GAPDH and breast cancer: The relative expression of lncRNA00544 was further analyzed in 49 paired breast cancer tissues and matched metastatic axillary nodes by qRT-PCR normalized to GAPDH. LncRNA00544 expression was significantly higher in metastatic axillary nodes compared with breast cancer tissue (p = 0.0186, Fig. 1B), and especially in the luminal BC subtype (p = 0.011, Fig. 1C).