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Biomedical subjects

N Hayabuchi

Publications and source records attributed to N Hayabuchi.

At least 19 recordsLinked to original sources
PubMed1996

99mTc tetrofosmin uptake in lung cancer. A case report.

This case report describes a 71-year-old man with a lung tumor in the posterior inferior segment of the right lung, detected on a screening chest radiograph. The patient underwent myocardial imaging with 99mTc tetrofosmin and 201Tl, using single photon emission CT (SPECT), and the tumor showed intense focal uptake of the radiotracer. This observation supports the recent suggestion that 99mTc tetrofosmin may be useful for oncologic imaging of lung carcinoma, and further studies may be warranted.

Adenocarcinoma↗
PubMed1996

[Evaluation of the retrosternal space and the retrocardiac space on normal left lateral radiographs of the chest].

Left lateral chest radiographs with normal studies were evaluated in 100 Japanese (50 females and 50 males) to compare the radiolucency of the retrosternal space (RSS) with that of the retrocardiac space (RCS) and to measure the RSS. In 56 (56%) cases, the RSS was equally radiolucent to the RCS. In 40 (40%) cases, the RSS was less radiolucent than the RCS (33 of 50 females and 7 of 50 males). The difference between the sexes was statistically significant (p = 0.0001). The RSS was more radiolucent than the RCS in only 4 (4%) males. Frontal chest radiographs of 50 females were classified into one of three groups (Small, Medium, or Large) depending on the size of soft tissue opacity of the breast. The differences between the radiolucency of the RSS and RCS were statistically significant between the Small and Medium and the Small and Large groups (both p < 0.0001). The strength of the relationship between the radiolucency and body-to-fat ratio was statistically significant (p = 0.0028). Results of data comparison between females and males remained significant when adjusted for differences in body-to-fat ratio (p < 0.0001). The distance on the chest radiograph from the sternum to the most anterior aortic border (the distance of RSS) could be measured on only 37 (37%) lateral chest radiographs, and the averages and standard deviations were as follows: 2.2 +/- 0.5 in all cases, 2.0 +/- 0.5 in females, and 2.4 +/- 0.5 in males. The difference between the sexes was statistically significant (p < 0.05). In conclusion, an RSS that is more opaque (less radiolucent) than the RCS is a frequent normal finding because of the opacity of the breast and fat tissue, especially in females, and the length of the RSS is shorter in females than in males.

Adult↗
PubMed1996

[Dynamic study of the liver with helical scanning: determination of hepatic contrast enhancement in routine studies].

Helical CT makes possible imaging of the entire liver in as few as 20 seconds during a single breath hold. This method is thus superior to conventional dynamic CT. In this study, optimal late scanning time and optimal volume of contrast medium in the liver were determined with helical CT in routine studies. (1) Optimal late scanning time In 50 cases, CT images of the liver were obtained at various times following the administrations of contrast medium (1.4 ml/kg). Scanning was started at 60,90,120,150 and 180 seconds after injection. Enhancement of the liver and detection of hepatic and portal veins were best at 60 seconds, followed at 90 seconds. However, a scanning delay of 60 seconds still had an effect on the arterial phase. The optimal late scanning time was thus concluded to be at 90 seconds. (2) Optimal volume of contrast medium In 40 cases, CT images of the liver were obtained following the administration of various amounts of contrast medium (1.0 ml, 1.2 ml, 1.4 ml, 1.6 ml/kg) to determine the optimal volume. No significant difference was found between 1.6 ml/kg compared and 1.4 ml/kg of administered contrast medium. It is evident from the present data that a scanning delay of 90 seconds appears to be optimal and a contrast medium volume of 1.4 ml/kg (body weight) is best for conducting helical dynamic CT on the liver.

Female↗
PubMed1995

Indium-111 antimyosin monoclonal antibody Fab imaging in patients with cardiomyopathy.

Six patients with cardiomyopathy were imaged following intravenous injection of an indium-111 labeled monoclonal antibody directed against the heavy chain of cardiac myosin. Two patients had hypertrophic non-obstructive cardiomyopathy (HNCM), two patients had dilated cardiomyopathy (DCM), and two patients had specific heart muscle disease. One of 2 patients with HNCM and one of 2 patients with DCM had a positive antimyosin scan. The 2 patients with specific heart muscle disease manifested persistent blood pool activity of the antibody, thereby precluding interpretation of the images. The present report demonstrates that antimyosin antibody imaging may provide evidence of myocardial injury, or necrosis in some patients with cardiomyopathy.

Adolescent↗
PubMed1995

Tc-99m tetrofosmin. A new diagnostic tracer for parathyroid imaging.

A 42-year old woman with hyperparathyroidism had a CT scan that was suggestive of a small nodular lesion in the left lower neck. Tc-99m sestamibi and Tc-99m tetrofosmin parathyroid imaging were performed 10 minutes and 2 hours after tracer injection. Early imaging with Tc-99m sestamibi demonstrated thyroid and focal uptake in the left lower neck. On delayed imaging, findings suggested a parathyroid adenoma. Imaging with Tc-99m tetrofosmin demonstrated similar findings. The abnormal parathyroid gland was an adenoma.

