Among the 206 BCC-specific clusters, we chose a cluster, namely number of 2591 of ribB genes encoding a 3,4-dihydroxy-2-butanone 4-phosphate synthase (EC 4.1.99.12)/GTP cyclohydrolase II, which shows >92% sequence identity, and four completely conserved sequence regions (≥20 bp) for designing BCC-specific LAMP primers (Supplementary Table S2). Here, RIT1 is linked to skin basal cell carcinoma.