Small extracellular vesicles and particles (sEVPs) derived from tumor-free pre-metastatic organs promote breast cancer metastasis and support organotropism Email 28 May 2025 52 Cheytan T, Schneider M, Würth R, Schwerd-Kleine P, Gutjahr E, Thewes V, Michel LL, Weber R, Vorberg T, Lohr S, Nitschke K, Neßling M, Lichter P, Schneeweiss A, Richter K, Helm D, Sprick M, Trumpp A.