Biomedical subjects

Y Kida

Publications and source records attributed to Y Kida.

At least 73 records · Page 4Linked to original sources

PubMed1996

TIMP1 and adverse prognosis in non-small cell lung cancer.

The tumor inhibitor of metalloproteinase (TIMP) family is a natural inhibitor of several matrix metalloproteinase enzymes which are involved in the process of tumor cell invasion through the extracellular matrix. The aim of this study was to examine TIMP1 RNA expression levels in relation to the clinicopathological features in resected primary non-small cell lung cancer (NSCLC). Total cellular RNA, obtained from 45 cases of NSCLC and adjacent normal lung tissue, was examined using Northern blot analysis. TIMP1 RNA expression levels were heterogeneous in NSCLC but was significantly higher in the adenocarcinoma compared to the squamous cell carcinoma subtype. Although the TIMP1 RNA levels did not correlate with sex, smoking, tumor, node, or TNM stage, there was a statistically significant survival disadvantage for cases with relatively high TIMP1 RNA expression, suggesting a role for TIMP1 in determining the prognosis of resected NSCLC.

Adult↗

PubMed1995

Loss of heterozygosity frequently affects chromosome 17q in non-small cell lung cancer.

Although the short arm of chromosome 17, which contains the p53 gene, is frequently affected by loss of heterozygosity (LOH) in lung cancer, little is known about similar changes on the long arm. We found that LOH affected one or more of six loci along chromosome 17 in 59% of 102 informative non-small cell lung cancer (NSCLC) cases. Specifically, the frequency of LOH at 17q was 42%, approaching that at 17p (54%), and two distinct 17q regions were implicated. LOH at D17S4 on 17q was more frequent in adenocarcinomas than in squamous cell carcinomas, whereas squamous cell carcinomas had more LOH at 17p than at 17q, findings that indicate molecular genetic heterogeneity between the major NSCLC subtypes. In addition, LOH at 17q correlated with higher T stages and a significantly worse prognosis. In comparison, 25% of cases had mutations of p53 exons 5-8 but these were not associated with stage or survival. The data suggest that independent of p53, there are important tumor suppressor gene(s) on 17q that may influence NSCLC pathogenesis, progression, and survival.

Adult↗

PubMed1995

Homozygous intragenic deletion in the WT1 gene in a sporadic Wilms' tumour associated with high levels of expression of a truncated transcript.

We have examined a panel of 21 sporadic Wilms' tumours for rearrangements in the Wilms' tumour suppressor gene, WT1. In one tumour with specific allele loss in chromosome 11p13, a homozygous deletion in the 3' end of the gene, encompassing exon 10 and the 3' untranslated region, was identified. High levels of a truncated WT1 transcript, predicted to encode a polypeptide missing the fourth zinc finger were expressed in this tumour. All other samples showed normal patterns of digestion on Southern blots. This observation confirms previous findings that large deletions in the gene occur infrequently in sporadic Wilms' tumours and that the zinc-finger region of the encoded polypeptide is critical for correct functioning of the gene.

Base Sequence↗

PubMed1995

Treatment of symptomatic AOVMs with radiosurgery.

In spite of great success in the treatment cerebral AVMs with stereotactic radiosurgery, the role of this treatment modality in angiographically occult vascular malformations (AOVMs) is not recognized. Since the installation of the Gamma-knife, we have treated 20 cases of AOVMs by radiosurgery. There were 13 males and 7 females, the age ranged from 3 to 58 years with an average age of 34.0 years. Their clinical presentations at the onset were haemorrhage in 11, convulsive seizure in 7 and progressive neurological deficits in 2. Two cases had multiple lesions. Among 20 symptomatic lesions, 14 were located supratentorially, 4 in the brain stem and 2 in the cerebellar hemispheres. Following localization with MRI and dose planning, the lesions were treated by radiosurgery and the doses ranged from 15 to 20 Gy at the margins. Follow-up studies indicate a significant control of rebleeding as well as of the convulsive seizure. Imaging studies demonstrated the shrinkage of the lesion in 3 and reduced enhancement with Gadolinium-DTPA in some others. Adverse effects, chiefly related to radiation-induced oedema, occurred in 5. But they were generally mild and well controlled by medication. Thus the preliminary results indicate a certain usefulness of radiosurgery in the treatment of symptomatic AOVMs.

Adolescent↗

PubMed1995

Radiosurgery of the metastatic brain tumours with gamma-knife.

