Cytogenetic instability, predominantly involving chromosome 1, is characteristic of elastofibroma

Elastofibroma, an unusual pseudotumor composed of excessive collagen and abnormal elastic fibers, has rarely been subjected to cytogenetic analysis. Only two cases have been previously defined, both of which demonstrated nonclonal abnormalities. In the present study, three cases of elastofibroma were cytogenetically analyzed. Abnormalities of the short arm of chromosome 1 were seen in all three cases (either clonally or as the most frequently involved region among nonclonal aberrations). In addition, a translocation involving chromosomes 8 and 12 was detected as a clonal rearrangement in one of the three cases. The observation of clonal abnormalities in elastofibroma suggests that this lesion may represent a neoplastic rather than a reactive process.

Meta-analysis of tympanostomy tube sequelae

OBJECTIVE

To estimate the incidence of tympanostomy tube sequelae based on systematic review of published case series and randomized studies.

DATA SOURCES

English-language MEDLINE search from 1966 through April 1999 with manual reference search of proceedings, articles, reports, and guidelines.

STUDY SELECTION

Cohort studies with otitis media as the primary indication for tube placement.

DATA EXTRACTION

Two reviewers independently extracted data from 134 articles.

DATA SYNTHESIS

Transient otorrhea occurred in 16% of patients in the postoperative period and later in 26%; recurrent otorrhea occurred in 7.4% of patients and chronic otorrhea in 3.8%. Sequelae of indwelling tubes included obstruction (7% of ears), granulation tissue (5%), premature extrusion (3.9%), and medial displacement (0.5%). Sequelae after tube extrusion included tympanosclerosis (32%), focal atrophy (25%), retraction pocket (3.1%), cholesteatoma (0.7%), and perforation (2.2% with short-term tubes, 16.6% with long-term tubes). Meta-analysis showed that long-term tubes increased the relative risk of perforation by 3.5 (95% CI, 1.5 to 7.1) and cholesteatoma by 2.6 (95% CI, 1.5 to 4.4). Similarly, intubation increased the relative risk of tympanosclerosis by 3.5 (95% CI, 2.6 to 4.9) and focal atrophy by 1.7 (95% CI, 1.1 to 2.7) over nonintubated control ears (baseline tympanosclerosis and atrophy rates of 10% and 14%, respectively).

CONCLUSIONS

Sequelae of tympanostomy tubes are common but are generally transient (otorrhea) or cosmetic (tympanosclerosis, focal atrophy). Nonetheless, the high incidence suggests a need for ongoing otologic surveillance of all patients with indwelling tubes and for a reasonable time period after tube extrusion. Long-term tubes should be used on a selective and individualized basis.

Metabolic, psychological, and health correlates of dietary restraint in healthy postmenopausal women

BACKGROUND

Dietary restraint, a term used to describe the intentional control of food intake to prevent weight gain or promote weight loss, is commonly practiced by older adults, but little is known about its effects on physiology and metabolism.

METHODS

We therefore compared a wide range of parameters between groups of healthy non-obese postmenopausal women classified psychometrically as unrestrained eaters (body mass index [BMI] 23.8 +/- 0.6 [SEM] kg/m(2), n = 28) or restrained eaters (BMI 24.5 +/- 0.5, n = 39). Measurements were made of reported micronutrient intakes, cardiopulmonary function, hematology, body temperature, skin thickness, bone mass, and immune function; in addition, self-perceived health, mood, and some dimensions of eating behavior were assessed by questionnaire.

RESULTS

Macronutrient and micronutrient intakes were not significantly different between restrained and unrestrained eaters reporting energy intake to within 30% of predicted total energy expenditure. Restrained eaters had significantly lower hemoglobin (12.9 +/- 0.1 [SEM] vs 13.2 +/- 0.1 g/dl; p <.05), but values were within the normal range in both groups. In addition, restrained eaters scored significantly higher on the Eating Attitudes Test (p <.01) and drive-for-thinness (p <.001) and maturity fears (p <.05) subscores of the Eating Disorders Inventory, but values were again within the normal range. No other parameter differed significantly between groups.

