Re: Swine Flu Deaths

On Sep 26, 1:42 am, Peter Bowditch <myfirstn...@xxxxxxxxxxx> wrote:



Trig

I wasn't responding to her. I was asking her for her reasons for
saying something. Her answer "Because it blocks the sun" told me
nothing.

What else is new with Jan?

more comments below in a several places

Perhaps you haven't come across the alt-med nutcases
who claim that sunblock causes melanoma. They base this on the
correlation between sunblock use and rate of cancer,
arguing that the countries with the
highest level of sunblock use also have the highest rate of skin
cancer.

The research does indicate that sun exposure does some
good in the face of melanoma but of course there are
other types of skin cancer. The benefical mechanism
of sun exposure is most likely the level of vitamin D that
results. I do not deny UV does damage as well. UV
or the lack of it has dictated the pigmentation levels
of the native populations. Both of us are more adapted
to the Arctic Circle, Scotland, Sweden,the city of Seattle,
or the city of Vancouver BC than to say somewhere near
the tropics or the low latitude temperate regions.


Consider the results section of the following two abstracts.

"Sun exposure is associated with increased survival from
melanoma."

and

"CMM risk was not significantly associated with
outdoor work.

CONCLUSION:
Our study confirms previous reports on the increased
risk of BCC and SCC in outdoor workers compared
to indoor workers."


Full abstracts below.



J Natl Cancer Inst. 2005 Feb 2;97(3):195-9.

Sun exposure and mortality from melanoma.

Berwick M, Armstrong BK, Ben-Porat L, Fine J,
Kricker A, Eberle C, Barnhill R.

University of New Mexico,
Department of Internal Medicine,
New Mexico Cancer Research Facility,
MSC08 4630, Room 103A, 1 University of New Mexico,
Albuquerque, NM 87131,
USA.

BACKGROUND:
Melanoma incidence and survival are positively
associated, both geographically and temporally.
Solar elastosis, a histologic indicator of
cutaneous sun damage, has also been positively
associated with melanoma survival.
Although these observations raise the possibility
that sun exposure increases melanoma survival,
they could be explained by an association between
incidence and early detection of melanoma.
We therefore evaluated the association between
measures of skin screening and death from
cutaneous melanoma.

METHODS:
Case subjects (n = 528) from a population-based
study of cutaneous melanoma were followed for an
average of more than 5 years. Data, including
measures of intermittent sun exposure, perceived
awareness of the skin, skin self-screening,
and physician screening, were collected during
in-person interviews and review of
histopathology and histologic parameters
(i.e., solar elastosis, Breslow thickness,
and mitoses) for all of the lesions. Competing
risk models were used to compute risk of death
(hazard ratios [HRs], with 95% confidence intervals
[CIs]) from melanoma. All statistical tests
were two-sided.

RESULTS:
Sunburn, high intermittent sun exposure, skin
awareness histories, and solar elastosis
were statistically significantly inversely
associated with death from melanoma.
Melanoma thickness, mitoses, ulceration, and
anatomic location on the head and
neck were statistically significantly positively
associated with melanoma death.
In a multivariable competing risk analysis,
skin awareness (with versus without,
HR = 0.5, 95% CI = 0.3 to 0.9, P = .022)
and solar elastosis (present versus
absent, HR = 0.4, 95% CI = 0.2 to 0.8,
P = .009) were strongly and independently
associated with melanoma death after
adjusting for Breslow thickness, mitotic
index, and head and neck location, which
were also independently associated with
death.

CONCLUSIONS:
Sun exposure is associated with increased survival from
melanoma.


PMID: 15687362

=====================================================================

Int Arch Occup Environ Health.
2009 Feb;82(3):357-63. Epub 2008 Jul 23.

Outdoor work and skin cancer incidence:
a registry-based study in Bavaria.

Radespiel-Tröger M, Meyer M, Pfahlberg A,
Lausen B, Uter W, Gefeller O.

Population-based Cancer Registry Bavaria,

Registration office, Erlangen, Germany.

OBJECTIVE:
To analyse the association between occupational
ultraviolet (UV) light exposure and skin cancer
(basal cell carcinoma, BCC; squamous cell carcinoma,
SCC; cutaneous malignant melanoma, CMM) based on data
from the Bavarian population-based cancer registry.

