PDCD6IP and breast cancer: Thus, we isolated the PS-BC and PR-BC cell-derived exosomes (PS-BC-exo and PR-BC-exo), which were photographed by EM (Supplementary Figure 1A), and the following Western blot analysis results validated that the exosome-associated biomarkers (Alix, HSP70 and TSG101) were enriched in those exosomes (Supplementary Figure 1B).