Biomedical subjects

Bunzo Nakata

Publications and source records attributed to Bunzo Nakata.

21 records · Page 2Linked to original sources

PubMed2002

Genetic alterations in adenoma-carcinoma sequencing of intraductal papillary-mucinous neoplasm of the pancreas.

We investigated the adenoma-carcinoma sequence in intraductal papillary-mucinous neoplasm from the aspect of genetic changes. The formalin-fixed paraffin-embedded tumors and surrounding normal pancreatic tissues from patients with 16 intraductal papillary-mucinous adenoma of the pancreas (IPMA) and 10 intraductal papillary-mucinous carcinoma of the pancreas (IPMC) were provided for DNA extraction after microdissection. SSCP-DNA sequencing analysis demonstrated K-ras mutations at codon 12 in 75% of IPMA and 70% of IPMC, while those at codon 13 were observed neither in IPMA nor IPMC. There were no characteristic K-ras mutation types in IPMA and IPMC and no significant differences in incidence of K-ras mutations between the two categories. The frequencies of p53 mutations analyzed by SSCP-DNA sequencing were not high in IPMA (18.8%) and IPMC (30%), showing no significant difference between them. LOHs of APC in IPMA and IPMC were infrequent (6.3 and 20%, respectively) and showed no significant difference in incidence between the two categories. The LOH frequencies of DCC in IPMA and IPMC were 31.3 and 40%, respectively, and were not statistically different from each other. Taken together, genetic changes such as K-ras, p53, APC and DCC mutations may not be associated with adenoma-carcinoma sequence in intraductal papillary-mucinous neoplasm of pancreas.

Adenocarcinoma, Mucinous↗

PubMedDate not supplied

Negative hMSH2 protein expression in pancreatic carcinoma may predict a better prognosis of patients.

The prognostic values of immunohistochemical staining for hMSH2 and hMLH1 in patients with pancreatic carcinomas were investigated. Fifty-five patients with histologically proven pancreatic carcinomas were studied. Immunohistochemical staining for hMSH2 and hMLH1 was performed by avidin-biotin-peroxidase complex method with a catalyzed signal amplification system. Tumor cells that exhibited an absence of nuclear staining in the presence of non-neoplastic cells with nuclear staining were considered to have an abnormal pattern. Four tumors (7.3%) demonstrated abnormal hMS2-negative staining. One tumor (1.8%) had abnormal hMLH1-negative staining and this tumor showed negative hMSH2 staining. No particular clinicopathologic factor such as tumor location, histology, T-factor, N-factor and TNM-stage were observed in patients with negative hMSH2 staining tumors. Median survival time (MST) of patients with hMSH2-negative tumors was comparatively longer than that of patients with hMSH2-positive tumors, however, there was no significant difference between MSTs of the two groups (56 months vs. 14 months; p=0.16). We concluded that negative hMSH2 immunohistochemical staining in the pancreatic carcinomas may demonstrate certain patients, but not all, who had microsatellite instability-positive tumors. The patients with hMSH2-negative tumors may have better prognoses than those with hMSH2-positive tumors. To clarify these findings, further large number of pancreatic carcinomas must be investigated.

Adaptor Proteins, Signal Transducing↗

PubMedDate not supplied

Oral UFT and cyclophosphamide combination chemotherapy for metastatic breast cancer.

BACKGROUND: Effective long-term chemotherapy yielding good quality of life is essential. The clinical benefits of oral UFT and cyclophosphamide (CPA) combination chemotherapy for metastatic breast cancer (MBC) were evaluated. PATIENTS AND METHODS: Twenty cases with MBC were enrolled. The mean age was 54 years. Five cases had loco-regional and others had distant metastasis. Nineteen cases had previous therapies. Daily treatment consisted of UFT (300 to 400 mg/body) and CPA (100 to 150 mg/body), both given orally. RESULTS: The treatment period ranged from 4 to 80 weeks. The response rate was 35%, while it was 65% in the "stable disease > 6 months" category. The mean time to the first sign of response was 7 weeks and the time to tumor progression was 37 weeks. The frequent adverse effects were leukocytopenia (55%) and gastrointestinal symptoms (35%). The incidence of adverse grade > or = 3 effects was 25%. CONCLUSION: Oral UFT and CPA combination chemotherapy may be suitable for MBC.

Adult↗