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Most Recent DES Blog Posts
- New Online Global DES Health History Survey
- Five Scary and Shocking Facts about Diethylstilbestrol
- New Study Suggests Lifetime Risk of Adverse Health Outcomes for DES Daughters
- Historic DES Breast Cancer Court Cases
- Facebook issue – solved!
- Gender Identity and DES Exposure
- DES Sons Studies
- DES Sons Numbers and Health Concerns
- New AFSSAPS DES survey and update
- Distilbène®: 20 Years of Legal Battle
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Tag Archives: opinion
Five Scary and Shocking Facts about Diethylstilbestrol
1. As early as 1939, researchers had shown that DES Diethylstilbestrol could cause cancer and changes in the reproductive tracts of mice and rats, but drug companies ignored these results.

DES did not lead to healthier babies, nor did it prevent miscarriages, according to research that began appearing in 1953
2. In 1953, a study of 2000 women at the University of Chicago showed that DES did not prevent miscarriage; on the contrary, it was associated with increases in premature labor and a higher rate of abortions.
3. Despite this study, the drug continued to be used. It wasn’t until 1971 that American drug companies were legally obliged to label DES “unsuitable for pregnant women”. The FDA did not ban the drug but issued a contraindication which means that the drug DES continued to be prescribed to pregnant women even after the link between a rare form of vaginal cancer in young women and prenatal exposure to DES was established.
4. A whole generation of new medical students and doctors don’t know about Diethylstilbestrol, yet a study published in 2011 confirmed lifetime risk of adverse health effect in DES daughters (the youngest are in their mid 30′s early 40′s). DES is one of those cases where the patients often know more about its effects than the doctors.
5. DES is a multi-generational tragedy. Research by the Netherlands Cancer Institute in 2002 suggests that hypospadias a misplaced opening of the penis occurred 20 times more frequently among third-generation sons. In laboratory studies of elderly third-generation DES-exposed mice born to DES daughter mice, an increased risk of uterine cancers, benign ovarian tumors and lymphomas were found. Third-generation male mice were shown to be at risk for certain reproductive tract tumors.
Are we going to ignore these results like we did in 1939?
Third-generation children, the offspring of DES daughters and DES sons, are just beginning to reach the age when relevant health problems can be studied. Funding for more research is critically needed to continue to look for evidence of reproductive abnormalities and cancers among third-generation DES women and men to ensure they receive appropriate follow-up care.
New Study Suggests Lifetime Risk of Adverse Health Outcomes for DES Daughters
A study published on October 06th, 2011 in the prestigious New England Journal of Medicine tallies the risks of diethylstilbestrol related disorders among women whose mothers took the synthetic hormone during pregnancy, compared to others who weren’t exposed.

New study suggests that women exposed to DES are 82% more likely to develop breast cancer after age 40
Among these health risks, the study suggests that women exposed to diethylstilbestrol, commonly called DES daughters, are 82% more likely to develop breast cancer after age 40.
Overwhelmed by the extensive media coverage that the publication of this study sparked in the USA, Canada, Australia and France but upset by the total absence of information in the UK, I contacted a health journalist at the UK Press Association to request for this information to be made available to the general public and widely shared and circulated in the UK press.
Given that October is Breast Cancer Awareness Month and 2011 marks the 40th Anniversary of the DES cancer link, I am hoping that my emails to the Press Association won’t go unnoticed and will grab the attention of UK journalists.
Findings of the DES Study
As part of this new study, researchers at the National Cancer Institute analyzed data from three separate studies that have followed more than 4,000 DES-exposed women since the 1970s. Compared with a control group of unexposed women, DES daughters were found to have higher rates of infertility (33% versus 16%), miscarriage (50% versus 39%), preterm delivery (53% versus 18%), and ectopic pregnancy (15% versus 3%). The DES-exposed women were also 82% more likely to develop breast cancer after age 40, and more than twice as likely to experience menopause before age 45. For most of the health conditions included in the study, the increase in risk was even greater for DES daughters who had been exposed to especially high doses of the drug.
