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Biomedical subjects

Y Aiyoshi

Publications and source records attributed to Y Aiyoshi.

At least 19 recordsLinked to original sources
PubMed1998

Expression of alpha-fetoprotein and prostate-specific antigen genes in several tissues and detection of mRNAs in normal circulating blood by reverse transcriptase-polymerase chain reaction.

BACKGROUND: alpha-Fetoprotein (AFP) and prostate-specific antigen (PSA) in serum are widely used as tumor markers in the evaluation of prognosis and management of patients with hepatocellular carcinoma and prostate cancer, respectively. To establish the molecular diagnosis of cancer, reverse transcriptase polymerase chain reaction (RT-PCR) for AFP and PSA was used to identify circulating cancer cells in the blood of cancer patients. Here, we examined the tissue-specificity of AFP and PSA and tested whether AFP and PSA are suitable targets in the detection of certain cancer cells by RT-PCR using peripheral blood samples. METHODS: Tissue specificity of AFP and PSA was analyzed by Northern blotting and RT-PCR. Probes for AFP and PSA were hybridized with poly A+ RNAs from 50 human tissues. RT-PCR for AFP and PSA mRNA was performed using several cancerous tissues and normal tissues and peripheral blood cells from seven healthy volunteers. RESULTS: Broad expression of AFP was observed in several tissues and a large amount of AFP mRNA was found in fetal liver. PSA was expressed in prostate, salivary gland, pancreas and uterus. By RT-PCR, AFP and PSA mRNA were detected in several tumors, including salivary pleomorphic adenoma, hilar bile duct carcinoma, pancreatic carcinoma, transitional cell carcinoma of urinary bladder and thyroid papillary carcinoma. Furthermore, AFP and PSA mRNAs were frequently detected by RT-PCR, even in peripheral blood cells from healthy volunteers. CONCLUSIONS: Neither AFP nor PSA showed tissue-specific expression. AFP and PSA mRNA were detected in several diseased and non-diseased tissues and normal circulating blood by RT-PCR.

Adenoma, Pleomorphic↗
PubMed1994

[Clinical diagnosis of early breast cancer].

During the recent 5 years between 1988 and 1992, 254 cases of breast cancer were experienced in the Tsukuba University Hospital. Of them, 80 cases were palpable cancers measuring less than 2cm and 37 cases were nonpalpable cancers. The total of early cancers was 117 cases, 43.3% of all cases. Noninvasive carcinoma without minimally invasive carcinomas were 35 cases, 13.2% (ductal ca: 27, lobularca: 2, Paget ca: 6). According to the palpability of tumour mass, the sensitivity and accuracy rate of palpable early masses are 56.6% and 88.4% by physical examination, 57.9% and 96.4% by mammography, 77.6% and 82.5% by echography respectively. Those of nonpalpable diseases are 29.0% and 88.8% by physical examination, 42.9% and 91.2% by mammography, and 32.1% and 76.8% by echography. The sensitivity of echography for palpable breast cancer is extremely high. On the other hand, mammography is the most effective for nonpalpable cancer. For the detection of noninvasive carcinoma, characteristics of nipple discharge, measurement of CEA in nipple discharge and erosion of the nipple are other important factors.

Adult↗
PubMed1993

Comparison of mutations of ras oncogene in human pancreatic exocrine and endocrine tumors.

