Re: trabalhos interessantes X
From: Jaime (jaimen@zaz.com.br)
Thu, 29 Mar 2001 21:59:54 -0300
Oi Anabel
Não é a luz solar, é a luz visível - captada pela retina, estimulando os
centros nervosos e diminuindo os níveis do hormônio Melatonina produzido na
glândula pineal.
--
Jaime
>----- Original Message -----
From: Anabel Scaranelo <anabelms@uol.com.br>
To: Multiple recipients of list OBSTET-L <obstet-l@mail.medispecialty.com>
Sent: Thursday, March 29, 2001 8:04 PM
Subject: Re: trabalhos interessantes X
> 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
>---------------------------------------------------------------------------
> >indicates that totally blind women are at decreased risk for breast
cancer,
> >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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