“Our study carefully documents elevated risk for DES-exposed daughters for a host of medical problems — many of them also quite common in the general population,” said study author Robert N. Hoover, M.D., director of the Epidemiology and Biostatistics Program in NCI’s Division of Cancer Epidemiology and Genetics. “Without the sentinel finding of a very rare cancer in young women, and without the sustained follow-up of those who were exposed, we would not know the full extent of harm caused by DES exposure in the womb.”
Many of the potential health complications identified in the new study have been raised in previous research, in some cases with conflicting results. A 2010 study of DES daughters conducted in the Netherlands, for instance, found no link between exposure and breast-cancer risk. However a 2006 study had already suggested a higher risk of breast cancer in DES daughters. This year (2011), fifty-three DES daughters who developed breast cancer have brought a lawsuit against several DES manufacturers; the lawsuit is currently under way in Boston, USA.
What the study doesn’t mention is the health risks for DES sons. Despite the fact that women who have been prescribed diethylstilbestrol during pregnancy gave birth to as many sons as daughters, DES sons have once again been left out from a research study. Why researchers fail to include all those who have been affected, men and women? To me, we will never truly understand the extent of the DES tragedy if we don’t take a comprehensive and global approach to the problem. So even though, I welcome this study the need for more research remains obvious.
Situation in the UK
According to the support group DES Action UK who unfortunately is no longer active, more than 300,000 people in the UK (5 to 10 millions worldwide) have been exposed to diethylstilboestrol. So why countries like the UK fail to inform the general public about such an important study?
DES was prescribed to pregnant women in the UK between around 1950 and 1975, mainly to prevent miscarriage. This was despite the fact that research published in the American Journal of Obstetrics and Gynecology in 1953 revealed that women receiving DES suffered a higher rate of miscarriage. The synthetic estrogen was developed in England in 1938. It wasn’t patented and went on to be produced by more than 200 companies. In the UK, DES was known as Stilboestrol® and was sold under many brand names.
Yet, the DES tragedy remains largely unknown in the UK. Some British doctors have never heard of DES and there is only one dedicated clinic in Europe, based in Ireland. Many women are unaware that their infertility or cancer is a result of their mother having taken the drug. All of these women are not receiving proper medical treatment, or making truly informed decisions about their healthcare, as a result.
As a DES daughter myself I have reason to be interested in this new report in the New England Journal of Medicine that takes a thorough look at the heightened medical risks associated with prenatal DES exposure. And I am sure I am not the only one in the UK who feels the same. Despite overwhelming evidence of numerous health risks associated with DES exposure nobody seems to care in the UK. Media interest in the DES issues would definitely help to reach out to all those affected but unaware that their health problems may be related to Stilboestrol®.
The lack of UK media coverage on this new important study just shows how thick the wall of silence around the DES issues in the UK is. To share my experience and knowledge of this drug, I started this personal blog earlier this year for DES mothers, daughters and sons, and others interested in the DES issue. But this is a drop in the ocean. I need support from the media to reach out to people who may have been exposed. I sincerely hope the UK will show an interest in this study and will take on this opportunity to break the wall of silence.
Gender Identity and DES Exposure
Several published studies in the medical literature on psycho-neuro-endocrinology have examined the hypothesis that prenatal exposure to estrogens (including Diethylstilbestrol) may cause significant developmental impact on sexual differentiation of the brain, and on subsequent behavioural and gender identity development in exposed males and females. There is significant evidence linking prenatal hormonal influences on gender identity and transsexual development.

There is a possible connection between DES exposure and gender variance
In 1999, Dr. Scott Kerlin (founder of the DES Sons International Network) began researching the effects of Di-Ethyl Stilbestrol® on the health of genetic males who had been exposed prenatally. A substantial amount of research had been done on women who had been exposed but relatively little had been done on men and DES sons. When it became apparent that a significant portion of his research group were either transsexual, transgendered or intersexed, he began to explore the possibility of a connection between prenatal DES exposure and gender variance. Dr. Kerlin is not the first researcher to note a correlation between DES exposure and feminized behaviour in genetic males; studies go back as far as 1973. However, Dr. Kerlin has delved much deeper than those who came before.
Radio Interview: DES Exposure and Gender Variance
Listen to KWMR Radio Interview with Dr. Dana Beyer on the side effects of Diethylstilbestrol and its influence on gender identity
Audio clip: Adobe Flash Player (version 9 or above) is required to play this audio clip. Download the latest version here. You also need to have JavaScript enabled in your browser.
