Giant cell tumor in skeletally immature patients.

The radiographs and clinical and surgical histories of 50 skeletally immature patients with histologically verified giant cell tumor (GCT) of the long and short tubular bones were retrospectively studied to determine the prevalence, location within bone (eg, epiphysis, metaphysis), skeletal distribution, radiographic appearance, and pathogenesis of GCTs. Skeletal immaturity was determined radiographically by the presence of open epiphyses. Patients were selected from a group of 876 patients who were seen in consultation with documented GCT of the tubular bones. Approximately 5.7% of all GCTs occurred in the skeletally immature (this rate must be viewed with caution due to the selection bias inherent in any referral population). The lesions almost invariably involved the metaphysis. The tibia was the most commonly affected site, representing approximately 26% of cases. All were geographic lytic lesions, with margins ranging from sclerotic to ill defined. An expanded (widened), remodeled bone contour was frequently encountered. Approximately 56% of lesions were solid or solid with cystic change; the remaining 44% were predominantly cystic.     

Unsolicited GP advice against smoking: to give or not to give?

This article discusses whether general practitioners (GPs) should give unsolicited antismoking advice to patients who smoke. Patient preferences and GP advice-giving are discussed with particular reference to professional roles. It is suggested that giving unsolicited advice against smoking at nearly every encounter is a competitive rather than collaborative behavior. General practitioners should ascertain patients' readiness for change before offering to help produce individualized agreements of joint benefit on change. Three strategies for negotiation--bridging, trading, and logrolling--are discussed.     

Low frequency of p53 mutations observed in a diverse collection of primary hepatocellular carcinomas.

Recent studies of the p53 tumor suppressor locus (designated TP53) in primary hepatocellular carcinoma (PHC) have identified a high frequency of codon 249 mutations. Due to the geographic location from which the samples were obtained and the substitution observed, the mutation was suggested to be attributable to aflatoxin B1 (AFB1) exposure. To determine the generality of this phenomenon, we have examined PHC tissues from 107 geographically and ethnically diverse sources. The frequency of p53 gene mutations was evaluated by using PCR/restriction-digest methods, GC-clamp (G+C-rich sequence) denaturing gradient gel electrophoresis, and DNA sequencing. The mutation rate observed in tumors from high-AFB1-exposure regions (25%) was more than double the rate observed in low-exposure regions (12%) but lower than the 50% frequency previously reported. Codon 249 mutations occurred at a much lower frequency than previously reported (2 of 107 samples examined). These results suggest that changes in DNA encoding p53 may not represent primary oncogenic effects but instead represent genetic changes related to tumor progression. High AFB1 levels may facilitate the generation of these progressional changes, but not by inducing a specific p53 gene mutation at codon 249 as previously reported.     

Universal mapping probes and the origin of human chromosome 3.

Universal mapping probes (UMPs) are defined as short segments of human DNA that are useful for physical and genetic mapping in a wide variety of mammals. The most useful UMPs contain a conserved DNA sequence immediately adjoined to a highly polymorphic CA repeat. The conserved region determines physical gene location, whereas the CA repeat facilitates genetic mapping. Both the CA repeat and its neighboring sequence are highly conserved in evolution. This permits molecular, cytogenetic, and genetic mapping of UMPs throughout mammalia. UMPs are significant because they make genetic information cumulative among well-studied species and because they transfer such information from "map rich" organisms to those that are "map poor." As a demonstration of the utility of UMPs, comparative maps between human chromosome 3 (HSA3) and the rat genome have been constructed. HSA3 is defined by at least 12 syntenic clusters located on seven different rat chromosomes. These data, together with previous comparative mapping information between human, mouse, and bovine genomes, allow us to propose a distinct evolutionary pathway that connects HSA3 with the chromosomes of rodents, artiodactyls, and primates. The model predicts a parsimonious phylogenetic tree, is readily testable, and will be of considerable use for determining the pathways of mammalian evolution.     

Interleukin 9: A candidate gene for asthma

Asthma is a complex heritable inflammatory disorder of the airways associated with clinical signs of atopy and bronchial hyperresponsiveness. Recent studies localized a major gene for asthma to chromosome 5q31-q33 in humans. Thus, this segment of the genome represents a candidate region for genes that determine susceptibility to bronchial hyperresponsiveness and atopy in animal models. Homologs of candidate genes on human chromosome 5q31-q33 are found in four regions in the mouse genome, two on chromosome 18, and one each on chromosomes 11 and 13. We assessed bronchial responsiveness as a quantitative trait in mice and found it linked to chromosome 13. Interleukin 9 (IL-9) is located in the linked region and was analyzed as a gene candidate. The expression of IL-9 was markedly reduced in bronchial hyporesponsive mice, and the level of expression was determined by sequences within the qualitative trait locus (QTL). These data suggest a role for IL-9 in the complex pathogenesis of bronchial hyperresponsiveness as a risk factor for asthma.     

Challenges for District Health Boards as needs assessors

DHBs face the foregoing challenges in the current and future environment, as they take on democratic representation for the population, particularly in health needs assessment, consultation, prioritization and health service purchasing. Need and objectives must be clearly defined at an early stage in the context of resource constraints and timeframes that will challenge the ability of Boards to conduct needs assessments. Consultation with the community and other, expert groups must inform needs assessments. But it is not clear how the prioritization process will work, particularly regarding the ability of local agendas for purchasing of health services that complement the national agenda. Recent health crises have shown that DHBs, without Government support, cannot easily meet such challenges in the new decentralised environment. Consideration must therefore be given to how these identified challenges for DHBs as needs assessors can best be met.     

Reasons for poor understanding of when and how to access GP care for childhood asthma in Auckland,New Zealand

BACKGROUND: Attempts to explain why some patients lack the understanding needed to access GP care for childhood asthma are uncommon and have tended to be based on reported statistical associations. OBJECTIVES: The aims of this study were to describe and account for poor patient understanding of when and how to access GP care for childhood asthma in Auckland, New Zealand. METHODS: A general inductive approach was used to analyse 29 semi-structured, personal interviews, during March-May 2001, with Auckland key informants selected through maximum variation sampling. Informant checking and the literature supported the text analysis by two independent researchers. RESULTS: Key informants reported wide variations in the extent to which guardians and asthmatic children understand when and how to access GP services. Two sets of barriers to patient understanding were identified. The first limits the willingness of people to seek understanding and the second limits their ability to understand, even if they want to understand. CONCLUSIONS: Use of qualitative methodology was able to reveal barriers to patient understanding. Strategies operating at the GP and system levels were identified to help overcome these barriers.     

Is There Any Ideal of ‘High Quality Care’ Opposing ‘Low Quality Care’? A Deconstructionist Reading

The expressions ‘high quality care’ and ‘low quality care’ are cognitive and linguistic artefacts that help to structure people’s lives and thinking; for example, moves are now afoot internationally to pay bonuses to health professionals for delivering high quality care. United States programmes, most conspicuously, are assuming that high quality care can be validly distinguished from low quality care, and incentivised through bonuses. This distinction is always at least implicit, for high quality care has no meaning without low quality care. Through a ‘deconstructionist reading,’ this article discusses limitations of categorising the quality of care as either high or low. The limitations of this ‘binary opposition’ can include a lack of defining attributes; vagueness and fuzziness at the ‘boundaries’ between high quality care and low quality care; concealment of quality as a continuum; and use of the binary opposition to effect social order and control. Health policy implications of our analysis are discussed. Drawing upon the general medical services contract in the United Kingdom, we suggest an approach to overcoming the oversimplification and imprecision that categorisation tends to produce.