The results of treatment of metastatic brain tumours by radiosurgery are reported. Twenty cases including lung (11), colon (5), breast (1), ovary (1), liver cancer (1) and malignant melanoma (1) were involved. Seven cases had single and 13 had multiple brain metastases. In total 55 lesions were evaluated after radiosurgery with the gamma-knife. Following localization with MR1 and dose planning, radiosurgery with marginal doses between 12 to 25 Gy (mean 18.9 Gy) was delivered. In the follow-up studies with MRI after 3 months, 29 out of 55 (52.7%) lesions showed significant shrinkage. In contrast 25 showed either no change (17) or central necrosis (8), and one was enlarged. Thus the tumour control at 3 months was 98.2%, and subsequently 96.6% at 6 months. Clinical symptoms and signs were improved in most cases, but were aggravated in four cases either by tumour recurrence or by radiation-induced oedema. Although the tumours treated with radiosurgery were well controlled, tumour recurrence in another sites occurred in 4 case, of which 3 were treated by 2nd radiosurgery with 2 successful tumour control. Complications were generally mild and transient. In summary stereotactic radiosurgery is valuable new treatment not only for solitary metastases, but also for multiple or recurrent ones.

Adult↗

PubMed1995

Effects of pyridoxalated hemoglobin polyoxyethylene conjugate and other hemoglobin-related substances on arterial blood pressure in anesthetized and conscious rats.

The effects of pyridoxalated hemoglobin polyoxyethylene conjugate (PHP) and other hemoglobin-related substances on arterial blood pressure (ABP) and heart rate (HR) were examined. Infusion of PHP and other hemoglobin-related substances elevated ABP and increased HR. The degree of the increase in ABP and HR did not differ among the groups. There were species' differences in responses to PHP. Pretreatment with various blockers did not abolish the elevation of ABP. The pretreatment of NG-monomethyl-L-arginine dose-dependently reduced the elevation of ABP but did not completely abolish it. PHP also elevated ABP in conscious rats. The magnitude of the ABP elevation was significantly smaller than in the anesthetized rats. Results indicate that inhibition of nitric oxide (NO) might be responsible in part for the elevation of ABP, and the degree of the elevation would be dependent on the degree of contribution of NO to the regulation of ABP.

Adrenergic Antagonists↗

PubMed1995

Intraarterial perfusion of the hindlimb with pyridoxalated hemoglobin polyoxyethylene conjugate solution in anesthetized dogs.

To evaluate the potential clinical usefulness of a modified hemoglobin, pyridoxalated hemoglobin polyoxyethylene conjugate (PHP), the hindlimb vascular bed was perfused with PHP solution while monitoring tissue oxygen tension (PtO2) in anesthetized dogs. The hindlimb region was perfused through the external iliac artery with a roller pump at a varying perfusion rate. PtO2 was measured using a PO2-monitoring probe inserted into the gracial muscle. After surgical preparation for perfusion, the iliac arterial flow rate was 19.9 +/- 5.6 ml/min, and baseline PtO2 was 38.4 +/- 1.3 mm Hg. Perfusion with autologous arterial blood with the pump increased PtO2 and perfusion pressure (PP) in a perfusion rate-dependent manner. Perfusion with PHP solution at 20 ml/min decreased PtO2 from the initial baseline level, but an increase in the flow rate to 40-55 ml/min restored or induced an elevation of PtO2. Results demonstrated that PHP solution can deliver oxygen to local tissue and maintain tissue oxygen tension at the same level as autologous arterial blood at a high enough flow rate.

Animals↗

PubMed1995

Hemifacial spasm in Albright's hereditary osteodystrophy with pseudopseudohypoparathyroidism and nephrogenic diabetes insipidus--case report.

A 30-year-old male with Albright's hereditary osteodystrophy, pseudopseudohypoparathyroidism, and nephrogenic diabetes insipidus presented with hemifacial spasm persisting for 2 years. This association is extremely unusual. Angiography revealed markedly tortuous carotid and vertebral arteries inconsistent with his age. Neurovascular decompression of the left vertebral artery achieved only partial resolution of the spasm.

Adult↗

PubMed1995

Subarachnoid hemorrhage of unknown origin associated with Weber-Christian disease--case report.

A 58-year-old female, who had suffered from Weber-Christian disease for 26 years, presented with subarachnoid hemorrhage. Cerebral angiography showed dilatation of the basilar tip. An operation was performed in the chronic stage. The wall of dilated basilar artery was tough, but that of the right superior cerebellar artery was very thin and three small aneurysms were found on the right middle cerebral artery. Blood levels of fibrin degradation products, plasmin-alpha 2-plasmin inhibitor complex, and thrombin-antithrombin III complex were increased. The abnormality of the coagulation-fibrinolysis system and the fragility of the cerebral arteries related to Weber-Christian disease were probably the cause of the subarachnoid hemorrhage.

