Indeed, we found that samples in cluster Carcinoid B were characterised by high levels of the CYP family of genes, and a very strong expression of several UDP glucuronosyl-transferases UGT genes (median FPKM = 4.6 in UGT2A3 and 28.1 in UGT2B genes; Fig. 4d), which contrasts with the low levels in other carcinoids (median FPKM = 0 for both UGT2A3 and UGT2B; Fig. 4d), LCNEC (median FPKM = 0 and 1.2 for UGT2A3 and UGT2B; Supplementary Fig. 20) and SCLC (median FPKM = 0 and 0.3 for UGT2A3 and UGT2B; Supplementary Fig. 20). This evidence concerns the gene UGT2A3 and small cell lung carcinoma.