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Extracellular vesicles (EV’s) are membrane surrounded structures released by different cell types and are emerging as potential therapeutic and diagnostic targets in cancer. In the present study, plasma samples derived from 7 patients with metastatic and non-metastatic ER+ (estrogen receptor positive) breast cancer (BC) were collected and their respective (EVs) isolated and the protein content analyzed by mass spectrometry and FunRich analysis. Here we report on the presence of  two putative plasma EV biomarkers (which were absent in healthy controls samples) that could be used to detect early ER+ breast cancer and for those with lymph node (LN) involvement However, given the preliminar nature of the work, further investigation in a larger patient cohort is warranted to corroborate these findings. If confirmed, these biomarkers could be incorporated into simple blood test kit for the early detection of those with ER+ breast cancer and lymph node involvement.

Blood-derived extracellular proteins as potential biomarkers for the diagnosis of early ER+ breast cancer and detection of lymph node involvement