Basilar Artery↗

PubMed1995

[The comparison between adult and pediatric AVMs treated by gamma knife radiosurgery].

More than 290 cases of cerebral AVM had been treated by gamma knife radiosurgery since May, 1991, among which ninety-nine cases were angiographically followed up for at least one year. Comparison of the results between adult and pediatric AVMs were made. There were seventy six adult and twenty three child cases. Intracerebral hemorrhages in their past history were found in 73.7% of adult and 91.3% of child cases respectively, and the rate of intracranial hemorrhages in the pediatric group was higher than that in the adult group. The volume of the nidus of AVM in both groups was 4.2 ml in adults and 4.8 ml in children. Grade III of the Spetzler grading system occupied about 70% of all cases and was the most common grade in both groups. Treatment was performed with a mean marginal dose of 20.0Gy in adults and 20.5Gy in children. The complete occlusion of the nidus was obtained in 45% of the adult group and 74% of the pediatric group one year after, and in 81% and 95% respectively two years after the treatment was begun. As side effects, these were two rebleedings, one radiation necrosis and one radiation-induced edema in adults. However, no side effects were observed in children. It is considered that, when using gamma knife radiosurgery, pediatric AVMs are more likely to be occluded successfully and safely than adult AVMs.

Adolescent↗

PubMed1995

[A new strategy for the treatment of jugular foramen tumors using radiosurgery].

A new treatment strategy for jugular foramen tumors using radiosurgery is reported. Six jugular foramen tumors, including 2 glomus tumors and 4 lower cranial neurinomas, were involved. Among them only one tumor was confined in the jugular foramen, but the others extended into the posterior fossa, the upper cervical portion or both. As an initial treatment, 3 cases underwent operative resection from suboccipital or transcervical route. The tumor sizes at radiosurgery ranged from 14.3 to 36.1 mm with a mean of 22.4 mm in diameter. They were treated with a marginal dose between 13 to 16.5 Gy (mean 15.6 Gy). Follow-up MRI showed an apparent tumor shrinkage in 4 and no change in 2. Central tumor necrosis was found in 4 cases, but tumor progression was never observed in the mean follow-up period of 19 months. No complication occurred during and after the radiosurgery. These results indicate that radiosurgery is effective for the control of jugular foramen tumors with acceptable risk. Large tumors extending to the upper cervical portion and posterior fossa can be treated by operative resection combined with radiosurgery.

Adult↗

PubMed1995

Bilateral microphthalmos with poor visual acuity, high hyperopia, and papillomacular retinal folds in siblings.

Ophthalmological examinations were carried out on a 4-year old girl and her 2-year-old brother who have had poor visual acuity since birth. A consanguineous relationship was found between the parents. Both children had bilateral microphthalmos, poor visual acuity, high hyperopia, and papillomacular retinal folds. No ocular coloboma or systemic abnormality was found. We believe that the ophthalmic findings in these patients are rare.

Child, Preschool↗

PubMed1994

Effects of systemic or spinal cord cooling on conductive spinal evoked potentials.

To elucidate the mechanism of alterations of spinal evoked potentials after hypothermia, the effects of systemic and local cooling on conductive spinal evoked potentials were studied in cats. Conductive spinal evoked potentials were recorded from the L1 epidural space after epidural stimulation at the T4 level and during concomitant reduction of body temperature followed by rewarming. On local cooling and rewarming of the stimulating area or the recording area, conductive spinal evoked potentials changes were also analyzed. Systemic cooling provoked an increase in latency, duration, and amplitude as the body temperature decreased. Evoked potentials were not changed by the local cooling of the stimulating area. Thus, the evoked potentials changes of the spinal cord suggest that spinal cord cooling does not influence the stimulus threshold, but may affect the interaction between the amplitude change and the duration in individual spike potentials, and produces changes in temporal dispersion.

Animals↗

PubMed1994

The early effects of gamma knife on 40 cases of acoustic neurinoma.

