My interpretation is that it hasn't been dropped, but was stopped because of a water contamination problem with the supply of AA4500. The trial is stopped until the problem is solved and the FDA gives approval to go ahead. I'm not an exper or and insider but I'm guessing this could take months. Whether the trial could be simply restarted after that time I don't know. If the delay is too long, it might invalidate the results already obtained and make it necessary to start over.
On the other hand maybe the problem can be quickly resolved and the trial will continue from where it left off.