Hematopoietic cytokine-mediated FDG uptake simulates the appearance of diffuse metastatic disease on whole-body PET imaging

FDG-PET is increasingly being used to assess malignant tumors. However, leukocyte colony-stimulating factors (CSFs), which promote the expansion of hematopoietic bone marrow, have also been demonstrated to cause increased bone-marrow FDG uptake. Three hundred FDG-PET studies conducted over a 1-year period were reviewed for diffuse bone-marrow uptake. Elevated bone-marrow uptake on PET was correlated with pathological findings and courses of granulocyte-CSF (G-CSF) therapy. These results demonstrate that G-CSF mediated FDG uptake in bone marrow is often indistinguishable from that caused by disseminated metastatic disease. However, the bone-marrow response to G-CSF decreases rapidly following the last CSF administration. Therefore, FDG-PET in patients receiving G-CSF should be delayed, when possible, until 5 days after the end of G-CSF therapy.

Relationship of endogenous sex hormones to lipids and blood pressure in mid-aged women

PURPOSE

The relationship between endogenous sex hormones and blood lipids was examined in a representative sample of 438 Australian-born women 45 to 56 years of age taking part in a longitudinal study of the menopausal transition. Data from 363 women who were taking neither exogenous hormones nor lipid-altering medications, were not diabetic, and who had provided blood samples were available for analysis.

METHODS

Multiple linear regression was used to examine the relationship between sex hormones and high density lipoprotein cholesterol (HDL), low density lipoprotein cholesterol (LDL), triglycerides, and diastolic blood pressure (DBP), taking account of the effects of age, body mass index (BMI), smoking, alcohol intake, and exercise.

RESULTS

There was no significant relationship between estradiol and HDL, LDL, triglyceride, or DBP levels. Free androgen index was positively associated with LDL. However, BMI was an important predictor of all three lipid measures and DBP. HDL was positively associated with age and was highest among women with lowest BMI, high alcohol intake, and in nonsmokers. LDL increased with BMI, free androgen index, and age, but was lower amongst women who exercised more than two or three times per week. Triglyceride also increased with BMI, and was higher among smokers. DBP increased with BMI only.

CONCLUSIONS

The results do not support the view that endogenous sex hormones are strongly associated with cardiovascular risk factors around the time of menopause.

The intuition of the negative in Playing and reality

The author draws some parallels between his own conceptions on the work of the negative with some ideas presented by Winnicott in the ultimate version of his paper on 'Transitional objects and transitional phenomena'. He underlines the germs of the intuition of the negative in Winnicott's general theory ('not me possession', transitional object as not being the breast, the decathexis of the representation of the object). He then goes on to examine in detail the clinical material of a patient, in the last part of the paper, which has been published posthumously. In this last part the negative is mentioned explicitly and the idea is openly presented. We have here a concept of which Winnicott had the intuition without having the possibility of considering its full development and implications. It so happened that the patient whose clinical material is published in 'Playing and Reality' came to the author to continue her analytic experience. One can compare the material presented in these two analytical relationships. The author comments about his relationship with the patient and of the way she meets his own hypotheses.

Germline duplication of chromosome 2p and neuroblastoma

A child with a germline duplication of chromosome 2p, 46,XY,der(13)t(2;13)(p23;q34), who developed a fatal neuroblastoma confirmed at necropsy is reported. Fluorescent in situ hybridisation studies showed chromosome 2p (p23-pter) duplicated on chromosome 13 (q34). The clinical features of the present case shared many similarities to previous reports of trisomy 2p and there have been two cases described with neuroblastoma. Germline duplication of chromosome 2p including the N-myc proto-oncogene may have pre-disposed to the development of neuroblastoma in this case.

