YBX2 and breast cancer: Additionally, we analyzed mRNA levels of YBX family members including YBX2 and YBX3 in breast cancer patients, and results showed that YBX2 mRNA levels showed no difference between TNBC and non-TNBC patients, while YBX3 was upregulated in TNBC patients compared to the non-TNBC group (Figure 4C).