For the last few years I've been keeping an eye on Geneuro [1]. They're trialling a HERV-W antibody on the theory that this endogenous retrovirus triggers an immune reaction in the brain that causes multiple sclerosis. Schizophrenia may also share a similar etiology [2]. When/if it does get approved for MS, I will be asking if it can be tried off-label on my brother with schizophrenia (although of course it may be too late now anyway, 15 years after his diagnosis).