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The Eli Lilly & Company, the pharmaceutical company, stopped a study of its Xigris sepsis drug for children earlier this month after a preliminary analysis showed the medicine did not work and might increase the risk of bleeding.
Two weeks ago, researchers from the Ottawa Health Research Institute stopped a study of Trasylol in 3,000 heart bypass and valve surgery patients because although those given the drug bled less, they were half again as likely to die as those given two older alternatives.
In April, researchers stopped a study called FEM-PrEP that evaluated Truvada pills in nearly 2000 uninfected young women in South Africa, Kenya, and Tanzania after an interim analysis revealed that continuing was futile.
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The findings have led scientists at the Centers for Disease Control and Prevention to stop a study they had planned to conduct in Los Angeles and Miami among women at high risk for H.I.V.
In epidemiologic studies, costly or destructive laboratory tests or slow case accrual can make it desirable to stop a study early for reasons of efficiency.
Estimation of the conditional power (CP) is proposed as a decision tool to stop a study early or to continue it.
Independent data and safety monitoring boards will keep a close watch on the trials and review the blinded data as they come in; aside from side effects, a board can stop a study early if significant success surfaces or it becomes clear that the trial doesn't have the statistical power to provide a clear answer.
Similarly, stopping a study medication dose prior to closing enrollment is likely to impact recruitment.
Patients were contacted 30 days after stopping a study drug to record any adverse events that occurred after cessation.
However, the decision to stop a study early involves ethical, administrative, economic and not just statistical consideration.
SAEs that occurred on a study drug or within 30 days of stopping a study drug were considered as treatment emergent events.
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CEO of Professional Science Editing for Scientists @ prosciediting.com