BACKGROUND: Ras oncogene mutations have been found in many human cancers; however, pancreatic endocrine tumors have rarely been studied. The purpose of this study was to analyze ras mutations in pancreatic endocrine tumors and to compare these results with the incidence of ras mutations in pancreatic exocrine cancers studied in our laboratory. METHODS: Ras oncogene mutations were studied in 33 foregut endocrine tumors (pancreatic 31, duodenal submucosa 2). Eleven were insulinomas, 12 gastrinomas, 2 glucagonomas, and 11 others were nonfunctioning islet cell carcinomas. Thirteen were benign and 20 were malignant. These were compared with 65 pancreatic exocrine cancers. Tumors were microdissected from paraffin-embedded sections. DNA was extracted and amplified by polymerase chain reaction. Mutations were detected by a oligonucleotide hybridization method with sequence-specific phosphorus 32-radiolabeled probes. RESULTS: No ras mutations were identified among the 33 pancreatic endocrine tumors. In contrast, 51 of 65 (78.5%) pancreatic exocrine cancers exhibited a ras mutation. Fifty were K-ras mutations and one unusual tumor exhibited a N-61 ras mutation. CONCLUSIONS: Ras oncogene mutations do not play a role in the tumorigenesis of pancreatic endocrine tumors.

Adenoma, Islet Cell↗
PubMed1990

The biological characteristics and chemosensitivity of anaplastic thyroid carcinoma transplanted into nude mice.

Three xenografts established from three patients with anaplastic thyroid carcinoma were investigated for their biological characteristics and chemosensitivity. The histological and immunohistochemical findings of these tumors were almost the same as those of the original tumors. Although the growth rate of each xenograft was constant, the tumor doubling time varied from 4.8 per 9.0 days, and the labeling indexes, determined using bromodeoxyuridine pulse labeling, varied from 11.4 to 25.1 per cent. The chemosensitivity tests were performed according to the Battelle Columbus Laboratories Protocol, with adriamycin, cyclophosphamide, cisplatin, mitomycin C and tegafur administered intraperitoneally to tumor-bearing nude mice in maximum tolerable doses. Tumors with slower growth rates tended to be sensitive to more drugs. Furthermore, cyclophosphamide showed antitumor effects against all the tumors tested. Although previous treatments of the original tumors may have affected the results, our results suggest that a more suitable chemotherapy for anaplastic thyroid carcinoma could be developed.

Aged↗
PubMed1990

Ultrasonically guided biopsy of nonpalpable lesions of the breast by the spot method.

A new biopsy method by injecting dye under ultrasonic guidance is most efficient and accurate for nonpalpable lesions revealed by ultrasonography. It can also minimize the amount of tissue that is resected. The conventional method by needle-wire localization has to be used in instances of calcification which cannot be defined by ultrasonography.

Adult↗
PubMed1989

Study of cell kinetics in anaplastic thyroid carcinoma transplanted to nude mice.

The cell kinetics of the transplantable human anaplastic thyroid carcinoma were studied in athymic nude mice using bromodeoxyuridine (BrdU) pulse labeling. In order to estimate the cell cycle time in this study, the percent labeled mitosis curve was prepared with immunoperoxidase staining using monoclonal antibody to BrdU instead of 3[H]thymidine autoradiography. This technique was considered to be very useful because it can be done for a short term and can still be changed to the autoradiographic method. Comparing the results in this study with already reported data on various xenografts of human carcinomas in nude mice, the tumor doubling time (117.5 hr) and the cell cycle time (23.5 hr) were rather short, but the growth fraction (54%) and the cell loss factor (68%) were nearly equivalent to the median value. These findings suggest that the very rapid growth rate of this tumor was mainly due to the shortness of the cell cycle time.

Animals↗
PubMed1989

A case of metastasis from gastric cancer to the thyroid gland.

Metastatic tumors in the thyroid gland are rarely seen in clinical practice. This report describes a case of metastasis from gastric cancer to the thyroid, found five years after removal of the primary gastric lesion. The patient had a large thyroid mass extending to the mediastinum, but there were no obvious metastatic lesions anywhere except in the thyroid. Subtotal thyroidectomy was performed and histological examination revealed the same findings a those of the original gastric cancer. Of additional interest are the findings that led us to believe this metastatic tumor produced alpha-fetoprotein. Seven months following the operation, the patient dies suddenly and, although it is difficult to say whether the patient's survival was prolonged, we believe that the thyroid surgery gene him considerable palliation.

Adenocarcinoma↗
PubMed1989

[Histopathological study of juvenile thyroid carcinoma].