Adenoma↗
PubMed1995

Thallium-201 in brain tumors: relationship between tumor cell activity in astrocytic tumor and proliferating cell nuclear antigen.

UNLABELLED: This study was performed to assess the relationship between 201Tl chloride uptake and brain tumor proliferation using monoclonal antibody Ki-67 and proliferating cell nuclear antigen (PCNA). METHODS: Thirty-four patients with brain tumors were studied. Serial SPECT images were recorded and thallium uptake (Tl index) and washout rates in the tumors were calculated. Imaging results were compared with those from biopsy and histology. Cell proliferation was determined by PCNA or Ki-67 monoclonal antibody staining. RESULTS: Thallium-201-chloride indices of the astrocytoma were 1.73 +/- 0.17 and 1.48 +/- 0.07 on early and delayed images, respectively. On the other hand, 201TI indices for anaplastic astrocytoma were 2.60 +/- 1.05 and 1.76 +/- 0.93 and 3.26 +/- 1.63 and 2.23 +/- 0.56 for glioblastoma. The correlation between the 201TI (delay) and Ki-67 indices for astrocytic tumor. There were no significant differences between Ki-67/PCNA indices and washout rates. CONCLUSION: There was a positive correlation between PCNA but not the Ki-67 labeling index and the 201Tl index. With the use of a noninvasive technique, 201TI index supports the PCNA index.

Astrocytoma↗
PubMed1993

[Reappraisal of the clinical usefulness of transabdominal ultrasonography for advanced colon cancer--a study of tumor detection].

We evaluated the detectability of colon cancer by using transabdominal ultrasonography (US). Fifty-three cases of proven advanced colon cancer were examined in this study. Screening by US was carried out in 27 of 53 cases and US was performed in all cases after the definite diagnosis. Lesions of the colon were examined by using a 3.5 MHz convex and 5 MHz or 7.5 MHz linear probe (Yokogawa RT-2800, RT-4600). Localized hypertrophy of the irregular wall of more than 10 mm or massive tumor without the normal layered structure was defined as colon cancer on US. The rate of detection by screening test was 52%. The detection rate by US after definite diagnosis was 75%. A high detection rate was obtained in cases with a tumor diameter of more than 4 cm. Eight of 13 cases which were not detected by the screening test were visualized by US after definite diagnosis. US examination is useful for the detection of certain extended lesions of colon cancer. With technical improvements of the examination method, it is considered that cancer in the gastrointestinal tract may be discovered early on screening tests using US.

Adult↗
PubMed1993

[Evaluation of the invasion of esophageal cancer to the aorta by cine-MR imaging].

We examined the usefulness of cine-MR imaging for evaluation of the invasion of esophageal cancer to the aorta in 12 cases. We used the technique of field echo pulse sequence. When the low intensity stripe was recognized between the tumor and the wall of aorta, we interpreted it as negative finding of the direct tumor invasion. By using this criteria, 11 of the 12 cases (92%) of the esophageal cancer for aortic wall invasion were correctly diagnosed as compared with 75% correct diagnosis by conventional MR imaging.

Aorta↗
PubMed1991

[The management of stage I lymphomas of the B-cell type with special reference to the role of radiation therapy].

Fifty-one patients with clinical stage I B-cell lymphomas were treated between 1980 and 1988. For the entire group, the actuarial 5-year survival rate and 5-year freedom from relapse rate were 78% and 64%, respectively. Primary site, tumor bulk and performance status were the prognostic factors. Twenty-three patients were intensively treated with local radiotherapy alone, because (1) they had histologically low grade (7 patients) or follicular large cell (1 patients) tumors, (2) Waldeyer's ring was the site of the primary (11 patients) or (3) the tumor was less than 4 cm in maximum diameter (4 patients). Among them, only one patient died due to lymphoma (5-year survival rate: 95%), and 19 remained disease free (5-year freedom from relapse rate: 80%). In contrast, of the remaining 23 patients treated with both radiation therapy and combination chemotherapy (VEMP or CHOP), the 5-year survival rate and 5-year freedom from relapse rate were 70% and 54%, respectively. These results suggest that high-risk patients should be treated with more aggressive combination chemotherapy as well as radiotherapy. However, low-risk patients with stage I B-cell lymphomas can be treated by local radiotherapy alone.

Adult↗
PubMed1990

[The management of stage I lymphomas of the T-cell type].

Between 1980 and 1988, we treated 68 patients with clinical stage I non-Hodgkin lymphomas. Fifteen patients had lesions classified as T-cell type lymphomas, and the remainder as B-cell type lymphomas. The actuarial 5-year survival rate was 42% for patients with T-cell type and 78% for patients with B-cell (p less than 0.03), and freedom from relapse was 25% and 67%, respectively (p less than 0.01). The main relapse sites for patients with T-cell type were extranodal (5 patients) and multiple sites (2 patients). These results suggest that patients with T-cell type lymphomas should be treated by aggressive combination chemotherapy as well as radiotherapy, even though their disease may appear to be limited to one region.

