TMPRSS2 and neoplasm: For example, the study of Liu et al.39found an elevated expression of TMPRSS2 in colorectal tumour and normal tissue samples, relative to other tumours, such as lung, oesophagus, stomach and liver; Bao et al.46revealed that the TMPRSS2 expression was considerably elevated in normal tissues than colorectal cancers using across several existing databases.