Dr. Dana Beyer is the medical advisor and web manager of the DES Sons International Network, on the effects of endocrine disrupting compounds such as Diethylstilbestrol, DDT, phthalates and bisphenol A, on human sexuality and reproduction, as well as providing personal support and mentoring. In 2005 she presented a breakthrough paper, with her colleagues Dr. Scott Kerlin and Dr. Milton Diamond, to the International Behavioural Development Symposium, delineating the impact Di-Ethyl Stilbestrol® has had in causing intersex and gender variations in human beings.
I understand this is a sensitive and controversial matter but I feel it is important to bring this issue to light and break the wall of silence around what is still nowadays considered as “taboo”. I would like to invite all DES exposed individuals who have a knowledge of DES exposure and gender identity either through research or personal experience to share their comments and stories.
Take the survey: DES Sons – the Truth and the Unknown
Sources: DES Sons International Network, TransAdvocate.org
New AFSSAPS DES survey and update

AFSSAPS offices - 2011 DES survey and update
Between 2010.09.10 and 2010.10.10, the National French Agency for the Safety of Health Products (AFSSAPS) conducted a DES survey aimed at assessing the knowledge of gynecologists and obstetricians regarding the complications associated with Dietylstilbestrol exposure as well as evaluate their expectations in terms of information campaign about this issue.
This survey was conducted in collaboration with the French National Federation of Medical Gynecology Colleges, the National College of French Gynecologists and Obstetricians, and the French Company and Gynecology Group for the Study of In vitro fertilization in France.
A total of 204 completed questionnaires were returned. Gynecologists who responded were generally aware of the consequences of DES exposure with 71% of them having at least one patient exposed to Diethylstilbestrol in utero.
AFSSAPS DES survey results
Analysis of the responses regarding the level of knowledge about DES exposure suggested that:
- A majority of practitioners have an imperfect / limited knowledge of its consequences
- Investigating DES exposure in situations which suggests potential exposure is not systematic
- Genital anatomic abnormalities in boys exposed in utero are not well known by gynecologists
- Knowledge of the risks faced by the third generation is very limited, yet it is important to continue monitoring these children to assess the multi-generational effects
- The “memory” of the consequences of DES exposure is lost with the new generation of doctors
- Recent data on the third generation is largely unknown
- Almost half of the practitioners who responded requested a new DES information campaign
AFSSAPS DES update June 2011
As a result of the 2010 survey, AFSSAPS decided to publish a DES update aimed at DES exposed individuals and health professionals. The publication released in June 2011 emphasizes the gynecologists and obstetricians’ crucial role in recognizing DES exposure, informing their patients about its consequences and referring them to specialists for adequate care and monitoring. It also highlights the crucial role of DES patients in handing down the “record” of their exposure to the next generations.
The AFSSAPS 2011 DES update covers the following topics:
- DES historical facts
- Current issues
- Risks associated with DES exposure
- Breast cancer risks
- Post adolescent psychiatric disorders – Later this year AFSSAPS plans to conduct a public hearing for experts to reexamine their facts on this matter.
- Risks for the 3rd generation
- How to screen DES exposure
- Routine medical follow-up
- Recommendations for fertility problems
- DES pregnancy care
As a DES daughter and mother of 3 girls who may also be affected (only time will tell …), I really welcome these efforts from AFSSAPS and I believe this is a very important document which will serve as a reference for years to come. The results of the survey and the update are available to download from the AFSSAPS website in French. AFSSAPS is circulating this information through professional organisms to reach out to health professionals.
I sincerely hope AFSSAPS and the French government will follow through with additional efforts to spread the word, and reach out not only to all doctors, but also to the general public. With the recent Mediator scandal maybe AFSSAPS doesn’t want to make too much noise about the DES tragedy but at the end of the day it is our health and our children health which are at stake and we have the right to know.
AFSSAPS Downloads
The AFSSAPS DES Update 2011 was promised by one of their doctors who attended the DES conference in Paris in November 2010. It is very widely based on the Réseau DES France publication which followed the conference. It is an official text for gynecologists, obstetricians and doctors. The English translation has been coordinated by Réseau DES France and reviewed by Carol Devine (DES Australia NSW), Pr Tournaire and myself.
