CD8A and incontinentia pigmenti: Kanai et al. also showed that the incidence and severity of ILD were significantly higher in those with pre‐existing IP.23 Therefore, further careful monitoring for ILD is needed during ICI treatment in patients with pre‐existing IP.Recently, Tanaka et al. examined the characteristics of CD8+ T cells in peritumoral pleural effusion and BALF from nivolumab‐induced ILD in metastatic kidney cancer patients.