2,971 publications from this institution
This study provides additional evidence that diabetes is unrelated to gastric cancer overall but may be associated with excess cardia gastric cancer risk.
Two papers in this issue of the Revista Panamericana de Salud Pblica/Pan American Journal of Public Health address the problem of detection and screening strategies for cancer prevention. One paper is on the diffusion of Pap smear tests for cervical cancer prevention in a high-risk area of South America (1), and the other is on prostate-specific antigen (PSA) and digital rectal examinations in the diagnosis of prostate cancer (2). A third study in this issue analyzes the incidence of cancer among Hispanic children in the United States of America, including mainly neoplasms of the lymphoid and hematopoietic system, many of which are amenable to treatment (3). These screening and diagnostic tests, as well as modern treatments for leukemias and Hodgkin's lymphomas, are largely available in developed countries, such as those of North America (Canada and the United States) and Western Europe. As illustrated by the paper by Dzuba et al. (1), there have been some delays in the adoption of organized programs and strategies for cancer prevention and treatment in some countries of Central America and South America. Even in the United States there are racial and ethnic disparities in cancer incidence and mortality (3, 4), which suggests that not all segments of the population in the country benefit equally from progress in the prevention, early detection, and treatment of cancer.
An overview is given of recent patterns of trends in cancer mortality in various age groups in Italy and, for comparative purposes, in other European countries. Important changes in mortality for several major cancer sites have been observed over the last two decades, such as the declines in gastric cancer or the increases in lung cancer mortality. These are difficult to understand and justify from an epidemiological and public health viewpoint, since the main cause of lung cancer (cigarette smoking) has long been known, while the determinants of stomach cancer are still largely undefined. Changes were minor, and inconsistent across countries, for other major cancers, such as intestines or breast. Furthermore, trends were systematically more favourable in young adults (and, to a less extent middle age), as compared to the elderly. The decline in young adults reflects more favourable exposure to risk factors (eg declined smoking prevalence, better diet), but also improvements in diagnostic and therapeutic procedures for some cancers. Due caution is required in any extrapolation, particularly since the distribution of the most common types of cancer changes in subsequent age groups. These favourable trends in young adults offer, none the less, important (and positive) indications as to the likely future trends when the same generations will reach middle and older age.