Diabetes insipidus from sarcoidosis confined to the posterior pituitary

A young white man with new-onset central diabetes insipidus was discovered to have a posterior pituitary mass on magnetic resonance imaging. No other radiological abnormalities were noted in the anterior pituitary, infundibulum or hypothalamus. No other endocrinopathies were present: laboratory investigations showed normal basal concentrations of anterior pituitary hormones, including prolactin. The patient was suspected to have sarcoidosis affecting the posterior pituitary, because of the discovery of pulmonary sarcoidosis during his diagnostic evaluation. His symptoms of polydipsia and polyuria responded promptly to intranasal administration of 1-desamino-8-D-arginine vasopressin (DDAVP). The patient demonstrated complete regression of the posterior pituitary mass after a course of corticosteroid therapy. However, his diabetes insipidus persisted and he continues to need DDAVP treatment, currently at 12 months of follow-up. The resolution of the neurohypophysial mass was compatible with the diagnosis of pituitary sarcoidosis and this precluded the need for a transsphenoidal biopsy or surgery.

A bioluminescent assay for agonist activity at potentially any G-protein-coupled receptor

Transient expression of apoaequorin in Chinese hamster ovary (CHO) cells and reconstitution with the co-factor coelenterazine resulted in a large, concentration-dependent agonist-mediated luminescent response following cotransfection with the endothelin ETA, angiotensin ATII, thyrotropin-releasing hormone (TRH), and neurokinin NK1 receptors, all of which interact pre-dominantly with the G alpha q-like phosphoinositidase-linked G-proteins. A substantially greater luminescence was obtained with mitochondrially targeted apoaequorin compared to cytoplasmically expressed apoaequorin. To generate a system amenable for the study of agonist activity at virtually any G-protein-coupled receptor the alpha subunit of the receptor promiscuous G-protein G alpha 16 was either transiently or stably expressed in CHO cells together with apoaequorin. In cells expressing G alpha 16, but not in its absence, agonists at a series of receptors which normally interact with either G alpha s or G alpha i were now able to cause a luminescent response from mitochondrially targeted apoaequorin. In the case of the A1 adenosine receptor, this response was clearly a result of activation of G alpha 16 and not a consequence of the release of the G alpha i-associated beta/gamma complex, as the luminescent response was unaffected by pertussis toxin treatment of the cells, whereas agonist-mediated inhibition of adenylyl cyclase activity was attenuated. These studies describe the use of coexpressed apoaequorin as a reporter for G-protein-coupled receptor-mediated calcium signaling. Furthermore, coexpression of G alpha 16 and apoaequorin provides a basis for a generic mammalian cell microplate assay for the assessment of agonist action at virtually any G-protein-coupled receptor, including orphan receptors for which the physiological signal transduction mechanism may be unknown.

Gastric graft-versus-host disease: a blinded histologic study

Acute graft-versus-host disease (GvHD) of the upper gastrointestinal (GI) tract is common after allogeneic bone marrow transplantation (BMT). However, diagnosis cannot be made on clinical presentation and endoscopic findings alone, because these are nonspecific, and histologic confirmation is often desirable. The diagnosis of gastric GvHD is often based on subtle findings with considerable potential for variability in interpretation. Evaluation of the reproducibility of diagnosis and recognition of histologic features of gastric GvHD was based on blinded review of 56 gastric biopsies (24 from patients with allogeneic BMT or unrelated umbilical cord blood transplantation and 32 control biopsies from patients who did not undergo BMT, of whom eight had active GI cytomegalovirus [CMV] infection). Histologic criteria for GvHD were apoptosis and gland destruction, sparse inflammatory infiltrate, and granular eosinophilic debris in dilated glands. Seventeen patients (22 biopsies) were judged to have clinical GvHD on the basis of skin or liver involvement and GI symptoms without other known cause. Eighteen of these 22 gastric biopsies were classified as GvHD by at least two of the three pathologists on initial review. Blinded histologic diagnosis of GvHD had a positive predictive value of 69%, a sensitivity of 82%, and specificity of 76%. False-positive results occurred in CMV gastritis, human immunodeficiency virus (HIV) infection, primary immunodeficiency, and after renal transplantation. Of individual features, granular debris in glands was a specific (94% specificity), but insensitive (41% sensitivity) marker for GvHD. Distinction between GvHD and CMV infection can be difficult, and GvHD can be confused with changes seen in HIV infection and other immunodeficiency states.

