EPCAM and breast cancer: Through integrated analysis of previously published breast cancer CTC qPCR data [98], melanoma CTC transcriptome sequencing data [99], and colorectal cancer and prostate cancer microarray data [100], AGR2, CEACAM5, CLDN3, CK18, EpCAM and FGFR3 were found to be commonly differentially expressed between CTCs and primary tumors [101].