If the trial is halted, study drug is not administered to any additional subject and enrolment stops until the DSMC has reviewed the events.
The majority halted study treatment for progressive disease, while only 7% were discontinued due to toxicity in the abiraterone acetate arm, and 5% in the placebo arm [ 52].
A number of these amendments -- including one that would halt studies on the feasibility of tearing down several dams in the Pacific Northwest, a move championed by environmentalists to allow salmon a free run to their upstream spawning areas -- have been pushed by Senator Slade Gorton, Republican of Washington, who is locked in a tight re-election contest.
On 10 May, the Office for Protection from Research Risks OPRRR), an agency of the Department of Health and Human Services that protects the rights of human volunteers in research, ordered Duke to stop enrolling new patients temporarily and to halt studies that do not directly benefit patients.
Judgment of the scientific community is necessary to decide whether to halt studies at this level or, if significant effects and consensus of the scientific community indicate, then to design an in-depth study (etiologic research) ("Ecologic analyses" in Figure 1).
Joseph R. Vietri, the Army Corps deputy chief of planning for the New York district, said at the meeting that the corps had halted work on the study until the state paid its $1.8 million share of $7.4 million needed to complete it.
The agency said "a critical question" remained: whether the halted study would also foretell problems with those patients who took Multaq for the approved uses.
In the latter study, progression of tumours directly required EGR1, and was halted in studies involving EGR1−/− knockouts.
In 2003 Johnson & Johnson halted several studies of Procrit in cancer patients after they developed a higher-than-expected number of blood clots.
Nonetheless, they said they had temporarily halted any studies involving drugs the agency had not approved for experimental use until they consult with the agency.
