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PubMed1998

Cancer and a fatiguing illness in Northern Nevada--a causal hypothesis.

PURPOSE: We investigated the possibility that chronic fatigue syndrome (CFS) predisposes to cancer by comparing the cancer pattern in an area in northern Nevada, where an outbreak of a fatiguing illness, which included cases of CFS, was reported, to an area in southern Nevada, where no such illness was reported. METHODS: Data from the computerized Nevada Cancer Registry were utilized to compare incidence rates of four malignancies--brain cancer, non-Hodgkin lymphoma (NHL), lung cancer, and breast cancer--in Washoe and Lyon Counties, where an unexplained fatiguing illness was reported during 1984-86, with comparably sized Clark County, where no such illness was reported. RESULTS: Higher incidences of NHL and primary brain tumors were noted in the two northern Nevada counties (Washoe and Lyon) in 1986 and 1987 respectively, compared to the southern Nevada (Clark) county. Similar patterns were not seen for breast or lung cancer. CONCLUSIONS: This study provides a model for investigating the possible predisposition of CFS patients to develop cancer using other cohorts, but it is currently premature to accept such a link at this time.

Adult↗
PubMed2002

Teen births, income inequality, and social capital: developing an understanding of the causal pathway.

Many studies have demonstrated a relationship between income inequality and poor health, but how does income inequality impact health? One possible explanation is that greater income inequality undermines social capital (social cohesion, civic engagement, and mutual trust in a community). We conducted path analyses of the relationship between income inequality, poverty, and teen birth rate, testing for the mediating effect of social capital in 39 US states. Birth rate was affected by both poverty and income inequality, though income inequality appeared to affect teen birth rate primarily through its impact on social capital.

Adolescent↗
PubMed2004

Causality of mesothelioma: SV40 question.

The fragility of the evidence for SV40 association with human cancer is seen in studies of NHL. A publication in 1999 stated that SV40 is rarely present in NHL. In 2002, two laboratories reported SV40 sequences in 42% to 43% of cases of NHL . One of these laboratories also detected SV40 sequences in small proportions of pediatric tumors (e.g., Wilm's tumor, hepatoblastoma, rhabdomyosarcoma, medulloblastoma, osteosarcoma, and retinoblastoma) and adult carcinomas (e.g., lung, colon, breast, and prostate) These positive results were not confirmed in subsequent studies published in 2003. Capello et al and Mackenzie et al failed to detect SV40 sequences in NHL tissues. Sanjose et al examined sera from patients with NHL and from controls for antibodies reactive to SV40 VLPs, and they detected no significant differences between the two groups. The association of SV40 with NHL is in doubt. An etiologic link between a virus and a cancer becomes plausible when evidence from different lines of enquiry (e.g., epidemiology, pathogenesis, and molecular mechanisms) is mutually reinforcing and together provides a coherent picture that can connect the biology the virus to the characteristics of the disease. The associations of human papillomaviruses with cervical cancer and hepatitis B and C viruses with hepatocellular carcinoma are examples in which the etiologic link is clear. With SV40 and mesothelioma, the data on viral sequences in tumors is inconsistent and disputed, and serologic evidence does not support any association. The epidemiologic data do not show that documented exposures tt SV40 increase the risk of mesothelioma. It seems improbable that a single virus (which cannot be conclusively demonstrated to be present in the community) contributes to the development of such a wide variety of tumors, spanning all age groups and histologic types. The weaknesses in the evidence linking SV40 with mesothelioma are summarized in Box 11 It seems unlikely that infection with SV40 contributes to the development of human mesothelioma or any other human cancer.

Animals↗
PubMed2006

Experimental evidence for a causal relationship between smoking lapse and relapse.

In this study, the authors prospectively evaluated the impact of a smoking lapse on relapse probability. After 4 days of smoking abstinence, 60 smokers were randomly assigned to smoke 5 nicotine-containing or 5 denicotinized cigarettes, or to remain abstinent (no lapse) during a 4-hr time period. Afterward, smoking abstinence was encouraged with monetary incentives, and smoking behavior was tracked for 6 days. Relative to the no-lapse condition, exposure to either of the cigarette types more than doubled the probability of subsequent smoking. Smoking outcomes did not differ between nicotine-containing and denicotinized cigarettes. The data suggest that stimulus factors may play an important role in lapse to relapse processes.

Adult↗
PubMed2005

Is there a causal relation between obesity and asthma? Evidence from Chile.

OBJECTIVE: An association between obesity and asthma symptoms has been reported in the literature, but such a relationship is inconsistent if atopic status or bronchial hyper responsiveness (BHR) is considered. The objective was to assess the association between obesity and asthma symptoms or BHR in adults. METHODS: A study was carried out in 1232 people born between 1974 and 1978 in Chile. The participants completed the European Community Health Survey questionnaire, were skin tested and subject to a BHR challenge to methacholine. MEASUREMENTS: Weight, height and waist circumference were measured and body mass index (BMI) was calculated. RESULTS: There was a positive association between wheeze and breathlessness following exercise and BMI (both with an OR 1.03, 95% CI 1.00-1.06), the associations with wheeze tended to disappear in women who did react at least to one allergen, and persisted in those who did not react to any allergens. BMI was negatively associated with BHR (OR 0.93, 95% CI 0.89-0.97). Waist circumference was not associated with asthma symptoms and it was negatively associated with BHR. CONCLUSION: Although there was an association between BMI and asthma symptoms, there were weaknesses in the evidence because waist circumference, a more direct measure of obesity than BMI, was not associated with asthma symptoms, and BMI and waist circumference were negatively associated with BHR.

