ITPR1 and cerebellar degeneration: In addition, numerous other antibodies are being studied to establish and better characterize their association with paraneoplastic cerebellar degeneration, among them PCA-2, Anti-mGluR1, Anti-Tr PCD, Anti-Ca/ARHGAP26, Anti-CARP VIII, Anti-PKCγ, Anti-Nb/AP3B2, Anti-Sj/ITPR1, Anti-CASPR-2, and Anti-neurochondrine.