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There has been no scientific literature published on this specific topic. The lack of interest/will so far is surprising in view of increased concerns about chemicals that bind to oestrogen receptors in humans and animals.
Details for DES Sons International: http://groups.yahoo.com/group/des-sons/
Reference for this blog item: The Riddle of Gender: Science, Activism, and Transgender Rights (p 16,17) 2005, Deborah Rudacille ISBN 0-375-42162-9.
As part of DES Awareness Week June1-7 in 2011, DES Action Australia-NSW sent DES information to transgender and LGBT groups and publications in Australia. As a result, it was learned that DES was also given to people undergoing sexual transition male to female. Questions have now been raised regarding possible long-term risks of this DES usage.
NOW READ ABOUT DEX
There is controversy about the off-label usage of the drug dexamethasone during pregnancy, and in particular for women at risk for having a child with Congenital Adrenal Hyperplasia (CAH). CAH can cause ambiguous genitals and atypical sex anatomy in females. Dexamethasone is thought to reduce the odds of virilisation occurring. See article http://www.theatlantic.com/health/archive/2013/01/ivf-on-steroids-the-dangerous-off-label-use-of-dex-during-pregnancy/267187/#.UPbCw9dEASQ.facebook
UPDATE 11/8/13
Listen to "Letter from a DES Survivor", by Larry Murphy, a DES Son Testimonial on @SoundCloud:
DES Son Testimonial