YBX1 and breast cancer: Moreover, tRFs, which are derived from tRNAGlu, tRNAAsp, tRNAGly, and tRNATyr, compete with Y-box-binding protein 1 (YB-1) for an endogenous oncogene transcript, disrupting the stability of proto-oncogene transcripts, and reducing the expression of proto-oncogenes resulting in suppression of breast cancer progression [78].