We also reclassified the ERCC6 (c.2291 T > C; p.(Leu764Ser)) variant in patient P7 carrying a deletion of ERCC6 on the other allele and a clinical diagnosis of late onset Cockayne syndrome; of note, Ghai et al. described a patient affected with Cokayne syndrome carrying almost the same deletion as P7 associated to a splice variant [66]. This evidence concerns the gene ERCC6 and Cockayne syndrome.