Representative immunohistochemical images further confirmed that the protein expression levels of ACADS, ARMCX1, ETFDH, HIBADH, IMMP2L, NIPSNAP3B, and OXCT1 were significantly downregulated in BC tissue, whereas GSR, SDSL, SFXN1, and SFXN2 were upregulated. Here, ETFDH is linked to breast cancer.