PTCH1 and colorectal cancer: A separate pathway over-representation analysis for genes from clusters that contained SNPs associated with height or colorectal cancer risk, indicated that the Ihh signalling pathway (BMP2, PTCH1) (p-value = 2.81 × 10−4) and signalling in basal cell carcinoma (BMP2, PTCH1) (p-value = 2.53 × 10−4) (Table 2) were overrepresented.