METHODS:
The population-based cancer registry of Bavaria (Germany)
provided data on incident cases of BCC, SCC, and CMM,
respectively, during the period 2001 until 2005.
Eleven Bavarian districts with complete skin cancer
registration were included in this analysis based on
2,156,336 person years. Cases were assigned to
"indoor", "mixed indoor/outdoor", and "outdoor" exposure
categories according to their job title. We computed
age-specific and age-adjusted incidence rates of BCC
(n = 1,641), SCC (n = 499),and CMM (n = 454) by work
type, and the relative risk (RR) of skin cancer
occurrence for "outdoor" and "mixed indoor/outdoor"
workers, respectively, compared to "indoor" workers.

RESULTS:
The risk of BCC was substantially elevated
in male (RR, 2.9; 95% CI, 2.2-3.9) and female
(RR, 2.7; 95% CI, 1.8-4.1) outdoor
workers compared to male and female indoor workers,
respectively. We also found an elevated risk of similar
magnitude for SCC in male (RR, 2.5; 95% CI, 1.4-4.7)
and female (RR, 3.6; 95% CI, 1.6-8.1) outdoor workers
compared to male and female indoor workers, respectively.
CMM risk was not significantly associated with
outdoor work.

CONCLUSION:
Our study confirms previous reports on the increased
risk of BCC and SCC in outdoor workers compared
to indoor workers.


PMID: 18649084


more below

I am aware of the possibility ofVitaminD deficiency if someone was
to only go outside when completely covered with 30+ sunblock, but as I
live in the country which tops both sunblock use and melanoma
frequency I am also exposed to lots of information about both.

Yes, 20 minutes in the sun each day is a real good thing. More than
that and we Australians start chanting the indelible summer time
advertising slogan "Slip, slop, slap". Slip on a shirt, slop on some
sunblock, slap on a hat.

For some people of certain prescription meds 20 minutes is far too
much.
For some 10 minutes would be better though I'd suggest more skin
area than simple the arms and face. And certainly one can get
pretty wildly photoaged with lots of sun. I am on speaking terms
with a women who is heavily photoaged that is my age and
she can't seem to believe that I am her age. I am a hat wearer
and I've had the luxury most of life of limiting my exposure to
the midday spring and summer sun. I remind her that she
has run a ranch for a couple of decades all in the midday
sun. And encourage her the sun exposure may have
lower her organ cancer risks. Not that I've elaborated as
to the mechanism, I keep it simple with some people.



And yes, I have had two malignant skin cancers removed. There was no
sunblock back in the Cretaceous when I was a surfer.

Or at least one had to have a pharmacist to mix it up. Back in the 50s
and 60s
some used a solution of PABA and ethanol. Which has since been
removed from the market as dangerous for topical application.
So you may have lucked out not knowing about it, if the risk is
was/is for real. It did prevent sunburn.

Trig


--
Peter Bowditch aa #2243


.

Relevant Pages

  • Re: Cancer concept
    ... "The Sun does not cause cancer. ... Man made a mistake in creating sunscreens. ... have a much higher rate of skin cancer than those that do not use it and ...
    (talk.politics.medicine)
  • Re: Naturism and skin cancer
    ... warning of the suns effects on the naked skin. ... Burkeman compares skin cancer rates in Scotland and Australia, ... A relationship between melanoma and UVR is ... The true balance of benefit and risk of tanning and UVR has still to be ...
    (uk.rec.naturist)
  • Re: Naturism and skin cancer
    ... warning of the suns effects on the naked skin. ... Views about ultraviolet radiation (UVR) have changed: ... Burkeman compares skin cancer rates in Scotland and Australia, ... fear on the sun, especially over Glasgow. ...
    (uk.rec.naturist)
  • Re: Cancer concept
    ... cancer at all, because it was caused by the sun. ... or on the skin. ... Man made a mistake in creating sunscreens. ...
    (talk.politics.medicine)
  • Sun Exposure Increases Survival from Melanoma
    ... Roman Bystrianyk, "Sun Exposure Increases Survival from Melanoma", ... skin cancer is the most common cancer in ... The incidence of skin cancers has been increasing ...
    (sci.med.diseases.cancer)
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