Adult↗
PubMed2003

[Influenza vaccination and skin disease--coincidence or causal association?].

Influenza remains an important cause of morbidity and mortality worldwide; therefore, vaccination of risk groups is recommended by health authorities in many countries of the world. Vaccination against influenza has been implicated occasionally induce or trigger skin diseases. We review the literature and present data from the German registry for vaccination-associated adverse effects at the Paul-Ehrlich-Institut. In addition to local reactions at the injection site, exanthema, urticaria and anaphylactic reactions to vaccine components, vasculitis has been documented to be likely induced or triggered by influenza vaccination. Other skin diseases do not appear to be associated with vaccination to influenza. Overall, the risk of vaccination-associated skin disease is very low and is not a reason to avoid of influenza vaccination.

Causality↗
PubMed2001

Comparison of two clinical scales for causality assessment in hepatotoxicity.

This study was performed to compare the assessments of drug-induced liver injury obtained with 2 methods, the Council for International Organizations of Medical Sciences (CIOMS) scale and the recently validated Maria & Victorino (M&V) clinical scale, in cases submitted to a registry of hepatotoxicity. A total of 215 cases of hepatotoxicity reported with a structured reporting form were evaluated by 3 independent experts. Because of the use of multiple drugs, 228 ratings were generated. The probability of the diagnosis was classified as definitive, probable, possible, unlikely, or excluded, and evaluated for consistency with a weighted kappa statistical test. Absolute agreement between the 2 scales was observed in 42 cases (18%, weighted kappa 0.28) with disagreement of 1 level in 108 cases (47%), and of 2 levels in 70 cases (31%). The best correlation between the 2 scales was obtained for drug-induced liver injury involving a suggested immunoallergic mechanism: the disagreement was 1 level or less in 72% of the cases (34 of 48), compared with 60% of the cases (85 of 141) that involved a presumed idiosyncratic metabolic mechanism. The lowest agreement (6%) was observed in cases with evidence of cholestasis. No agreement was found in cases of fulminant hepatitis or death. The CIOMS scale showed better discriminative power and produced assessments closer to those of specialists. The performance of the M&V scale was poor in reactions with long latency periods (i.e., amoxycillin/clavulanic acid), evolution to chronicity after withdrawal (cholestatic pattern), or death.

Adolescent↗
PubMed2002

Alcohol consumption and coronary heart disease: a causal and protective factor.

Although heavy alcohol consumption is one of the leading causes of preventable deaths, light to moderate consumption of alcohol is associated with a reduced risk of coronary heart disease and total mortality. These benefits have been found in both men and women who consume as little as one to six alcoholic beverages per week regardless of whether the source is wine, beer, or liquor. Further, apparent benefits include a reduced risk for the development of peripheral arterial disease, ischemic stroke, sudden cardiac death, and angina. Even small amounts of alcohol have been associated with increases in blood pressure and increased risks of some cancers, especially breast. The difference between consuming light to moderate and heavy amounts of alcohol may mean the difference between preventing and causing premature death for all causes, especially coronary heart disease.

Alcohol Drinking↗
PubMedDate not supplied

Copper exposure and metal fume fever: lack of evidence for a causal relationship.

A systematic search was made of the world literature concerned with possible adverse health effects of inhalation exposure to copper fume and dust. Seven reports published over the past 88 years were identified that contain original human data and purport to document that exposure to copper dust or fume caused metal fume fever (MFF) or an MFF-like syndrome. Insufficient evidence was found to conclude that exposures to copper dust and copper fume cause MFF. Limitations included absence of exposure measurements, atypical symptoms and complaints, and lack of consistency among types of work associated with symptoms. Given the extensive use of copper in many industries and operations, it is evident that if copper-induced MFF does occur, it is a rare event.

Causality↗
PubMedDate not supplied

Urban and rural fertility in Bangladesh: a causal approach.

Fertility models are constructed from the 1989 Bangladesh Fertility Survey (BFS) employing path analysis. These models are developed and interpreted for urban and rural situations. As a proxy for fertility, the number of children ever born is used, and age, religion, age at marriage, parental childhood residence, and education are considered as explanatory variables. The contribution that these variables give to explaining the 1989 Bangladeshi fertility is compared to the explanatory variables that Ahmed (1981) found suitable for Bangladeshi fertility in 1975. We find that in 1989, compared to 1975, childhood background and education of the mother and age at marriage exert a greater influence on urban fertility, and religion no longer has a significant effect. In the rural case, the effect of religion on fertility has increased since 1975, as has education and age at marriage.

Adult↗