TFRC and breast cancer: TFRC may serve as the suitable RG for detecting gene expression when concerning both breast cancer and adjacent tissues (GM = 1.19), though, GeNorm and BestKeeper indicated its instability (M = 2.364, SD = 4.30).<h4>Conclusion</h4>TFRC and 18S rRNA may be suitable RGs in breast cancer tissues, while all five candidates were not stable in adjacent tissues.