To further assess the effects of loss of YB1 expression on tumor growth and metastasis of TNBC cells in vivo, mammary fat pads of female Balb/C mice were inoculated with parental syngeneic 4T1 TNBC cells or their YB1-KO derivatives, and tumor growth was assessed over 5 weeks. Here, YBX1 is linked to neoplasm.