CONCLUSIONS

In this normal-weight population, restrained eating was not associated with detrimental effects in a wide range of physiological, metabolic, and health characteristics. Further work is needed to determine the relevance of these results to the general population.

Genotyping fetal DNA by non-invasive means: extraction from maternal plasma

BACKGROUND AND OBJECTIVES

Identification of fetal DNA in maternal plasma may allow genetic analysis without the use of invasive techniques. The aim of this study was to extract DNA from maternal plasma, identify fetal material through the presence of SRY or RHD gene sequences and assess the reliability of these results.

MATERIALS AND METHODS

A polymerase chain reaction (PCR) method of a commercial kit was used with primers for SRY or exon 10 of the RHD gene sequence.

RESULTS

Multiple plasma samples were collected from 60 women who were evaluable for either SRY or RHD, or both, fetally derived DNA sequences. Fetal DNA was present in the plasma throughout the pregnancies and for some hours or days after delivery.

CONCLUSION

Fetal DNA can be reliably detected in maternal plasma from early in pregnancy and normally is cleared within days of delivery.

A systematic review of predictors of maintenance of normotension after withdrawal of antihypertensive drugs

BACKGROUND

The identification and treatment of hypertension in the general community has contributed to the reduction in strokes and coronary heart disease observed during the past 30 years. However, concerns have arisen that some patients may be receiving unnecessary antihypertensive drug therapy leading to wasted resources and the potential for adverse drug effects. Once therapy has been started, treating physicians have difficulty in selecting patients for withdrawal and have concerns regarding patient safety and their own legal liability.

PROCEDURES

This study reviews and consolidates information from published studies to identify known predictors of the successful maintenance of normotension after antihypertensive drug withdrawal. The predictors were identified by determining the proportion of subjects with various baseline characteristics who remained normotensive while off medication for at least 12 months. From these data we have developed a clinical algorithm to help identify patients in whom antihypertensive drug withdrawal might be considered. This may assist primary care physicians in achieving successful withdrawal of antihypertensive therapy among selected hypertensive patients.

RESULTS

The most consistent predictors identified were blood pressure (BP) (lower pretreatment, on treatment, and after withdrawal), nature of pharmacotherapy (fewer agents and lower dose), and preparedness to accept dietary intervention (weight and sodium reduction).

CONCLUSIONS

On the basis of this information, a trial of withdrawal of antihypertensive medication might be recommended for patients who have mildly elevated, uncomplicated BP that is well controlled on a single agent, and who are motivated and likely to accept lifestyle changes.

Mesenchymal stem cells are capable of homing to the bone marrow of non-human primates following systemic infusion

OBJECTIVE

The human bone marrow contains mesenchymal stem cells capable of differentiating along multiple mesenchymal cell lineages. Using a non-human primate model, we sought to determine whether the systemic infusion of baboon-derived mesenchymal stem cells was associated with toxicity and whether these cells were capable of homing to and persisting within the bone marrow.

MATERIALS AND METHODS

Five baboons (Papio anubis) were administered lethal irradiation followed by intravenous autologous hematopoietic progenitor cells combined with either autologous (n = 3) or allogeneic (n = 2) mesenchymal stem cells that had been expanded in culture. In four of these baboons, the mesenchymal stem cells were genetically modified with a retroviral vector encoding either the enhanced green fluorescent protein gene (n = 3) or the human placental alkaline phosphatase gene (n = 1) for tracking purposes. A sixth animal received only intravenous gene marked autologous mesenchymal stem cells but no hematopoietic stem cells or conditioning irradiation.

