Tu as sans doute des sources, sûres et plus que sûres?
http://potency.berkeley.edu/pdfs/Paustenbach.pdfTout est là dedans.
Overall cancer death rates in the U.S. (excluding lung cancer due to smoking) have declined 19%
since 1950 (1). The types of cancer deaths that have decreased since 1950 are primarily stomach,
cervical, uterine, and colorectal. Those that have increased are primarily lung cancer (87% is
due to smoking, as are 31% of all cancer deaths in the U.S. (2)), melanoma (probably due to
sunburns), and non-Hodgkin’s lymphoma. If lung cancer is included, mortality rates have increased
over time, but recently have declined (1). For some cancers, mortality rates have begun
to decline due in part to early detection, treatment and improved survival (2, 3), e.g., breast
cancer in women (4). The rise in incidence rates in older age groups for some cancers, can be
explained by known factors such as improved screening. “The reason for not focusing on the reported
incidence of cancer is that the scope and precision of diagnostic information, practices in
screening and early detection, and criteria for reporting cancer have changed so much over time
that trends in incidence are not reliable” (4-7). Life expectancy has continued to rise since 1950
(8).
1. Ries LAG, Eisner MP, Kosary CL, Hankey BF, Miller BA, Clegg L, Edwards BK, eds. SEER Cancer
Statistics Review, 1973-1997. Bethesda, MD:National Cancer Institute, 2000.
2. American Cancer Society. Cancer Facts & Figures - 2000. Atlanta, GA:American Cancer Society, 2000.
3. Linet MS, Ries LA, Smith MA, Tarone RE, Devesa SS. Cancer surveillance series: Recent trends in childhood
cancer incidence and mortality in the United States. J. Natl. Cancer Inst. 91:1051-1058(1999).
4. Peto R, Boreham J, Clarke M, Davies C, Beral V. UK and USA breast cancer deaths down 25% in year 2000
at ages 20-69 years. Lancet 355:1822(2000).
5. Bailar I, III, Gornik HL. Cancer undefeated. N. Engl. J. Med. 336:1569-1574(1997).
6. Doll R, Peto R. The Causes of Cancer. New York:Oxford University Press, 1981.
7. Devesa SS, Blot WJ, Stone BJ, Miller BA, Tarone RE, Fraumeni FJ, Jr. Recent cancer trends in the United
States. J. Natl. Cancer Inst. 87:175-182(1995).
8. Anderson RN. United States life tables, 1997. Natl. Vital Stat. Rep. 47:1-37(1999).
Réponse: c'est bien simple, les progrès de la médecine!
Non pas seulement, l'amélioration de la qualité sanitaire de l'alimentation est y pour beaucoup.