ESRRA and breast cancer: This network has emerged as an important nuclear transcriptional axis and metabolic signaling pathway in regulating metabolic adaptation in specific cancer types, including breast cancer, prostate cancer, and melanoma.12 A majority of the literature has described the function of the founding members of the co-activator family, PGC-1α and ERRα, as a pivotal axis that might be linked to metabolic addiction of specific cancer cells that rely on mitochondrial metabolism for survival.