RESULTS

Following culture, baboon mesenchymal stem cells appeared morphologically as a homogeneous population of spindle-shaped cells that were identified by the monoclonal antibodies SH-3 and SH-4. These cells did not express the hematopoietic markers CD34 or CD45. Baboon mesenchymal stem cells isolated from primary culture were capable of differentiating along both adipogenic and osteogenic lineages. There was no acute or chronic toxicity associated with the intravenous infusion of mesenchymal stem cells. In all five recipients of gene marked mesenchymal stem cells, transgene was detected in post-transplant bone marrow biopsies. In two animals receiving autologous mesenchymal stem cells, including the one non-conditioned recipient, transgene could be detected over 1 year following infusion. In one recipient of allogeneic gene marked mesenchymal stem cells, transgene was detected in the bone marrow at 76 days following infusion.

CONCLUSION

These data demonstrate that baboon mesenchymal stem cells: 1) are not associated with significant toxicity when administered intravenously, 2) are capable of homing to the bone marrow following intravenous infusion, and 3) have the capacity to establish residence within the bone marrow for an extended duration following systemic administration.

Choroid plexus tumors in children: significance of stromal invasion

OBJECTIVE

A group of choroid plexus tumors fit the cellular criteria for choroid plexus papilloma (CPP) except for invasion into the adjacent parenchyma, with associated loss of the normal villus architecture at the site of invasion. These tumors retain a benign cellular appearance. In the existing literature, it is unclear whether these tumors are classified as choroid plexus carcinomas or as CPPs. In our experience, although evidence of invasion is present, these tumors tend to exhibit benign behavior. We suggest that stromal invasion of this type remains consistent with a benign clinical course, although surgical results may demonstrate higher morbidity rates, given the invasive nature of the tumors. The failure to classify these tumors as CPPs may explain some of the variability in outcomes reported for various studies.

METHODS

To study this question, clinical and histological data for children diagnosed with CPPs (either with or without stromal invasion) between 1985 and 1995 were examined. Only cases with pre- and postoperative magnetic resonance imaging data were included in the series.

RESULTS

A total of 12 patients with CPPs were identified, with 4 tumors being notable for stromal invasion. After gross total tumor removal, none of the eight children with CPPs received adjuvant therapy at our institution; all are alive without evidence of tumor recurrence after surgical excision (mean, 108 mo). Of the four patients with stromal invasion, three underwent gross total resection. The one patient who underwent subtotal resection received chemotherapy at another facility. All four of these patients are alive, after a mean of 100 months of follow-up monitoring.

CONCLUSION

It is recommended that CPPs with a benign cellular appearance but with evidence of local parenchymal invasion and loss of the normal villus architecture at the site of invasion be classified as CPPs. Patients with these tumors respond to surgical therapy alone, without the need for adjuvant treatment.

Keratin 23 (K23), a novel acidic keratin, is highly induced by histone deacetylase inhibitors during differentiation of pancreatic cancer cells

Sodium butyrate (NaBu) was shown to induce differentiation and apoptosis in the human pancreatic cancer cell line AsPC-1. A suppression subtractive hybridization-based technique was used to identify genes induced by NaBu. A novel cDNA was found to be highly up-regulated in AsPC-1 cells in response to NaBu. The gene expresses a 1.65-kb mRNA encoding a protein with an open reading frame of 422 amino acids. It has an intermediate filament signature sequence and extensive homology to type I keratins. Sequence comparison with known keratins indicated that the gene shares 42-46% amino acid identity and 60-65% similarity within the alpha-helical rod domain. The gene is named K23 (for human type I Keratin 23, KRT23). K23 mRNA was highly induced by NaBu in different pancreatic cancer cells. Trichostatin A (TSA), a potent and specific inhibitor of histone deacetylase, similarly induced K23 mRNA expression. Treatment with either actinomycin D or cycloheximide efficiently blocked the induction of K23 mRNA by NaBu/TSA. These results indicate that K23 mRNA induction by NaBu or TSA is a downstream event of histone hyperacetylation. We also demonstrated that expression of p21(WAF1/CIP1) antisense RNA efficiently blocked the induction of K23 mRNA induced by NaBu. Our results suggest that K23 is a novel member of the acidic keratin family that is induced in pancreatic cancer cells undergoing differentiation by a mechanism involving histone hyperacetylation. p21(WAF1/CIP1) serves as an important mediator during the induction process of K23 by NaBu.

