KRAS and colorectal carcinoma: RT-qPCR of mutant (MUT)-KRAS CRC biopsies and their adjacent normal tissues showed that nearly 67.69% (44/65) of the paired tumor tissues showed the significantly higher expression (T/N > 1.5-fold) of circIFNGR2 (P < 0.05, Additional file 5: Fig. S4a).