Re: trabalhos interessantes X
From: Anabel Scaranelo (anabelms@uol.com.br)
Thu, 29 Mar 2001 17:03:10 -0600 (CST)
Seria interessante fazer esta pesquisa com mulheres radiologistas ou que
trabalham nesse segmento (atendentes de enfermagem, técnicas de RX,
Ressonância), pois muitas vezes passamos umas boas 08 a 10 horas por dia
longe da luz do sol...
At Wed, 28 Mar 2001, Jaime wrote:
>
> Aos colegas da lista
>
> Mulherese cegas ou parcialmente cegas têm menor risco de câncer de
>mama.
>
>Dr. J. Kliukiene e sua equipe, Noruega acompanharam 15.412 mulheres
>deficientes visuais, desde 1961 e descobriram que essas mulheres têm baixo
>risco para ca de mama.
>
>Isso reforça a "Hipótese da Melatonina": A luz visível diminui os niveis de
>Melatonina e os baixos níveis de Melatonina estariam associados a maior
>incidência de ca de mama.
>
>O trabalho foi publicado no British Journal of Cancer em 02 de fevereiro de
>2001.
>
>Mais detalhes:
>
>Risk of Breast Cancer Decreased in Blind Women
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>WESTPORT, CT (Reuters Health) Mar 09 - Research conducted in Norway
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>indicates that totally blind women are at decreased risk for breast cancer,
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>especially those who became blind before age 65 years. "Our findings give
>support to the 'melatonin hypothesis'," the researchers say, which
>postulates that melatonin has a protective effect against breast cancer.
>
>Dr. J. Kliukiene and colleagues, of the Cancer Registry of Norway, in Oslo,
>used data from the Norwegian Registry of Blindness to identify 15,412
>visually impaired women. Of these, 396 were totally blind.
>
>Based on follow-up beginning in 1961 or at the onset of blindness, the
>standardized incidence ratio for breast cancer was 0.64 in totally blind
>women. For those blinded before age 65, the incidence ratio was 0.51, the
>investigators report in the British Journal of Cancer for February 2.
>
>There appeared to be no association between visual impairment short of total
>blindness and breast cancer, as illustrated by the standardized incidence
>ratio of 0.92 for those with moderate low vision and 1.21 for those with
>near-total blindness.
>
>According to the authors, experimental evidence shows that increased
>nocturnal exposure to visible light reduces melatonin levels and is
>associated with increased growth of breast cancer. Blind women who are not
>ocularly receptive to light may maintain melatonin production at night
>regardless of light exposure. Dr. Kliukiene's team suggests that this is the
>mechanism whereby these women are protected from breast cancer.
>
>Br J Cancer 2001;84:397-399.
>
>--
> Jaime Nonato http://www.geocities.com/jjndo jaimen@zaz.com.br
>
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