Also, if the drug does not work as well as expected, any results may never see the light of day.

The searches I did turned up lots of information about rodent experiments, but nothing much about results in people. Of course it is possible that I missed something on a quick search. If the results so far area all in rodents, then the prediction of a marketable drug in 5-7 years may be optimistic.

In any event, even if the experiments on people go well it usually takes months to run the experiments, analyze the data, and present the data for peer review.