Nursing student residency program: a model for a seamless transition from nursing student to RN

It takes a relatively long time for new nursing graduates to become oriented and comfortable with work routines on the nursing unit. To address the problem, the authors formed a partnership among three educational programs and three hospitals. This article describes a 900-hour residency program for senior baccalaureate nursing students to ease their transition into the role of beginning-level staff nurse in an acute-care setting. The benefits to the hospitals were decreased orientation time, less turnover in staff (50% at 2 years), and lower recruitment costs.

Inhibition of mitotic cyclin B and cdc2 kinase activity by selenomethionine in synchronized colon cancer cells

Selenomethionine (SeMet), an organic selenium compound, has been demonstrated to have significant chemopreventive activity. However, the mechanism of action of SeMet has yet to be identified. Previously, our laboratory found that treatment of cells with SeMet induced apoptosis and altered the cell cycle. These observations have led to further analysis of the cell cycle effects of SeMet in colon cancer cells. Synchronized HCT 116 colon cancer cells treated with 100 microM SeMet for 66 h were found to have a transient delay in G2/M phase of the cell cycle at 18 and 24 h after treatment. With this was observed an inhibition of cell growth. Coincidentally with this delay was a decrease in mitotic cyclin B RNA expression at 18 h after treatment. In addition, the cdc2 kinase activity of HCT 116 cells was decreased at 18 h. Morphological studies indicate an increase in the number of treated cells (45%) undergoing apoptosis at 66 h compared to control cells (27%). These studies demonstrate that modulation of mitotic cyclin expression and cdc2 kinase activity play a role in the ability of SeMet to inhibit tumor cell growth. A consequence of this prolonged arrest is apoptosis.

"Living off the land": resource efficiency of wetland wastewater treatment

Bioregenerative life support technologies for space application are advantageous if they can be constructed using locally available materials, and rely on renewable energy resources, lessening the need for launch and resupply of materials. These same characteristics are desirable in the global Earth environment because such technologies are more affordable by developing countries, and are more sustainable long-term since they utilize less non-renewable, imported resources. Subsurface flow wetlands (wastewater gardens(TM)) were developed and evaluated for wastewater recycling along the coast of Yucatan. Emergy evaluations, a measure of the environmental and human economic resource utilization, showed that compared to conventional sewage treatment, wetland wastewater treatment systems use far less imported and purchased materials. Wetland systems are also less energy-dependent, lessening dependence on electrical infrastructure, and require simpler maintenance since the system largely relies on the ecological action of microbes and plants for their efficacy. Detailed emergy evaluations showed that wetland systems use only about 15% the purchased emergy of conventional sewage systems, and that renewable resources contribute 60% of total emergy used (excluding the sewage itself) compared to less than 1% use of renewable resources in the high-tech systems. Applied on a larger scale for development in third world countries, wetland systems would require the electrical energy of conventional sewage treatment (package plants), and save of total capital and operating expenses over a 20-year timeframe. In addition, there are numerous secondary benefits from wetland systems including fiber/fodder/food from the wetland plants, creation of ecosystems of high biodiversity with animal habitat value, and aesthestic/landscape enhancement of the community. Wetland wastewater treatment is an exemplar of ecological engineering in that it creates an interface ecosystem to handle byproducts of the human economy, maximizing performance of the both the natural economy and natural ecosystems. Wetland systems accomplish this with far greater resource economy than other sewage treatment approaches, and thus offer benefits for both space and Earth applications.

