Washington, Feb 08: Injections of a progesterone type hormone may be able to prevent more than a third of pre-term births in women with a history of giving early birth. "The evidence of this treatment's effectiveness was so dramatic, the research was stopped early", said Paul J Meis, the national principal investigator and a professor of obstetrics and gynecology at Wake Forest University. "This drug is readily available and can be used by doctors to improve outcomes for mothers and babies", he added.