For tumor‐associated EVs (tEV), we tested the capture efficiency of four cancer cell membrane‐specific antibodies: EGFR, EpCAM, ROR1, and DLL3.[52, 53, 54, 55] Although EGFR is highly upregulated in many cancer types, it was inefficient for sorting SCLC EVs and quantifying DLL3 protein (Figure S3B, Supporting Information). Here, EPCAM is linked to small cell lung carcinoma.