BIRC5 and colorectal carcinoma: MiR-218-5p was found to be downregulated in primary CRC tissues and its expression in CRC cell lines was significantly decreased after treatment with 5FU, while ectopic overexpression of miR-218-5p directly suppressed BIRC5-encoded Survivin as well as indirectly decreased TS levels through an unknown molecular mechanism (Li et al. 2015b).