Skip to main content

Monsanto Roundup weedkiller and GM corn linked to cancer

In the first ever peer-reviewed, long-term animal study of GMO foods, genetically engineered corn has been linked to mammary tumors, kidney and liver damage and other serious illnesses in rats.

The study examined the long-term effects of Monsanto’s Roundup weedkiller and  NK603 Roundup-resistant GM maize.  "Scientists found that rats exposed to even the smallest amounts, developed mammary tumours and severe liver and kidney damage as early as four months in males, and seven months for females, compared with 23 and 14 months respectively for a control group," according to The Grocer. (

The findings were published today in the journal Food and Chemical Toxicology:

While numerous 90-day studies have already linked GMO foods to allergies and other health problems, today’s publication marks the first-ever long term animal study on the health effects of genetically engineered foods, and comes as California voters consider the Proposition 37 Right to Know initiative to label genetically engineered foods, according to a news release from the Yes on Proposition 37 Campaign.


“The results of this study are worrying," responded Yes on Proposition 37 Campaign Manager Gary Ruskin. "They underscore the importance of giving California families the right to know whether our food is genetically engineered, and to decide for ourselves whether we want to gamble with our health by eating GMO foods that have not been adequately studied and have not been proven safe."

"By requiring simple labels on genetically engineered foods, Proposition 37 gives Californians the ability to choose whether to expose ourselves and our families to any potential health risks.  The right to know is fundamental, and that’s why 50 countries around the world have already enacted labeling requirements for genetically engineered food," Ruskin stated.  

The study’s authors, together with the non-profit organization Sustainable Food Trust, will be hosting a press conference call today to discuss the study at 11:30 a.m. PDT

The Telephone press conference press briefing will cover the first animal feeding trial studying the lifetime effects of exposure to Roundup tolerant GM maize, and Roundup, the world’s best-selling weedkiller.  

Professor Gilles-Eric Séralini, Molecular Biologist at Caen University and first author of the research being discussed. Professor Séralini was in charge of risk assessment for two government commissions and has advised the European Commission on the use of GMO’s commercially. He is the President of the Scientific Board at Committee of Independent Research and Information on Genetic Engineering (CRII-GEN).

Dr. Michael Antoniou, Professor of Molecular Genetics at Kings College, London School of Medicine. Dr. Antoniou has over 40 peer-reviewed publications of original work.

Patrick Holden, former director of the UK Soil Association and Founder of the Sustainable Food Trust (SFT). SFT has an interest in comparing different systems of agriculture and their impact on human and environmental health.

This briefing is for credentialed media only.  An audio file of this call will be posted to after the briefing. One-on-one interviews available upon request. High-resolution images will be available online and by request.

Jamie Shor    | 202.339.9598 |
Rachel Finan | 202.339.9598 |

Study Abstract: The health effects of a Roundup-tolerant genetically modified maize (from 11% in the diet), cultivated with or without Roundup, and Roundup alone (from 0.1 ppb in water), were studied 2 years in rats. In females, all treated groups died 2–3 times more than controls, and more rapidly. This difference was visible in 3 male groups fed GMOs.

All results were hormone and sex dependent, and the pathological profiles were comparable. Females developed large mammary tumors almost always more often than and before controls, the pituitary was the second most disabled organ; the sex hormonal balance was modified by GMO and Roundup treatments. In treated males, liver congestions and necrosis were 2.5–5.5 times higher.

This pathology was confirmed by optic and transmission electron microscopy. Marked
and severe kidney nephropathies were also generally 1.3–2.3 greater. Males presented 4 times more large palpable tumors than controls which occurred up to 600 days earlier.

Biochemistry data confirmed very significant kidney chronic deficiencies; for all treatments and both sexes, 76% of the altered parameters were kidney related. These results can be explained by the non linear endocrine-disrupting effects of
Roundup, but also by the overexpression of the transgene in the GMO and its metabolic consequences.

CRIIGEN - Committee of Research and Independent Information on Genetic Engineering

The Committee of Research and Independent Information on Genetic Engineering (CRIIGEN) is a non-profit organization set up by Professor Gilles-Eric Seralini, a Professor of Molecular Biology at Caen University, to offer scientific expertise on pollutants to health and environment.  It is particularly focused on GMO’s and their impact on agriculture, food, medicine and human health. Professor Seralini was in charge of risk assessment for two government commissions and has advised the European Commission on the use of GMO’s commercially.

The Sustainable Food Trust

The Sustainable Food Trust was set up by the former director of the Soil Association, Patrick Holden. The charity aims to bring together the many groups and individuals working internationally in this area to help transform our present food system and meet the multiple challenges of climate change, resource depletion, food security and population growth. One of its particular areas of interest is in comparison between different systems of agriculture and their impact on human and environmental health.

For more information about the historic ballot initiative Proposition 37, see, contact:  Stacy Malkan, 510-542-9224,

Reuters story about the study:

Your Email has been sent.
You must add at least one tag to this diary before publishing it.

Add keywords that describe this diary. Separate multiple keywords with commas.
Tagging tips - Search For Tags - Browse For Tags


More Tagging tips:

A tag is a way to search for this diary. If someone is searching for "Barack Obama," is this a diary they'd be trying to find?

Use a person's full name, without any title. Senator Obama may become President Obama, and Michelle Obama might run for office.

If your diary covers an election or elected official, use election tags, which are generally the state abbreviation followed by the office. CA-01 is the first district House seat. CA-Sen covers both senate races. NY-GOV covers the New York governor's race.

Tags do not compound: that is, "education reform" is a completely different tag from "education". A tag like "reform" alone is probably not meaningful.

Consider if one or more of these tags fits your diary: Civil Rights, Community, Congress, Culture, Economy, Education, Elections, Energy, Environment, Health Care, International, Labor, Law, Media, Meta, National Security, Science, Transportation, or White House. If your diary is specific to a state, consider adding the state (California, Texas, etc). Keep in mind, though, that there are many wonderful and important diaries that don't fit in any of these tags. Don't worry if yours doesn't.

You can add a private note to this diary when hotlisting it:
Are you sure you want to remove this diary from your hotlist?
Are you sure you want to remove your recommendation? You can only recommend a diary once, so you will not be able to re-recommend it afterwards.
Rescue this diary, and add a note:
Are you sure you want to remove this diary from Rescue?
Choose where to republish this diary. The diary will be added to the queue for that group. Publish it from the queue to make it appear.

You must be a member of a group to use this feature.

Add a quick update to your diary without changing the diary itself:
Are you sure you want to remove this diary?
(The diary will be removed from the site and returned to your drafts for further editing.)
(The diary will be removed.)
Are you sure you want to save these changes to the published diary?

Comment Preferences

Subscribe or Donate to support Daily Kos.

Click here for the mobile view of the site