For focus score, qPCR validation showed the expression of CCR7/CCL19 in pSS cases with focus score ≥1 was higher than that in pSS cases with focus score <1, although this difference was not statistically significant (P = 0.054 for CCL19, P = 0.2 for CCR7; Supplementary Figure 2A). This evidence concerns the gene CCR7 and peeling skin syndrome.