Long non-coding RNAs were the primary focus in ten studies, including IL21-AS1, AC007278.2, IFNG-AS1, LINC01882 and the X-chromosome transcripts XIST and Flicr (4, 13, 42, 52, 58, 60, 64, 70, 73, 80), whereas three reports concentrated on circular RNAs such as circ_003912 in erosive oral lichen planus or mixed circRNA/miRNA signatures in Vogt-Koyanagi-Harada disease (23, 53, 77). This evidence concerns the gene IL21 and oral lichen planus.