Just a quick update:
Greg had his blood test today to see if decreasing his medication would help him produce more white blood cells (WBCs). Unfortunately it didn't work, so he'll be going to the hospital tomorrow and either Monday or Tuesday for injections to hopefully stimulate his WBC production. We still don't know what would happen if that doesn't work - we're just taking it one day and one blood test at a time.
Hopefully you'll hear back from me with some good WBC news early next week!