Early results of gamma radiosurgery on 44 cases of acoustic neurinoma were studied by follow-up MRIs and changes of neurological signs every 3 months. Mean follow-up period was 12 (3 to 20) months. Enhanced MRI revealed that the central low intensity signal area (LISA) appeared at 3 to 6 months after the treatment, which was re-enhanced at 6 to 9 months, then the tumours begun to decrease in size at 9 to 12 months, which observation was noted in 11 out of 44 cases (25%). The other tumours were unchanged in size. Regarding the side effects, facial palsy appeared in 7 cases (16%) after the treatment, of whom 3 cases have improved. Trigeminal nerve palsy was found in 3 cases (7%). Deterioration of hearing was found in 11 out of 21 cases (52%) who had hearing disturbances before treatment. The pathological study of a treated tumour at 11 months revealed that central LISA was found as complete necrosis and degeneration of tumour cells and vessels with thickening walls found at the margin of the tumour. MRI is not only useful for the dose planning of radiosurgery but valuable for the follow-up study of treated tumours.

Adult↗

PubMed1994

Stereotactic gamma radiosurgery of craniopharyngiomas.

Ten cases of solid craniopharyngioma have been treated safely and effectively by gamma knife for a mean follow-up time of 13.9 months. Gamma radiosurgery was done as an initial radiotherapy to the residual or recurrent tumor after surgery in 8 cases. One recurrent tumor from surgery and conventional radiotherapy, and another tumor without previous treatment, have also been treated. Dose planning and dosimetry were performed using both axial and coronal MRIs. The tumor had a mean diameter of 21.1 mm and volume of 6.14 cm3. The tumor was treated with a mean maximum and marginal dose of 27.6 and 14.2 Gy respectively. The dose to the optic pathways is critical and was kept as low as possible which was calculated to be < 13.0 Gy on average. As a result, marked shrinkage of the tumor in 7 and central necrosis in 3 tumors have been obtained without significant side effects.

Adult↗

PubMed1994

Incidental white matter lesions identified on magnetic resonance images of normal Japanese individuals--correlation with age and hypertension.

Incidental white matter high-intensity lesions are frequently seen on T2-weighted magnetic resonance (MR) images of the brain in older people. The incidence increases with advancing age or hypertension. Brain MR images of 59 normal individuals were examined to analyze this phenomenon. The total number of white matter high-intensity lesions correlated significantly with age (p = 0.004) or systolic blood pressure (p = 0.03). The 60- to 69-year-old group demonstrated a very close correlation of white matter lesions with systolic (p = 0.02) and diastolic blood pressure (p = 0.01), in contrast to the 50- to 59-year-old group. Hypertensive subjects in their 60s are thought to develop more white matter lesions than subjects in their 50s.

Adult↗

PubMed1994

Early changes in volume and non-enhanced volume of acoustic neurinoma after stereotactic gamma-radiosurgery.

The effectiveness of stereotactic gamma-radiosurgery for treating acoustic neurinoma was evaluated by measuring the volumes of the tumor, non-enhanced tumor, and cerebellar edema in 13 patients with acoustic neurinoma who were followed up for 9 to 15 months (median 12.7 mos) after treatment. The tumor volume and non-enhanced volume tended to reach a maximum after 6 months, and cerebellar edema volume after 9 months, then decreased gradually thereafter. Hearing loss tended to increase gradually, but involvement of the facial nerve was transient.

Aged↗

PubMed1994

[Stereotactic radiosurgery of intracranial meningiomas].

Stereotactic radiosurgery for intracranial meningiomas was attempted using a 201-source cobalt gamma knife. Forty patients bearing 42 tumors were involved in this study. Their ages ranged from 30 to 91 years, with an average of 55.1 years. The most frequent sites of origin were the parasellar and petroclival regions. The mean tumor diameter was 27.2mm and the marginal tumor dose of radiosurgery ranged from 10 to 20Gy, depending on tumor location and size. Serial imaging studies with MRI were obtained in all 40 cases, in which minor tumor shrinkage was demonstrated in 7.9%, 40.0% and 53.3% at 6, 12 and 18 months after radiosurgery respectively. Only two tumors became enlarged after the treatment. Obvious low signal intensity on MRI, indicating central tumor necrosis, was found in 32% at 12 months and 40% at 18 months. Four large tumors over 40mm in mean diameter were treated by staged radiosurgery with intervals of 1.5 to 7 months. A similar good response was able to be obtained in all 4 cases, even though they were treated with a marginal dose less than 12Gy. Symptomatic edema occurred in 5 cases (12.5%) within 12 months and required corticosteroid therapy and hyperosmotic diuresis. In conclusion stereotactic radiosurgery has proved to be an effective and relatively safe method for the treatment of intracranial meningiomas.

Adult↗