Diagnosis and management of male breast enlargement in patients with HIV/AIDS

There have been several recent reports describing gynecomastia in HIV-1-seropositive patients treated with HAART. However, the etiology of gynecomastia in this setting is far from clear. In this article, we describe the main issues in diagnosis and treatment of gynecomastia and stress the importance of differentiating between "true" gynecomastia and "lipomastia" (pseudogynecomastia), characterized by subcutaneous fat deposition. The importance of switching antiretroviral drugs is also discussed. In addition, newer medical therapies are highlighted.

Blood-brain phenylalanine relationships in persons with phenylketonuria

OBJECTIVES

Clinicians caring for persons with phenylketonuria (PKU) have been perplexed by the occasional normal individual with the classical biochemical profile consistent with the diagnosis of PKU. Usually untreated subjects with the biochemical profile of blood phenylalanine (Phe) levels >1200 micromol/L are severely mentally retarded and may have neurological findings. Preliminary reports have recently appeared suggesting that low brain Phe levels, in comparison with elevated blood Phe levels, account for the occurrence of these occasional unaffected individuals with the biochemical profile consistent with PKU.

METHOD

Magnetic resonance imaging/magnetic resonance spectroscopy was used to measure brain Phe content compared with simultaneously obtained blood Phe levels determined on the amino acid analyzer. This comparison was obtained in 5 normal non-PKU persons, 4 carriers of the gene causing PKU, and in 29 individuals with the proven form of the disorder.

RESULTS

Blood-brain measurements in 5 normal persons ranged from.051 to.081 mmol/L, with a mean of.058 mmol/L. Their simultaneously measured brain levels of Phe ranged from.002 to.15 mmol/L, with a mean of.09 mmol/L. Similar measurements were obtained in 4 carriers of the gene causing PKU. Their blood levels varied between.068 and.109 mmol/L, with a mean of.091 mmol/L and simultaneously obtained brain levels of Phe varied between.06 and.21 mmol/L, with a mean of.11 mmol/L. Twenty subjects with a mean IQ of 104 exhibited a mean blood level of 1.428 mmol/L and a simultaneous mean brain level of.23 mmol/L, whereas 9 persons with a mean IQ of 98.7 exhibited a mean blood Phe level of 1.424 and a mean brain Phe level of.64 mmol/L. The correlation between blood and brain levels was not significant.

CONCLUSION

In usual cases, intellectually normal persons who have never been treated but who have a biochemical profile consistent with classical PKU exhibit lower brain levels of Phe. Such individuals are exceptional and may not need the vigorous restriction of their blood Phe levels that is required by the majority of persons with PKU.

The use of D-dimers in the diagnosis of occult pulmonary emboli in HIV pulmonary disease--two case reports

Pulmonary thromboembolism is not considered a common cause of morbidity in HIV disease. Although anti-phospholipid antibodies are often seen in HIV disease, they are not associated with an increased thrombotic risk. Computed tomographic (CT) pulmonary angiography has been described as the imaging modality of first choice, as abnormal baseline chest X-rays may reduce the diagnostic utility of ventilation perfusion (VIQ) scanning. In HIV-negative individuals D-dimer testing has been shown to be a good screening tool in suspected pulmonary embolism. We present 2 cases where the diagnosis of pulmonary embolus was established using tests for the clotting degradation products D-dimers.

Fruit and vegetable availability among ten European countries: how does it compare with the 'five-a-day' recommendation? DAFNE I and II projects of the European Commission

Recasting the role of fruit and vegetables (F&V) in the diet, and planning national and international campaigns to enhance their consumption are major public health service objectives. The present study seeks to describe F&V availability patterns in ten European countries and examine compliance with current recommendations. The mean and median F&V availability (g/person per d) was estimated based on household budget survey data retrieved from the Data Food Networking (DAFNE) databank. Low F&V consumers were identified based on WHO international recommendations (minimum combined F&V intake of about 400 g/person per d) and current conservative guidelines of a minimum daily intake of three portions of vegetables and two portions of fruit. Considerable disparities in F&V availability were found among the surveyed European populations. Only in Mediterranean countries did the mean daily population intake clearly exceed combined F&V recommendations. Dietary patterns were positively skewed in all populations studied, on account of the presence of exceptionally high values among segments of the populations. Moreover, the correlation was unexpectedly weak between the proportion of low fruit and low vegetable consumers (Spearman's correlation coefficient +0.18). More than 50% of the households in the surveyed populations are likely to consume less than the recommended daily vegetable intake of three portions, and this applies even to the two Mediterranean populations. The efficiency of F&V promoting strategies may be enhanced if F&V are addressed separately; furthermore, interventions that would specifically focus on vegetables are probably needed.

