CYP4V2 and Friedreich ataxia: These include MEX3C, ADNP2, ME2, ELAC1, and UFSP2. The CYP4V2 on chromosome 4 and EXOC2 on chromosome 6 were also among the top expression-copy number correlated genes, which showed overall deletion in FA-HNSCCs (Fig. 4a, Supplementary Fig. 1b).