Antineuronal autoantibodies typically associated with post-ICI cerebellar ataxia include anti-Hu and anti-PCA2, among others, whereas antibodies predominantly associated with the idiopathic or spontaneous paraneoplastic cerebellar ataxia, such as anti-Yo, anti-Ri, and anti-DNER (Delta and Notch-like epidermal growth factor-related) are rarely detected in the post-ICI context [71,72]. Here, CASC19 is linked to cerebellar ataxia.