Thanks for posting this new information. Most of us can only imagine what it is like to have a close family member impacted by PDD. It is a tough-tough diagnosis to live with. Any positive news (like this) presents a glimmer of hope and relief. An Irish expression comes to mind..."All the Best".
And then AFTER Drug Holiday when they were again allowed to have the drug DOWN goes the CHART = EXCELLENT their dementia is disappearing.