Expression and function of striatal nAChRs differ in the flinders sensitive (FSL) and resistant (FRL) rat lines

Rats of Flinders Sensitive (FSL) and Flinders Resistant lines (FRL) differ in their susceptibility to physiological and associated behavioral responses elicited by nicotine. In the present study, we measured dopamine (DA) content in striatal dialysates to investigate the sensitivity of FSL and FRL rats to nicotine delivered locally through a microdialysis probe placed in the striatum. We also measured the expression density of striatal high-affinity nicotinic acetylcholine receptors (nAChRs), and that of mRNAs encoding for alpha3, alpha4, alpha7 and beta2 nAChR subunits in both lines. The DA content of dialysates was measured before and after a 1-min perfusion of nicotine (6, 10 or 20 nmoles/min) and the resulting DA increase was taken as a measure of the alkaloid's intrinsic activity for nAChRs involved in the release of DA. The nicotine-induced increase of striatal DA release was greater in FSL than in FRL rats for all concentrations of nicotine, suggesting that the intrinsic activity of nicotine was greater in the FSL than in the FRL rats. This was further supported by our finding that the density of high-affinity nAChRs in the striatum of FSL rats was 44% greater than in the FRL rats, whereas affinity (K(D)) was virtually the same in the two lines of rats. Also the expression of mRNAs encoding for alpha(4), alpha(7), and beta(2) subunits in the striatum was greater in FSL than in FRL rats (attomol/microg total RNA, alpha(4):98+/-10 vs. 77+/-7; alpha(7):279+/-16 vs. 184+/-16; beta(2):310+/-19 vs. 201+/-12). We hypothesize that the difference in nicotine-induced DA release in the striatum of FSL and FRL rats depends on the difference in nAChR subunit expression in the striatum between the two lines. The Flinders rats could be used as a model for nicotine self-administration studies to evaluate the susceptibilities of FSL and FRL rats to nicotine dependence.

Interleukin 10-induced thrombocytopenia in normal healthy adult volunteers: evidence for decreased platelet production

Recombinant human interleukin 10 (rhuIL-10) inhibits the production of proinflammatory cytokines and has shown promise in the treatment of inflammatory bowel disease. Clinical trials have been accompanied by a reversible decline in platelet counts. We conducted a randomized, double-blinded, placebo-controlled, parallel group trial in 12 healthy volunteers to investigate the aetiology of rhuIL-10-induced thrombocytopenia. Eight volunteers received 8 microg/kg/d of rhuIL-10 subcutaneously, while four subjects received a placebo alone for 10 d. A reversible decline in the platelet counts from a mean of 275 x 10(9)/l to 164 x 10(9)/l was observed in the IL-10-treated cohort (P = 0.012). A fall in the haemoglobin mean levels was also observed in the IL-10-treated cohort from 13.7 to 11.7 g/dl (P = 0.011). No significant change was observed in the bone marrow cellularity or myeloid/erythroid ratio or in the number of megakaryocytes per high-powered field (HPF). A fall was observed in the number of megakaryocyte colony-forming units (CFU-MKs) after the administration of IL-10 compared with those receiving the placebo (P = 0.068). No difference in the change in granulocyte-macrophage CFUs (CFU-GMs), mixed lineage CFUs (CFU-GEMMs) or erythroid burst-forming units (BFU-Es) was observed when comparing the IL-10- vs. placebo-treated groups (P > 0.465). Serum cytokine levels of thrombopoietin (TPO). IL-6 and granulocyte-macrophage colony stimulating factor (GM-CSF) were not decreased following IL-10 administration. In fact, both TPO and GM-CSF appeared to be slightly increased in the serum. All subjects underwent In111-labelled platelet survival studies with liver/spleen scans to assess splenic sequestration prior to and then on day 7 of treatment. A significant reduction in splenic sequestration of platelets (P =0.012) was observed in the IL-10-treated group, but not in the placebo-treated subjects.

