VAMP3 and chronic myelogenous leukemia, BCR-ABL1 positive: In addition, other studies found that VAMP‐7, but not VAMP‐3, is essential for exosome secretion in K562 human chronic myeloid leukemia cells (Fader et al., 2009), which aligns with our identification of VAMP‐7 as the R‐SNARE that mediates exosome secretion in tumour cells.