The gene expression of retinoic acid receptors, namely, <i>RXRA, RARA, RARG, RORA;</i> the fibrosis marker <i>TGFβ</i> and its receptor <i>TGFβRII</i>; the transcription factors <i>PPAR-γ, STRA6</i> and <i>Stat3</i>; the enzymes aldehyde dehydrogenase (<i>ALDH1a1</i>), alpha-1 antitrypsin (<i>A1AT</i>); and the Cyp genes <i>Cyp26a1</i> and <i>Cyp26b1</i> were assessed by quantitative PCR in patients with SJS pre-mucous (n = 34) and post-mucous membrane graft (MMG) intervention (n=19) in comparison with age-matched/sex-matched healthy controls (n=20).