Search PubMed⌕ Search

Biomedical subjects

G Becker

Publications and source records attributed to G Becker.

366 records · Page 21Linked to original sources
PubMedDate not supplied

Future strategies in external radiation therapy of renal cell carcinoma.

The advantage of external radiation therapy in renal cell carcinoma is controversial. High complication rates reported in previous trials of postoperative radiation therapy can now be avoided by using contemporary modern treatment techniques. Based on both prospective and retrospective data the following indications for adjuvant radiation therapy should be considered and tested in phase III trials: a) unresectable non-metastatic tumours (preoperative irradiation), b) incomplete resection with gross or macroscopically positive margins, c) locally advanced tumour with perinephric fat extension or adrenal invasion.

Carcinoma, Renal Cell↗
PubMedDate not supplied

Radiosurgery for the treatment of brain metastases in renal cell carcinoma.

BACKGROUND: In the treatment of brain metastases using a stereotactically modified linear accelerator it could be shown that a single dose between 15 and 25 Gy leads to partial or complete remission of so-called radioresistant metastases from melanoma and hypernephroma. Radiosurgery of brain metastases then started in centers all over the world, however, experiences with brain metastases of renal cell carcinoma are yet limited. The aim of this analysis is therefore to present the treatment results of radiosurgery of brain metastases. Furthermore, in this paper prognostic subgroups shall be defined, in order to establish guidelines for an optimal therapy strategy. MATERIALS AND METHODS: Radiosurgery means stereotactically guided high-precision irradiation methods by extremely focussing ionizing radiation within the target volume as a single dose application. The characteristic steep dose decrease allows the selective destruction of small intracranial lesions, while the surrounding brain tissue is optimally protected. Two methods, Gamma Knife and stereotactic modified linear accelerator are clinically available. RESULTS: In larger studies from different groups all over the world, local tumor control rates from 85% to 95%, recurrence rates from 6% to 15% and side effects between 3% and 15% have been attained, independent of the system used. Prognostic factors, like volume of metastases < 10 ml, applied dose > 18 Gy, one or two metastases, absence of extracranial metastases, good patient performance with a Karnofsky score > 70%, primary treatment and more than one year between primary diagnosis and brain metastases showed a trend toward improved survival. Depending on the prognostic factors the median survival after radiosurgery ranged from 6 to 12 months. Retrospective comparison of radiosurgery and surgical series suggest that both modalities attain similar results. The dose can be applied with an accuracy of 0.3 mm. DISCUSSION: Based on these experiences, brain metastases can be treated by radiosurgery, primarily in patients with one or two metastases or in combination with whole brain irradiation as a boost in patients with more than two metastases. Furthermore with radiosurgery a new treatment modality exists to re-irradiate patients who have been failed after surgery or whole brain irradiation.

Bone Neoplasms↗
PubMedDate not supplied

Vascular expression of clusterin in experimental cyclosporine nephrotoxicity.

Clusterin is a widely expressed glycoprotein, which appears to be induced during tissue damage. We have examined the expression of the clusterin gene in the kidney during the development of cyclosporine (CyA)-induced nephrotoxicity in the rat using in situ hybridization histochemistry. Female Sprague-Dawley rats (170 g) were divided into experimental or control groups and were given intraperitoneal injections of CyA (25 mg/kg) or vehicle respectively for 2, 4 and 6 weeks. Kidneys from animals sacrificed at these times were fixed in 4% paraformaldehyde and embedded in paraffin. Tissue sections were hybridized using either a sense or antisense riboprobe complementary to clusterin mRNA which was labelled with 32P-UTP. Clusterin gene expression was detected in scattered tubules in kidneys from control animals. Expression of clusterin in cortical collecting ducts of CyA-treated animals was evident at 2 weeks and increased substantially at 4 and 6 weeks. Clusterin expression was also seen in afferent arterioles, the glomerular capsule and transitional epithelium of the renal pelvis of kidney sections from rats treated with CyA for 6 weeks. No labelling above background was seen at any time with the sense probe. Renin immunostaining in afferent arterioles of kidney sections from animals treated with CyA showed a marked increase after 4 and 6 weeks of CyA treatment.

Animals↗
PubMedDate not supplied

Attitudes of young men and women to breastfeeding.

The attitudes of young men and women to breastfeeding were examined including perceived incentives and barriers to the practice in cross sectional survey and focus group discussion. The study involoved 177 (100%) fifth and final year students of both sexes and a subsample of 48 students in 6 focus groups in three post primary schools in an Irish midland town. Overall 28% reported that they themselves were breastfed. The most frequent sources of information were the media rather than home or school. A majority of girls (86%) and boys (77%) agreed that breastfeeding was the best method of feeding, but less intended the practice for their children (54%), girls being significantly less likely than boys. There were no patterns in relation to social class and lifestyle. Reasons for breastfeeding in the focus groups included its naturalness, facility of feeding and adequate nourishment. Reasons against related to embarrassment in public, but mainly related to perceived problems with the practicalities of feeding. Health promotion strategies need to reach young people before they initiate pregnancies. Skills based health education courses would be helpful and girls should be aware of the positive attitudes of boys generally.

Adolescent↗