ERBB2 and breast cancer: In particular, Altelaar’s group successfully identified exosome proteomes from cell lines mimicking triple-negative (BT-549, Hs578T, LM2, MDA-MB-231), HER-2-positive (HCC1419, HCC1954, JIMT1, SKBR-3), and luminal A (MCF-7) BC subtypes [29], identifying 4648 proteins.