A flow-cytometric equivalent of the Kleihauer test

BACKGROUND AND OBJECTIVES

The Kleihauer slide test is in general use to screen obstetric patients for possible fetomaternal haemorrhage. Since 1993, Rh(D)-negative patients have been tested in our laboratory by a flow-cytometric method detecting Rh(D)-positive fetal cells, a method which offers improved sensitivity and accuracy. We report another flow-cytometric method of broader application which quantitates cells according to haemoglobin F (HbF) content.

MATERIALS AND METHODS

The red cells are fixed with glutaraldehyde and permeabilized by exposure to Triton X-100. A polyclonal sheep antibody to HbF is incubated with the cells followed by a fluorescein-labelled anti-sheep antibody.

RESULTS

Quantitation of the percentage of fetal cells following a FMH can be achieved irrespective of the blood groups of either mother or infant, and the presence of maternal F cells need not interfere since the intensity of staining is usually less than that of fetal cells. Two of 19 transfusion-dependent patients with beta-thalassaemia have been found to have red cells indistinguishable from fetal cells on the basis of HbF content, but these patients also have been found to give positive results by the Kleihauer test.

CONCLUSIONS

The flow-cytometric method may serve to replace the traditional Kleihauer test since it appears to offer improved accuracy and objectivity.

Absence of association between individual thymidine analogues or nonnucleoside analogues and lipid abnormalities in HIV-1-infected persons on initial therapy

Changes in levels of triglycerides and cholesterol during antiretroviral therapy raise concerns regarding an increased future risk of atherogenic disease and may precede the appearance of fat redistribution. Hypotheses regarding the impact of nucleoside analogues on adipocytes provide a possible explanation for metabolic and clinical fat disturbances. It is unclear whether the choice of nucleoside analogue combination or coadministration of nonnucleoside agents influences change in lipids. We performed a cross-sectional analysis of 135 persons receiving their first nucleoside analogue plus nonnucleoside-based combination antiretroviral regimen for at least 1 month and for whom cholesterol and triglyceride values were available on therapy. Univariate and multivariate regression models were used to explore the relation between cholesterol and triglycerides, as continuous variables with other variables. Both significant and nonsignificant variables from univariate analyses were evaluated in multivariate models to limit possible confounders. No association with drug choice was observed, either when comparing thymidine analogues (stavudine or zidovudine), all nucleoside analogue combinations or choice of either efavirenz or nevirapine as nonnucleoside. Age and triglyceride levels were found in a multivariate analysis to be associated with higher cholesterol. Only higher cholesterol was associated with higher triglyceride levels. In conclusion, no differences were observed between choice of drug or combination on cholesterol or triglyceride values during therapy. Older individuals may be more likely to have elevated cholesterol values.

Effect of photodynamic therapy on recurrent pituitary adenomas: clinical phase I/II trial--an early report