Insulin resistance in adipocytes after downregulation of Gi subtypes

To determine whether downregulation of Gi proteins is associated with insulin resistance, we incubated isolated adipocytes with N6-(2-phenylisopropyl)adenosine (PIA; an A1-adenosine receptor agonist; 300 nM), prostaglandin E1 (PGE1; 3 microM), or nicotinic acid (1 mM) for 4 days in primary culture. The cells were washed, and the rate of glucose transport (2-deoxy-[3H]glucose uptake) was measured after incubation with various concentrations of insulin for 45 min. Both PIA and PGE1 (which downregulate Gi) decreased the maximal responsiveness of the cells to insulin by approximately 30% and caused a rightward shift in the dose-response curve. By contrast, nicotinic acid (which does not downregulate Gi) did not alter the insulin sensitivity of the cells. Prolonged treatment of adipocytes with either PIA or PGE1 (but not nicotinic acid) rendered the cells completely resistant to the antilipolytic effect of insulin. The ability of insulin to stimulate autophosphorylation of the beta-subunit of the insulin receptor was decreased by approximately 30% in PIA-treated cells, and the dose-response curve was shifted to the right. Similarly, the ability of the receptor to phosphorylate poly(Glu4-Tyr1) was decreased by approximately 35%. This decrease in tyrosine kinase activity of the receptor may account for the decrease in insulin sensitivity of glucose transport but cannot account for the complete loss of antilipolysis. The findings suggest both a direct and indirect involvement of Gi proteins in insulin action.

Wherein lies the truth? Assessment of agreement between parent proxy and child respondents

BACKGROUND

The epidemiological study of diseases of childhood presents a special situation in that the principal respondent is almost always a person other than the index. Use of proxy respondents in paediatric epidemiology has been little studied compared with the use of surrogate respondents for adults.

METHODS

Agreement between responses from children and their parents to identical questions about the children was assessed in a case-control study of childhood melanoma in Queensland, Australia. Weighted kappa and log-linear modelling techniques were used to measure agreement for ordinal data.

RESULTS

Highest agreement was found for reports of unchanging physical characteristics such as eye colour (kappa = 0.88), hair colour (kappa = 0.76), and for history of residing on a farm (kappa = 0.84). Moderate agreement was seen for density of facial freckling (kappa = 0.62), propensity to sunburn (kappa = 0.46) and tanning ability (kappa = 0.47). Variables with low levels of agreement between parent proxy and child respondents included density of freckling on the shoulders (kappa = 0.28) and degree of moliness of the skin at age 5 years (kappa = 0.24). Agreement did not vary according to age or sex of the children. Log-linear modelling was performed to determine the type and magnitude of components of agreement.

CONCLUSIONS

Agreement between responses from children and parent proxies depends largely upon the type of information sought, rather than characteristics of the respondents.

Sun exposure, sunscreen and their effects on epidermal Langerhans cells

This study examined the effects of chronic and current sun exposure on the number of Langerhans cells in epidermal sheets of UV-exposed and unexposed skin of the arms and assessed the effect of sunscreens. Participants were enrolled in a skin cancer prevention trial and had been using sunscreen daily for the previous 3 years. There were significantly fewer Langerhans cells on the exposed (463 cells/mm2) than on the unexposed forearm (528 cells/mm2) (P = 0.0001). High sun exposure in the previous 2 weeks and a history of predominantly outdoor occupations were both associated with a reduced number of Langerhans cells, although age and other biological indicators of chronic exposure were not associated. Sunscreen use was protective against the effects of current but not chronic sun exposure, with a suggestion of a greater effect at higher levels of exposure. Unexpectedly, people with a past history of nonmelanoma skin cancer had more Langerhans cells in both the exposed and the unexposed skin. These results emphasize the need for continued public health education to protect the immune system from the damaging effects of UV radiation.

