"Cure" here means any treatment that can change someone's personality such that they're no longer diagnosed as schizophrenic, or can prevent a newborn from being diagnosed. (Must be an actual change to the person, not a change to the diagnosis criteiria.)
Doesn't need to be widely available or approved by any regulatory agency, just needs to exist and be shown to work without any significant doubt on the matter.
An active brain device would count. Embryo selection would not count, since that's just "choosing a different person".
Nice question! Some pedantic questions:
I would presume that a 'cure' means that the treatment (if pharmacological) can be discontinued and a reasonable proportion (perhaps a majority) of those who were 'cured' will not have to take the treatment again and will not relapse. Would you agree?
If non-pharmacological, like a deep brain stimulation device, I think you should clarify if it would be a 'cure' if it had to remain active to maintain remission.
Would you accept embryo selection as a 'cure' if it can reliably select against schizophrenia, or does this not count? It is not a 'change to the person', more a 'change of person'.
Could you also please clarify your threshold for believing if a cure has been developed, eg will it need to have been approved for treatment of schizophrenia by a reputable medical regulatory authority? What standard of study would need to be done to additionally show that it was also 'curative'?