Paraneoplastic Cerebellar Degeneration, also known as rapidely progressive cerebellar syndrome, is related to cerebellar degeneration and small cell cancer of the lung, and has symptoms including cerebellar ataxia An important gene associated with Paraneoplastic Cerebellar Degeneration is CDR2 (Cerebellar Degeneration Related Protein 2), and among its related pathways/superpathways is PKC-gamma calcium signaling pathway in ataxia. Affiliated tissues include breast and lung.