Health planning in Pakistan: a case study

Health planning is an essential function of the state. For it to be successful, a number of conditions need to be satisfied. In particular it needs to be flexible, participative and integrated with other decision processes. Despite some strengths, the health planning system in Pakistan has generally failed to provide the framework to allow such an approach. Links between strategic and operational planning have been weak; decision-making has been very centralized; there has been a lack of functional clarity; the respective roles of bureaucrats and politicians have been unclear; and, links between capital and recurrent budgets and between planning and implementation have been weak. As a result, there is a number of imbalances in the allocation of resources. The introduction of a revised health planning system for Pakistan is discussed. The constraints on such a system and an initial assessment of its success are presented.

Ultraviolet radiation, melanocytic naevi and their dose-response relationship

Melanocytic naevi on the face and neck of 110 Brisbane secondary school students aged 16-17 years were mapped according to specified regions to investigate the dose-response relationship between ultraviolet (UV) radiation and melanocytic naevi. Highest naevus density occurred in regions receiving a mean UV dose of 0.2-0.4 relative to the vertex while densities were low in minimally and maximally exposed regions. This pattern of naevus distribution was unaffected by sex or phenotypic features such as skin colour or degree of freckling. These findings suggest that there is a narrow dose range over which UV radiation can effectively promote the proliferation of melanocytes. A comparison of the regional distribution of naevi on the face and neck with that of solar keratoses appearing over 1 year on the heads of residents of a neighbouring town has shown them to differ significantly. This study may shed some light on the unknown, yet expectedly complex, relation of UV radiation to melanocytic naevi.

Tubal sterilisation, hysterectomy and decreased risk of ovarian cancer. Survey of Women's Health Study Group

We have examined the effect of tubal sterilisation and hysterectomy on risk of ovarian cancer in a large case-control study in eastern Australia involving 824 women aged 18-79 years, diagnosed with epithelial ovarian cancer between 1990 and 1993, and 855 controls randomly selected from the electoral roll. Relative risks for ovarian cancer were estimated using multiple categorical regression to adjust for age, parity, oral contraceptive use and other risk factors. Tubal sterilisation was associated with a 39% reduction in risk of ovarian cancer (RR 0.61, 95% CI 0.46-0.85) and hysterectomy with a 36% reduction (RR 0.64, 95% CI 0.48-0.85). Risk remained low 25 years after surgery and was reduced irrespective of sterilisation technique, and estimates were similar among various types of epithelial ovarian cancer. The greatest reduction (74%) was observed among women with primary peritoneal tumours. Pelvic infection and use of vaginal sprays or contraceptive foams were not related to ovarian cancer, while use of talc in the perineal region slightly but significantly increased risk among women with patent fallopian tubes. Reportedly heavy or painful menses, perhaps associated with retrograde flow, were associated with ovarian cancer, and reduction in risk of disease after hysterectomy was greatest among women who had heavy periods. Our findings support the theory that contaminants from the vagina, such as talc, and from the uterus, such as endometrium, gain access to the peritoneal cavity through patent fallopian tubes and may enhance the malignant transformation of ovarian surface epithelium. Surgical tubal occlusion may reduce the risk of ovarian cancer by preventing the access of such agents.

Validity of self-reported hysterectomy and tubal sterilisation. The Survey of Women's Health Study Group

