To examine GMFG expression in all the subtypes of breast cancer tissues, we used IHC to detect the protein levels of GMFG in 31 Luminal A, 28 Luminal B (Her 2−), 27 Luminal B (Her 2+), 34 Her-2+, and 37 TNBC primary breast cancer tissues. This evidence concerns the gene GMFG and breast cancer.