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Biomedical subjects

T Tamura

Publications and source records attributed to T Tamura.

At least 1,153 records · Page 64Linked to original sources
PubMed1986

Effects of estradiol administration on the follicular tissue of hypophysectomized hens.

Effects of hypophysectomy and estradiol administration on the incidence of atresia and the structure of the ovarian follicles were examined in the hen. Administration of high doses (9 or 13 mg/hen) of estradiol resulted in a decrease in the number of atretic follicles. In the nonatretic follicles of the hypophysectomized and estradiol-treated hens, no structural changes were observed except for the increase in the number of lipid droplets in the cytoplasm of granulosa cells and theca interna cells. It is suggested that the decrease in estrogen content in the follicular tissues may be involved in the process of atresia.

Animals↗
PubMed1986

Effect of long-term administration of anticonvulsants on copper, zinc, and ceruloplasmin levels.

Anticonvulsant therapy is known to be associated with elevated plasma copper and ceruloplasmin levels. To investigate the effect of long-term phenytoin and/or phenobarbital administration, plasma copper, zinc, and ceruloplasmin levels were measured in two groups of patients with developmental disorders who were either living at home (study 1) or institutionalized (study 2). Plasma copper and zinc levels were measured using an atomic absorption spectrophotometric method, and ceruloplasmin levels were determined using a method measuring oxidase activity (study 1) and an immunodiffusion plate method (study 2). In both studies, the mean plasma copper and ceruloplasmin levels of the anticonvulsant groups were significantly higher than those of control groups, while the mean plasma zinc levels for the anticonvulsant and control groups were similar. Possible change in the tissue zinc/copper ratio among the patients receiving long-term anticonvulsants is discussed.

Adolescent↗
PubMed1986

Effect of high carbohydrate diet on serum gamma-glutamyl transpeptidase fraction pattern in Japanese young men.

Changes in the activity of serum gamma-glutamyl transpeptidase (gamma-GTP) and the percentage of the gamma-GTP fraction in healthy young men given a high carbohydrate diet (480-636 g/day, 80% of the total energy) for 21 days were examined. Serum total gamma-GTP activity showed no significant change in four healthy young volunteers who received high carbohydrate diet for 21 days. However, the percentage of the gamma-GTP (1) fraction increased significantly (P less than 0.01) from the basal level of 55.6 +/- 4.0% to 67.6 +/- 0.9% on day 10, and then decreased to 58.4 +/- 1.4% on day 21. When the experimental diet was replaced by usual diet, the percentage of the gamma-GTP (1) fraction returned to the same level as before the experiment. It is concluded from the results that the nutrient intake affects the percentage of gamma-GTP (1), but not the total serum gamma-GTP activity.

Adult↗
PubMed1986

A case report of synchronous small cell lung cancer and gastric cancer successfully treated with carboplatin.

A 53-year-old man complained of anorexia and abdominal distention of one month's duration. The chest X-ray demonstrated a mass in the left lung with hilar and mediastinal adenopathy and a lytic lesion in the right fourth rib. A transbronchoscopic biopsy of the mass revealed oat cell carcinoma (WHO classification). The endoscopic evaluation also revealed a gastric lesion (IIc type). Biopsy of this lesion indicated signet ring cell gastric cancer. An abdominal CT scan demonstrated multiple liver metastases. Based on these findings, the patient was diagnosed as having synchronous lung and gastric primaries, with liver and bone metastasis from lung cancer. Carboplatin (CBDCA) was administered by intravenous drip infusion of 450 mg/m2. After a second treatment with CBDCA about 3 weeks later, the patient achieved a partial response at the primary site of lung cancer as well as at the liver and bone metastases. In addition, repeat endoscopy of the stomach demonstrated a complete regression. A biopsy specimen taken by gastroscopy was negative for cancer cells. Subsequent chemotherapy for small cell lung cancer was administered with cyclophosphamide, adriamycin, and vincristine, and to date there is no evidence of recurrence. Further studies on CBDCA treatment of small cell lung cancer and gastric cancer are needed to establish the efficacy of this drug against these two histologically different cancers.

Adenocarcinoma, Mucinous↗
PubMed1986

Chemosensitivity test for human small cell lung cancer cell lines in vitro.

The in vitro response to seven chemotherapeutic drugs of three established human small cell lung cancer (SCLC) cell lines (NCI H69, H128, N231) was tested by a double soft agar clonogenic assay. Colony formation by the three cell lines was universally reduced more than 50% by continuous exposure to peak plasma concentrations of all the drugs. However by exposure to one-tenth of the peak plasma concentrations, the colony growth of H69 was reduced to 25.6% and 37.7% by etoposide and teniposide, respectively, and that of N231 was reduced to 46.7%, 39.0%, 27.5% by carboplatin, etoposide and teniposide, respectively. On the other hand colony formation by the three cell lines was not suppressed more than 50% by one-hour exposure to any of the drugs tested at one-tenth of the peak plasma concentrations. By one-hour exposure to drugs at the peak plasma concentrations, colony formation by H69, H128 and N231 was reduced more than 50% by cisplatin, etoposide, teniposide and nimustin, by adriamycin, teniposide and ACNU, and by adriamycin, etoposide, teniposide and nimustin, respectively. It was concluded that these three cell lines have similar sensitivity to seven drugs commonly used against small cell lung cancer.

