YBX1 and breast cancer: YB1 can bind to the promoter region of cytidine nucleotide triphosphatase (CTPS1) in triple-negative breast cancer (estrogen receptor-deficient, progesterone receptor-deficient, human epidermal growth factor 2-deficient) cells and activate CTPS1 transcription, increasing CTPS1 expression, and thereby promoting breast cancer proliferation and metastasis (85).