Thanks go to Pam Solere for her trust and encouragements.
Can the Mediator scandal lead to justice for drug victims ?
The drug Mediator remained on the market from 1976 until 2009 when the risk of fatal heart disease was known since the 1990s. French health experts now believe that Mediator developed for treating overweight diabetics, could have killed between 500 and 2,000 people before it was finally banned.
It stayed on the market despite a succession of warnings over its side-effects, which include heart valve disease and pulmonary hypertension. It was also hugely misprescribed, with doctors routinely handing out Mediator as an appetite-suppressant for people with common or garden weight problems.
A compensation fund was established by the French state for victims. But Mediator is not the first drug scandal!
Below is a translated article from Anne Levadou, President of Réseau D.E.S. France published in the Independant Web Newsletter “Rue 89″, June 08th 2011.
In order to avoid any major reform, the government is trying to convince us that the present Mediator scandal is the first major medical disaster. But let’s not forget that this is far from the first one : Thalidomide, Distilbène® came before Mediator… with every specific crisis, our society tries in the best of cases to find some specific reply. At the worst, to forget it.
Health precedents
The incoherence in dealing with health disasters leads to injustice and discrimination. The massive media coverage of the Mediator affair is parallel to the silence surrounding other victims. The denial of justice is not acceptable, for example, for the victims of Distilbène®, while this DES example is taught as a “model” of the mistakes not to be made.
Distilbène®, massively given to pregnant women until the 80s (1977 in France), has the perverse impact of not only affecting the women taking it, but even more affecting their children, and even grandchildren.
Let’s not forget also the victims of Lyell and Stevens-Johnson syndromes, rare reactions to drugs, leading to major damage to the skin and mucous membranes. It is inadmissible that all these victims – because their pathology is due to some other drug – should be “forgotten” and receive no compensation.
For the victims : a struggle against obstacles
Having no other choice, all these victims have to support, at their own costs and in media silence, years of personal procedures, medical examinations and cross-examinations in order to hope at the end to receive some recognition of the pharmaceutical company’s responsibility and some compensation for their injuries. At the issue, some discover that, because the risk was mentioned on the leaflet, that they have no legal recourse and their case is rejected.
However, as for Mediator, the serious effects have been proved. The permanent damages on health are the results of drugs or treatment approved by the official sanitary and political administrations and financed by the collectivity. Drugs represent an undeniable progress in our society, and the pharmaceutical industry contributes to the national wealth, but the serious side effects are in balance with the benefits made.
A “mutual pooling” of risks would be logical
Why not to-day, use the Mediator case to move towards a general response on the principle of global responsibility linked to the risks of taking drugs? The government must use this scandal as a lever to progress towards some definitive social solution to what is proved a collective risk.
The profits for pharmaceutical companies from the commercialization of a drug is assured by the solvency of the National Health Service which is itself financed by health insured tax payers. In the same way as professional risks, the costs of compensation for the victims could be automatically paid by the industries creating the risk. The mutual pooling of a collective risk, by the pharmaceutical companies concerned, would offer a double advantage : guaranteeing rapid compensation for the victims, but also, encouraging these companies to develop prevention measures.
The dissuasive effects of “class actions”
The Mediator scandal should also lead towards the possibility for victims to take collective legal action. The absence of collective procedures (“class action”) results in unfair personal struggles. While the victims of medical scandals are hoping for collective replies, why was this subject completely absent from the recent Drug Survey Symposium? It is certainly interesting to talk for hours about the code of ethics for drug representatives, or about providing doctors with updated information : whereas there would be an immediate auto-regulation effect from the sword of Damocles effect of “class actions” on pharmaceutical companies.
There is now an open choice : either our society offers a definitive response concerning the responsibility of drugs, or we will once again discover in a few years, or even in a few months, yet another drug scandal. As victims and citizens, we are expecting a wide-scale reaction and a truly political solution. Without this, Mediator will simply remain just another scandal.
Sophie Le Pallec, President of Amalyste association
Anne Levadou, President of Réseau D.E.S. France
Jean-Pierre Sueur, Senator of Loiret, France




the uncanny similarity in the worded government responses to DES Action UK and DES Action Australia-NSW.















