BIRC5 and colorectal carcinoma: The aim of the present study is to investigate the mRNA expression profile of the death receptor genes DR4 (TRAIL-R1) and DR5 (TRAIL-R2), as well as IAP genes cIAP1, cIAP2, XIAP and BIRC5/Survivin in CRC and normal tissue samples and to evaluate their potential diagnostic and prognostic significance, as well as their putative association with KRAS mutation status in CRC.