed 25% killing activity against GC022588 stimulator cells at an E/T ratio of 50:1. T cell receptor (TCR) usage analysis for the effector cells showed oligoclonal expression of TCRVbeta1, 3, 9, and 11, especially TCRVbeta5.2, 12, 13.1 and 17, and their killing activity was significantly inhibited in the presence of anti-TCRalphabeta antibody and anti-TCRVbeta12 antibody. SSCP analysis revealed clonotypic bands of TCRVbeta12. These results suggest that shared antigens exist between breast and gastric adenocarcinomas. Allogeneic tumor cells can stimulate PBMCs to generate effector cells with selected TCRCDR3 usages that recognize tumor antigens. These effector lymphocytes may be good candidates for the adoptive immunotherapy of cancer.

CD3 Complex↗

PubMed2005

[Surgical stress].

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Arachidonic Acids↗

PubMed2003

[Clinical evaluation, including QOL of TS-1 for patients with locally advanced or recurrent gastric cancer at ambulatory setting].

PURPOSE: Forty-nine patients with locally advanced or recurrent gastric carcinoma were treated with a novel 5-FU derivatives, TS-1, in an ambulatory setting. The response rate and adverse effect as well as patients' QOL were evaluated. RESULTS: The overall response rate was 38.8% (19/49). Partial response (PR) was obtained in 3 (27%) of 11 primary lesions of the stomach, in 10 (48%) of 21 lymph node metastases, in 6 (40%) of 15 liver metastasis, and in 4 (33%) of 12 peritoneal disseminations, respectively. The average response period was 222.2 days and the 50% survival period was 382 days. In addition, patients' QOL, evaluated by questionnaire, was maintained relatively well during treatment. Conversely, the adverse effects (greater than grade 3) were bone marrow suppression in 3 cases and toxic dermatitis in 1 case, respectively. CONCLUSION: Taken together it is reasonable to conclude that TS-1 is safe and effective for patients with locally advanced or recurrent gastric carcinoma in an ambulatory setting, and is promising as a first line treatment in the general hospital.

Administration, Oral↗