Both hysterectomy and tubal sterilisation offer significant protection from ovarian cancer, and the risk of cardiovascular disease in women is lowered after hysterectomy. Since little is known about the accuracy of women's self-reports of these procedures, we assessed their reliability and validity using data obtained in a case-control study of ovarian cancer. There was 100 per cent repeatability for both positive and negative histories of hysterectomy and tubal sterilisation among a small sample of women on reinterview. Verification of surgery was sought against surgeons' or medical records, or if these were unavailable, from randomly selected current general practitioners for 51 cases and 155 controls reporting a hysterectomy and 73 cases and 137 controls reporting a tubal sterilisation. Validation rate for self-reported hysterectomy against medical reports (32 cases, 96 controls) was 96 per cent (95 per cent confidence interval (CI) 91 to 99) and for tubal sterilisation (32 cases, 77 controls) it was 88 per cent (CI 81 to 93), which is likely to be an underestimate. Although findings are based on small numbers of women for whom medical reports could be ascertained, they are consistent with other findings that suggest women have good recall of past histories of hysterectomy and tubal sterilisation; this allows long-term effects of these procedures to be studied with reasonable accuracy from self-reports.

Cancer and diabetes--a follow-up study of two population-based cohorts of diabetic patients

OBJECTIVES

To study the occurrence of cancer amongst patients with diabetes mellitus (DM).

DESIGN

Population based cohort study.

SETTING

Denmark.

SUBJECTS

Two cohorts of patients with DM were identified. One cohort comprised 1659 conscripts diagnosed with type I DM before the age of 20 years. Another cohort comprised 1499 men and women with insulin treated DM identified by means of medical prescriptions on 1 July 1973. Both cohorts were followed until the end of 1992.

MAIN OUTCOME MEASURES

The relative risk of cancer in the two cohorts was estimated as the ratio of observed to expected number of cancers in the cohort (SIR).

RESULTS

No unusual risk of cancer was observed amongst the conscripts (SIR 0.9, n = 13) or amongst patients with onset of DM before the age of 30 years in the prescription cohort (SIR 0.9, n = 32). Amongst those aged 30 years or more at DM onset in the prescription cohort, the overall risk of cancer did not depart from normal (SIR 1.0, n = 103), however, pancreatic cancer occurred in excess both immediately (< 1 year) (SIR 190, n = 1), and during 1-9 years after DM onset (SIR 9.0, n = 4). Similarly, the risk of non-Hodgkin's lymphoma was increased significantly (SIR 3.3, n = 6), all cases occurring more than 10 years after DM onset.

CONCLUSIONS

Our data suggest that there is no unusual risk of cancer associated with type I DM. Type II DM may be the first symptom of pancreatic cancer and may be associated with an increased risk of non-Hodgkin's lymphoma.

Population based study of prevalence of islet cell autoantibodies in monozygotic and dizygotic Danish twin pairs with insulin dependent diabetes mellitus

OBJECTIVE

To study the comparative importance of environment and genes in the development of islet cell autoimmunity associated with insulin dependent diabetes mellitus.

DESIGN

Population based study of diabetic twins.

SETTING

Danish population.

SUBJECTS

18 monozygotic and 36 dizygotic twin pairs with one or both partners having insulin dependent diabetes.

MAIN OUTCOME MEASURES

Presence of islet cell antibodies, insulin autoantibodies, and autoantibodies to glutamic acid decarboxylase (GAD65) in serum samples from twin pairs 10 years (range 0-30 years) and 9.5 years (2-30 years) after onset of disease.

RESULTS

In those with diabetes the prevalence of islet cell antibodies, insulin autoantibodies, and autoantibodies to glutamic acid decarboxylase in the 26 monozygotic twins was 38%, 85%, and 92%, respectively, and in the dizygotic twins was 57%, 70%, and 57%, respectively. In those without diabetes the proportions were 20%, 50%, and 40% in the 10 monozygotic twins and 26%, 49%, and 40% in the 35 dizygotic twins.

CONCLUSION

There is no difference between the prevalence of islet cell autoantibodies in dizygotic and monozygotic twins without diabetes, suggesting that islet cell autoimmunity is environmentally rather than genetically determined. Furthermore, the prevalence of islet cell antibodies was higher in the non-diabetic twins than in other first degree relatives of patients with insulin dependent diabetes. This implies that the prenatal or early postnatal period during which twins are exposed to the same environment, in contrast with that experienced by first degree relatives, is of aetiological importance.