Pituitary adenomas, although histologically benign, are not always curable by surgery alone, principally because of dural infiltration, as well as their peculiar anatomical location. Radiotherapy has been employed as an adjuvant therapy to address residual disease with favourable results. This approach is, however, not without side effects, and it cannot be repeated. We are therefore investigating the effectiveness of photodynamic therapy (PDT) on recurrent pituitary adenomas in humans. This study details the protocol applied to 12 patients with recurrent pituitary adenomas, which involved systemic administration of photosensitizer (Photofrin) followed, after a period of 24-48 h, by intraoperative illumination of the tumour bed using 630 nm laser light. The primary end points were visual, endocrine and radiological improvement. The incidence of side effects was also monitored. The longest follow-up is 2 years. Most patients suffering from visual acuity or field defects have shown improvement when followed for 12 months or more. Three patients showed complete recovery of their visual fields. All those who presented with functional adenomas have shown reduction in their hormone levels. Tumour volume, relative to the preoperative size, was 122, 87, 66, 60 and 46% at 4 days, and 3, 6, 18 and 24 months, respectively. One patient developed severe skin photosensitization due to early exposure to direct sunlight and three others displayed minor skin reactions. There was no treatment-related mortality or morbidity. One patient (operated transcranially) developed hemiparesis postoperatively, which recovered completely. We think this is unrelated to the treatment. This prospective study demonstrates that PDT may be safely applied to the pituitary fossa by the trans-sphenoidal route and indicates the need for a randomized, controlled trial in order to establish its therapeutic potential.

Survey of dietetic provision for patients with diabetes

AIMS

To survey dietitians involved in diabetes care regarding the provisions for patients with diabetes.

METHODS

A national survey of 512 dietitians known to be engaged in provision of diabetes care was conducted in 1997 and 391 (76%) responded.

RESULTS

Nationally the median provision of dietetic care for diabetes reported was 10.7 h per 100,000 general population per week, but the provision was uneven ranging from 2.0 to 27.6 h per 100,000. Eighty-five per cent of dietitians worked in areas where the provision was less than 22 h per 100,000 general population per week (the current recommended minimum standard). Dietetic provision was greater in secondary care (median 9.1 h per 100,000 general population per week) than in general practice, residential homes and other locations (median 4.4 h per 100,000 general population per week). Provision was greater in those areas in which a designated dietitian had responsibility for co-ordinating the dietetic service for diabetes than in areas where the co-ordinator was not a dietitian or where there was no co-ordinator. Over 90% of dietitians reported following British Diabetic Association (BDA) recommendations regarding advice on carbohydrate, sugar, fat and fibre consumption, but only one-third routinely advised on salt restriction. Of the 17% of dietitians who continue to use carbohydrate exchanges, all combine this method with other approaches. Of the recommendations made by the Clinical Standards Group, only 69% of dietitians reported seeing more than half of newly diagnosed adult patients within four weeks, and less than 50% reported offering half or more of their patients an annual review. Amongst the literature in current use, 98% of dietitians use BDA literature for teaching patients and 90% use BDA publications in their own education. Seventy-six per cent of dietitians believed that there was a role for commercial slimming organizations in weight management of people with diabetes.

CONCLUSIONS

Given the proven value of dietetic input in diabetes management, there would be advantages to correcting the regional inequalities in dietetic provision for diabetes care in the UK.

Loss of 14q and 22q in gastrointestinal stromal tumors (pacemaker cell tumors)

Gastrointestinal stromal tumors (GISTs), also referred to as "gastrointestinal pacemaker cell tumors (GIPACT)" are mesenchymal neoplasms that are phenotypically similar to the interstitial cells of Cajal (ICC). Cytogenetic studies of this entity are rare and molecular cytogenetic studies utilizing chromosome-specific probes are nonexistent. In the current study, cytogenetic and molecular cytogenetic analysis of 12 histologically and immunohistochemically confirmed GISTs revealed loss of a whole chromosome 14 or region(s) of 14q in 8 tumors evaluated (67%) and loss of a whole chromosome 22 or region(s) of 22q in 8 (67%) patients. Loss of 14q and 22q were observed in histologically benign and malignant GISTs. Structural rearrangements of chromosome 1 were observed in 2 malignant GISTs. These findings indicate that loss of 14q and 22q are nonrandom, early events in GIST tumorigenesis and suggest that tumor suppressor genes responsible for the development of this neoplasm may be located on these chromosomal arms.