September 2013
Crop spraying. Photo Oliver Dixon [CC-BY-SA-2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons |
In 2007, he mentioned the taboo words
'endocrine disruption' in his re-analysis of the safety data
submitted by Monsanto on its MON683 GM maize to the European
Commission.
This was followed by a number of
publications critical of the superficial nature of existing risk
assessments for GM crops, and adding further evidence on endocrine
effects.
In 2012, Séralini
published experimental results suggesting that GM herbicide-tolerant
maize, NK603, and the 'Roundup' herbicide used with it are linked to
increased mammary tumours in susceptible animals (see GM MAIZE IS NOT SAFE TO EAT - October 2012).
With the incidence of newly-diagnosed
breast cancers running at nearly 50,000 per year in the UK,
Séralini's
findings have to be taken seriously.
Much
concern has already been voiced that a significant factor in our
cancer epidemic is the modern exposure to endocrine-disrupting
chemicals in our food and environment. The suggestion that GM
food could exacerbate the problem was not welcome.
More science is clearly needed to
establish cause-and-effect. However, a paper published in 2013 added
another piece to the GM-risk jigsaw.
A team of scientists in Thailand found
that glyphosate, the active ingredient of Roundup herbicide,
stimulated the growth of certain types of human breast cancer cells.
The mechanism was identified as being the same as that of genistein,
a key phyto-oestrogen found in soya. Importantly, the effect of the
two together was additive.
Human breast cancers which are
hormone-dependent comprise about 70% of the total. They may not be
caused by phyto-oestrogens, but exposure to
endocrine-disruptors could well be a factor in the disease becoming
catastrophic.
The study was based on model human
cancer cells in culture. A real-life situation would be more
complex, with more interacting factors pushing the disease out of
control. For example, the extra stimulus to cell growth induced by
several endocrine disruptors can be additive, as was found in the
case of glyphosate and genistein, but the effects could also be
synergistic, meaning that very low
levels of substances measured as 'safe' when they present
individually, could cause havoc when presenting together.
Several supporting
studies are cited by the authors. These include synergistic effects
between glyphosate and two forms of oestrogen, and the repeated
finding that formulated herbicides (such as Roundup) which contain
glyphosate, are more toxic than glyphosate on its own as used in
their experiment.
Interestingly,
the phyto-oestrogen profile of organic soya has been found to be very
different from both conventional and GM soya. In particular,
genistein seems to be a less significant
constituent of organic soya beans. GM soya with its glyphosate load
plus its higher levels of genistein could significantly increase the
risk of cancer in susceptible individuals.
OUR COMMENT
Courtesy of glyphosate-tolerant GM crops and the increased spraying needed to combat the surge of herbicide-tolerant super-weeds, global exposure to glyphosate in increasing year on year.
Ask our regulators to get their heads out of the sand and consider very seriously the endocrine-disrupting effects of glyphosate. The incidence of breast cancer (in males as well as females) could get much worse.
SOURCES
- Siriporn Thongprakaisang et al., 2013, Glyphosate induces human breast cancer cells growth via estrogen receptors, Food and Chemical Toxicology, June
- L. S. Santos, 2006, Chemotaxonomic markers of organic, natural, and genetically modified soybeans detected by direct infusion electrospray ionization mass spectrometry, Journal of Radioanalytical and Nuclear Chemistry, 269:2
- Gilles-Eric Séralini et al., 2012, Long term toxicity of a Roundup herbicide and a Roundup-tolerant genetically modified maize, Food and Chemical Toxicology, on-line August 2012
- Gilles-Eric Séralini et al., 2007, New Analysis of a Rat Feeding Study with a Genetically Modified Maize Reveals signs of Hepatorenal Toxicity, Archives of Environmental Contamination and Toxicology 52
- Cancer statistics for 2010 www.cancerresearchuk.org
- Estrogen receptors, http://en.wikipedia.org/wiki/Estorgen_receptor
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