But definitive results are unclear.
There were no immediately definitive results.
Definitive results are not expected before Monday.
"We regret that the settlement talks have failed to produce definitive results," Mr. Rebell said in a statement.
The definitive results of a larger study of solanezumab will be published at the end of 2016.
Those results are expected Tuesday or Wednesday, though definitive results are expected to come from labs in the United States.
It could be weeks before definitive results from a toxicology report are available.
Definitive results could take weeks to emerge, giving ample opportunity for vote-padding and shaving.
Both were early studies, and researchers emphasized that more definitive results would come from larger, longer studies that were under way.
More definitive results will come in 2005, when results from the first large-scale, long-term study of hormone use become available.
The closely watched national legislative election in Zimbabwe drew a huge turnout of generally peaceful voters, but definitive results were not expected until today at the earliest.