Antineoplastic Agents↗
PubMed1986

Long-term survival in patients with small cell lung cancer.

Of the 66 patients with small cell lung cancer (SCLC) who were treated by combination chemotherapy with or without radiation therapy from July 1978 to December 1983 at the National Cancer Center Hospital, Tokyo, 12 (18%) survived over two years and nine (14%) have remained disease-free over three years. The two-year survival rates were compared according to the patient characteristics of sex, performance status (PS), extent of disease, histologic subtype, regimen of the initial chemotherapy and response to treatment. Sex, extent of disease and response to the initial chemotherapy were the most important prognostic factors. The prognosis for patients with liver or bone metastasis was poor. All disease-free survivors, except for two patients who were treated by surgical resection after chemotherapy, achieved complete response (CR) with chemotherapy with or without radiation therapy. Eleven of the 12 two-year survivors achieved CR. Because of the small number of patients in our study, it will be necessary to evaluate further the influence of prognostic factors in patients with SCLC in future studies.

Adult↗
PubMed1986

Effect of high carbohydrate diet on serum lactate dehydrogenase isozyme pattern in Japanese young men.

Changes in the activity of serum lactate dehydrogenase (LDH) and the serum LDH isozyme pattern in healthy young men given a high carbohydrate diet (480-636 g/day, 80% of the total energy) for 21 days were examined. Serum total LDH activity showed no significant change in four healthy young volunteers who received high carbohydrate diet for 21 days. However, the percentage of LDH-4 increased significantly (P less than 0.01) from 8.5 +/- 2.4 to 10.9 +/- 1.9% after 21 days, as did also the percentage of LDH-5 (P less than 0.01) from 5.1 +/- 1.9 to 10.7 +/- 2.9%. The percentage of M-type LDH activity increased 30% during the experiment (P less than 0.05). It is concluded from the results that the high carbohydrate intake affects the percentage of LDH-4 and LDH-5, but not the total serum LDH activity.

Adult↗
PubMed1986

Antiemetic efficacy of high-dose intravenous metoclopramide and dexamethasone in patients receiving cisplatin-based chemotherapy: a randomized controlled trial.

High-dose intravenous (IV) metoclopramide has shown efficacy with few side effects for the treatment of nausea and vomiting on the day of cisplatin administration. From November 1984 to January 1986, two randomized trials in an antiemetic study were conducted. In trial I, the antiemetic effect of a short course of high-dose dexamethasone was compared with that of high-dose metoclopramide in 29 patients with lung cancer receiving chemotherapy containing cisplatin (80 mg/m2 IV) in a randomized controlled trial. Dexamethasone was given IV at a dose of 16 mg 1/2 hr before and 8 mg, 1 1/2, 3 1/2 and 5 1/2 hr after cisplatin. Metoclopramide was given IV at a dose of 2 mg/kg, 1/2 hr before and 1 1/2, 3 1/2 and 5 1/2 hr after cisplatin. Major emetic control (0-2 episodes of vomiting) during the 24 hr after cisplatin administration was achieved in 55% (6/11) and 67% (12/18) of the patients receiving dexamethasone and metoclopramide, respectively, without serious toxicity. The duration of nausea or anorexia was similar for the two treatment groups. In trial II, the combination of metoclopramide and dexamethasone was compared with metoclopramide alone to assess the additive antiemetic effect of the two drugs in 23 patients with lung cancer receiving cisplatin at a dose of 120 mg/m2 IV in a randomized cross-over study. A major antiemetic response was observed in 27% (3/11) and 92% (11/12) of the patients receiving metoclopramide alone and metoclopramide plus dexamethasone, respectively (p less than 0.005). The duration of nausea and anorexia was similar for the two treatment groups. Patients tended to prefer the combination of metoclopramide and dexamethasone; however, the difference was not statistically significant (p = 0.14) in the small number of patients entered in this study. Despite excellent control of acute chemotherapy-induced emesis, 45% of 52 patients experienced delayed nausea and vomiting more than 24 hr after cisplatin administration even among those who had had an excellent short-term response to the antiemetic agents.

Adult↗
PubMed1986

A trial of chemotherapy for lung cancer in short-term hospitalization.

Recently the number of patients with lung cancer who receive chemotherapy has been increasing rapidly. Therefore it has become difficult to treat all patients with advanced lung cancer on the basis of accurate protocol in long-term hospitalization. Accordingly we tried to treat patients within one week in each of a number of chemotherapy protocols (short-term hospitalization) and to follow them in the outpatient department. We were able to accept 61 admissions of 38 patients for chemotherapy from June to December 1985. Thus it was possible to take care of more than three times as many patients as could be cared for by long-term hospitalization for chemotherapy. Three patients could not be discharged within one week and eight had to be readmitted because of leucopenia, thrombocytopenia, or dehydration. It was considered to be possible to decrease the number of such patients by more careful and appropriate hydration and to detect them by appropriate intervals of examination in the outpatient department. We concluded that short-term hospitalization is one of the methods which can make chemotherapy of lung cancer more effective.

Antineoplastic Combined Chemotherapy Protocols↗