Sanger sequencing of a cohort of 64 choroidplexus tumors revealed somatic TP53 mutations in 50% of CPCsbut only 5% of CPPs [19], while other studiesreported somewhat lower (36%) [22] or higher (60%)[18] rates of somatic TP53 mutations in CPC. The gene discussed is TP53; the disease is choroid plexus neoplasm.