SQSTM1 and cancer: Additionally, a recent study has shown that tumor‐derived exosomes, which are enriched with five autophagy‐related proteins (LC3B, CK2, RAB7A, SQSTM1, and UB) and are secreted by breast cancer cells shown the ability to activate autophagy in normal epithelial breast cells,156 resulting in the release of cancer cell growth‐promoting factors, establishing a tumor microenvironment that is suitable for the proliferation of cancer cells.157