In previous breast cancer studies, commonly used RGs included beta-actin (ACTB), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), beta-glucuronidase (GUSB), ribosomal protein L13a (RPL13A), and tubulin alpha 1a (TUBA1A) [3, 9]. Here, ACTB is linked to breast cancer.