We have examined 12 cases of juvenile thyroid carcinoma histopathologically. The characteristics uncovered of juvenile thyroid carcinoma have been summarized below. 1) The predominant histological type was a papillary carcinoma with abundant follicular components. Which was inclined to show trabecular and solid pattern. 2) The growth pattern was highly infiltrative, showing a frequent extrathyroidal extension, a wide intrathyroid spread, and a severe involvement of the lymph nodes. 3) Many psammoma bodies were observed frequently. 4) Remarkable lymphocytic infiltration was seen in the thyroid around the tumor, and in one case it resembled chronic thyroiditis. In addition, a case of a multicentric papillary carcinoma showed unusual histological features.

Adenocarcinoma↗
PubMed1988

[Recently experienced ten cases of insulinoma--preoperative diagnosis of localization and intraoperative simultaneous monitoring of glucose and insulin].

We have experienced 10 cases of insulinoma during the last 10 years from 1977 to 1986. All cases had strong hypoglycemic symptoms such as disturbance of consciousness, and insulinoma still tended to be misdiagnosed as epilepsy. The diagnosis of insulinoma was easily available from serum IRI (immunoreactive insulin)/plasma glucose ratio in all of the ten cases. As preoperative procedures for the diagnosis of localization, arteriography, computed tomography and portal blood sampling were positive in 6 of 8, 4 of 6 and 2 of 2 patients, respectively. At operation, all insulinomas could be identified by digital palpation. We performed simple excision of the tumor in 6 patients and distal pancreatectomy in 4 patients. The tumors were solitary and benign in all patients, ranging in size from 1.0 cm to 4.5 cm. Three cases were presented as case reports. In these cases, portal blood sampling and/or intraoperative monitoring of plasma glucose and serum IRI were performed. Portal blood sampling was effective even for a case which was negative in image diagnostic procedures. Furthermore, simultaneous monitoring of plasma glucose and serum IRI by quick radioimmunoassay seemed to be a good guide to the completeness of resection of insulin producing tumors.

Adenoma, Islet Cell↗
PubMed1985

Alterations of adrenergic systems in thyroid slices from patients with Graves' disease.

The responses to TSH of tissue cAMP levels in thyroid slices from patients with Graves' disease were significantly lower than those in normal thyroid slices. Conversely, tissue cAMP levels in thyroid slices from these patients were greatly increased by beta-adrenergic agonists, either isoproterenol or norepinephrine compared with those in normal thyroid slices. The elevation of cAMP levels induced by TSH in normal thyroid slices was significantly reduced by norepinephrine via alpha-adrenergic action as reported previously in canine thyroid slices, while such an elevation by TSH of cAMP levels in slices of Graves' disease thyroids was not inhibited, or rather increased by norepinephrine. These results indicate that, in addition to low responses to TSH, alpha- and beta-adrenergic systems were functionally altered in thyroid tissues of patients with Graves' disease.

Adrenergic alpha-Antagonists↗
PubMed1985

[Recent advances in mammographic diagnosis with respect to its technical aspects].

Technological advance has made remarkable improvements in image quality in the field of X-ray mammography which ensure to successful management of breast cancer in Japan. We convince simple mammographic technique is the state of arts in early detection of the curable breast cancer, however, attempts for further progress with respect to technology and its medical applications should be performed. Our fundamental and clinical works on this theme were presented here.

Breast Neoplasms↗
PubMed1983

Effects of substance P on thyroidal cyclic AMP levels and thyroid hormone release from canine thyroid slices.

A neuropeptide, substance P (1-50 microM) caused a prompt but transient rise in tissue cyclic AMP levels and also increased the release of thyroid hormones from canine thyroid slices. While norepinephrine markedly inhibited the stimulation by TSH of such parameters as reported previously, substance P had no effect. These results suggest that substance P may play a regulatory role in thyroid gland functions in a manner different from norepinephrine.

Animals↗