Homebrew PCBs

Hello everyone,
 This is my first post to this great group. I meant to reply to this
sooner, but just didn't get a round tuit. :) Before anyone asks you to
believe chemical exposures (other than chronic occupational
overexposures) cause cancers, please first consider the latest
clinical findings by scientistss invloved in cancer research, not
toxicologists or environmentalists. The findings of the latter two
academicians must be understood within the context of the metrics they
use to rate carcinogenicity, metrics which leading cancer researchers
have recently denounced as false and worthless. The metrics, such as
the Ames Assay, were once believed accurate, but now it seems clear
were based on false assumptions about thresholds of exposures and
confounded further by the lack of proper exposure control groups when
these metrics were originally postulated.
 There is always a lapse of time, usually measured in years, between
laboratory research and implementation in the legal/regulatory world.
This is further confounded by the current popular thought on this
subject, shaped as it is by 30 odd years of drumming into our
collective conciousness the mantra: "Kemicalzs Kauzes Kancer". But
when the very scientists who once warned us thusly now say "It just
isn't so", and when the leading advocate of this new thinking on
cancer and chemicals is no less than the world's most published
scientist and currently one of the world's leading cancer researchers,
THEN you can believe it!

http://europa.eu.int/comm/environment/ppps/ma_reding_annex2.pdf

 Just use common sense and practice standard industrial hygene: limit
exposure with appropriate clothing and practices, and wash of
accidental exposures without delay, and then QUIT WORRYING!

Jimbo

P.S.

If the IPA/cancer link were really plausible would'nt millions of
people be at serious risk since IPA is used by the drum as a
medicinal/theraputic topical? Wouldn't those areas of the body so
chronically exposed then become predominant tumor sites? NO such link
has ever been documented. Many people have suffered acute toxicity
(poisoning)from overexposure to IPA in theraputic contexts, but no
suspect cancers were reported.

From OSHA:

Epidemiological studies suggested an association between isopropyl
alcohol and paranasal sinus cancer; however, subsequent analysis
suggests that the "strong-acid" process used to manufacture isopropyl
alcohol may be responsible for these cancers [ACGIH 1991]. The
International Agency for Research on Cancer has concluded that the
evidence for the carcinogenicity of this process is adequate but that
the evidence for isopropyl alcohol itself is inadequate [IARC 1987].



--- In Homebrew_PCBs@yahoogroups.com, "mikezcnc" <eemikez@c...> wrote:
> Stefan,
> 
> I would like three issues answered by a chemist and or pharmacist 
> (although here I suspect that argument would be made that since it
is 
> used for rubbing then it must be ok:
> 
> 1. The web search reveals that IPA causes cancer. We might get into 
> semantics on that one, but we should not use an argument of rubbing 
> alcohol being healthy, therfeore and the reason being that that 
> discussion might turn in to medical subject which I won't get into.
I 
> know it is carcinogennic and if someone believes otherwise, I can 
> respect that.