TCF7L2 and colorectal carcinoma: One curious case of chimeric sequence, identified in the CRC cell line FRI, was a fusion transcript spanning three genes in a non-canonical genomic order, joining TCF7L2 exon 4 with VTI1A exons 5, 6, and 7, and further extending into RP11-57H14.3 exons 1, 2, and 3.