Female↗
PubMed1990

[Radiotherapy and chemotherapy in stages I and II non-Hodgkin's lymphomas of Waldeyer's ring].

Sixty-four patients with stages I and II non-Hodgkin's lymphomas (NHL) involving Waldeyer's ring treated between 1970 and 1987 were reviewed. Patients with stage II NHL were subdivided into stage II 1 (limited type) and stage II2 (advanced type) from the state of neck nodes. Stage II1 was defined as involvement of unilateral cervical nodes less than 4 cm in diameter as well as Waldeyer's ring involvement. Other stage II cases were classified as stage II2. All 17 patients with stage I NHL were treated with radiation therapy alone. Their diseases were well controlled, and none of them died of causes related to the lymphoma. Among 14 patients with stage II1 NHL, the 5-year survival rate for the 9 patients treated with radiation therapy alone was 87.5%. Until 1982, 19 of 21 patients with stage II2 NHL treated with radiation therapy alone or radiation therapy and adjuvant chemotherapy (VEMP or COPP) died within 5 years mainly of disseminated diseases. Since 1983, CHOP has been used as the main treatment as well as radiotherapy for the 12 stage II2 NHL patients. So far, only 3 of them relapsed and 2 of them died of causes related to the lymphoma. Only 1 of these 12 patients was T-cell lymphoma compared to 7 of 9 stage II2 patients before 1982. This suggests that patients with stage I and those with limited stage II can be safely treated with radiotherapy. Also aggressive chemotherapy as well as radiotherapy should be used for patients with advanced stage II NHL involving Waldeyer's ring.

Adult↗
PubMed1990

Nodular histiocytic lymphoma, emphasizing results of stage I disease treated by radiotherapy. A report of the Japan Lymphoma Radiation Therapy Study Group (JLRTG).

The records of 49 patients with nodular histiocytic lymphomas (NH) who were treated from 1972 to 1985 in hospitals belonging to the JLRTG were retrospectively reviewed. The actuarial survival rate and relapse-free survival rate of all patients after 5 years were 55.0 and 51.3%, respectively. Twenty-one patients with stage I disease had a significantly better survival rate than did 12 patients with stage II disease (P less than 0.01). Without combination chemotherapy, all 15 patients with stage I NH treated by radiation therapy were in complete remission, and 14 of them remained alive and well. Among these 15 patients, no difference in relapse was observed between patients who received involved field irradiation (1 of 6) and those who received extended field irradiation (2 of 9). Patients with stage II or more NH should be treated with intensive chemotherapy and radiotherapy, as are patients with diffuse histiocytic lymphoma (DH). However, involved field radiotherapy with careful follow-up observation may be the treatment of choice for patients with stage I NH, provided their tumors are not bulky.

Adult↗
PubMed1989

Treatment of CNS involvement of non-Hodgkin's lymphoma with short-term cerebrospinal irradiation, high-dose chemotherapy, and autologous bone marrow transplantation. A case report of a 12-year-old patient.

A 12-year-old patient with non-Hodgkin's lymphoma, who developed central nervous system (CNS) relapse, was successfully treated with the following new regimen: cerebrospinal irradiation (CSpRT), high-dose chemotherapy, and autologous bone marrow transplantation (ABMT). He received remission induction therapy comprising intrathecal methotrexate and systemic chemotherapy, followed by cranial and spinal irradiations in doses of 2,000 cGy in 10 fractions over 5 days, and 1,200 cGy in 6 fractions over 3 days, respectively. He then received chemotherapy comprising 4 infusions of 1 g/m2 cytosine arabinoside and an intravenous injection of 4 mg/kg ACNU. His bone marrow, collected and cryopreserved after the remission induction therapy, was infused immediately after the high-dose chemotherapy. The granulocyte and platelet counts reached the nadir level on days 10 and 6 after ABMT, respectively, gradually recovering to the normal level in about 1 month. Neither severe infection nor bleeding was noted during the aplastic phase. No neurological deficits have been observed for 12 months. The short-time CSpRT and high-dose chemotherapy followed by ABMT are thus demonstrated to reduce neurotoxicities and bone marrow toxicities and to produce a good therapeutic effect against CNS involvement in lymphoma.

Antineoplastic Combined Chemotherapy Protocols↗
PubMed1988

[Improved survival rates in Hodgkin's disease].

Results of treatment of 25 Hodgkin's disease patients at Kyushu University Hospital from 1981 to 1985 were reviewed. Total nodal irradiation or MOPP chemotherapy was used mainly. The actuarial 5-year survival rate, 87.2%, was significantly better than the 41.0% of 61 patients treated between 1966 and 1980 (P less than 0.01). However, 12 of the 24 patients in remission eventually relapsed. To further improve the survival rates of patients with Hodgkin's disease, technical improvements in total nodal irradiation and altering Adriamycin-containing chemotherapy protocol from MOPP chemotherapy are advisable.

Adult↗