Analysis trends in incidence rates avoids some weaknesses of AIDS statistics based on absolute numbers, and should become one of the standard tools for AIDS surveillance.
The relation between education, prevalence of 17 chronic diseases or groups of diseases, and pattern of health care utilisation was evaluated from data from the 1983 Italian National Health Survey, based on 58 462 individuals aged 25 or over randomly selected within strata of geographical area, size of place of residence, and size of household, in order to be representative of the whole Italian population. Most of the diseases considered, including diabetes, hypertension, myocardial infarction and other heart disease, haemorrhoids or varices, chronic respiratory disease, anaemias, gastroduodenal ulcer, cholelithiasis and liver cirrhosis, kidney and urological diseases, arthritis, and psychiatric and neurological disturbances, were consistently less prevalent among more educated individuals. The age and sex adjusted risk estimates for individuals educated in high school or university compared with those with only a primary school education or less ranged between 0.21 for liver cirrhosis and 0.80 for anaemias. The sole exception was allergy, which was more prevalent among the more educated individuals (relative risk = 1.42). General practitioner visits and hospital admissions were reported less frequently by the more educated individuals, but specialist consultations of potential preventive value were less frequent among the less well educated. The results were similar when occupation was utilised as an indicator of social class. Thus, the findings of this national survey provide confirmation and quantitative assessment of considerable differences in health and health service utilisation according to indicators of social class.
Despite of important efforts made in the recent time, little progress has been made to better characterise high-risk PC populations and to identify genomics-based markers for its early diagnosis. PC rates continue to rise, and this disease is becoming a real public health problem in the Westernised world. International and multidisciplinary strategies to identify new markers and properly validate the promising ones are urgently needed to implement cost-efficient primary and secondary prevention interventions in PC.
As Beer et al.1 mention in their letter, our case-control studies started before the issue of acrylamide and cancer was first raised.2 Consequently, no information was collected on the browning degree of fried and baked potatoes, as well as on their cooking temperature and duration, that have been related to the concentration of acrylamide in foods.3 In any case, the reliability and validity of any such information would be undefined. Beer et al.1 also indicate that other foods or beverages, particularly coffee, contain smaller amounts of acrylamide but are widely consumed. Consequently, they may be responsible of an important proportion of acrylamide intake. In fact, according to Swiss data, coffee consumption contribute for about a third to a fifth of total acrylamide intake (Swiss Federal Office of Public Health assessment of acrylamide intake by duplicate diet study; www.bag.admin.ch). To provide further information on the issue, we include in Table I published data4, 5, 6, 7, 8, 9, 10 from the same network of case-control studies,2 as well as from other Italian and Swiss case-control studies of breast and colorectal cancers,6, 7, 8, 9 on the role of coffee consumption on the risk of selected cancers. The number of cases and controls included in the studies, odds ratios (ORs) and 95% confidence intervals for selected cancers according to consumption of coffee are given in Table I. As compared to the lowest level of coffee consumption, the ORs for the highest one were 0.6 for oral/pharyngeal and esophageal cancers, 0.8 for laryngeal cancer, 0.8 (in Italy) and 0.4 (in Switzerland) for colorectal cancer and around unity for breast and ovarian cancers. Coffee has been widely studied in relation to cancer risk, and our findings are in broad agreement with most studies on the issue.11 Although coffee is considered as a possible carcinogenic agent to the urinary bladder, an excess risk of other cancers considered has been excluded.11, 12 The inverse relation between coffee drinking and colorectal cancer has also been reported.11, 12 No noticeable differences were observed between Italian and Swiss median values of coffee consumption (about 2 cups/day), computed on the control groups. These values were similar to those reported in the Swiss assessment of acrylamide intake (mean, 2.4 servings/day; www.bag.admin.ch). Coffee is prepared in different ways in Italy and Switzerland, and its acrylamide contents may be different, too. Nevertheless, the ORs computed from the two countries were comparable. The present data confirm therefore that in the populations investigated, coffee drinking was not related to excess risk of selected cancers. Finally, a Swedish case-control study found no considerable impact of various measures of acrylamide intake on risk of large bowel, bladder and kidney cancers.13 Yours sincerely, Conducted with the financial support of the Italian Association for Cancer Research and the Italian and Swiss Leagues Against Cancer. The authors thank Mrs. M.P. Bonifacino for editorial assistance. Claudio Pelucchi, Carlo La Vecchia, Silvia Franceschi, Fabio Levi
Dietary deficiency of folate and other micronutrients involved in the one-carbon metabolism (i.e., vitamins B2, B6, B12, and methionine) have been related to several diseases, including cancers, but results on non-Hodgkin lymphoma (NHL) are controversial. A hospital-based case-control study was conducted in Italy, in 1999-2002. Cases were 190 incident, histologically confirmed NHL aged 18-84 years. Controls were 484 subjects admitted to hospitals for acute, non-neoplastic diseases supposed to be unrelated to alcohol consumption or to diet modification. Dietary habits, including alcohol drinking, were assessed by a validated food-frequency questionnaire. Nutrient intakes were computed using the Italian food composition database. Odds ratios (ORs) and corresponding 95% confidence intervals for tertiles of nutrients' intake were computed using the energy-adjusted residual models. No significant association emerged between NHL risk and intakes of folate (OR=0.9), vitamin B2 (OR=0.9), vitamin B6 (OR=0.8), and methionine (OR=0.7). However, a significant inverse association was observed for all the nutrients examined among abstainers and former drinkers, whereas no relations between one-carbon nutrients and NHL risk emerged among current alcohol drinkers. Our findings support the possibility of an antagonist effect of alcohol on the one-carbon metabolism in NHL etiology. However, the lack of an overall effect for one-carbon nutrients and the small sample size suggested caution in interpreting our results.
Sir-We have read with interest the paper of Lassise et al. recently published by the IJE on the relation between use of intrauterine devices (IUD) and risk of invasive cervical cancer.' That study, conducted in five metropolitan areas in the US on 481 cases and 801 general population controls, showed a nonsignificant reduced risk of invasive cervical cancer associated with copper IUD use (relative risk [RR] 0.6, 95% confidence interval [CI] : 0.3-1.2), but not with inert IUD use (RR 1.1, 95% CI : 0.9-1.7). To offer further data on this issue we would like to add the following.