BACH2 and skin basal cell carcinoma: A particularly interesting TReg-BCC susceptibility gene identified here as a GWAS locus and an SMR-HEIDI eQTL and mQTL gene is BACH2. BACH2 has been linked to B cell lymphoma, CML, and stomach cancer [40–42] and has also been shown to be required for efficient formation of TRegs [43].