BACH1 and neoplasm: The tumor microenvironment (TME) includes cancer cells, non‐malignant cell types, and altered extracellular matrix.[291] The immune response in TME is necessary for cancer growth and advancement.[292] In TME, tumor cells can manipulate the activity of immune cells, suppress the attack of immune cells on cancer cells, and evade immune surveillance by the body.[293, 294] BACH1 has been increasingly recognized for its involvement in tumor immunity.[295, 296] BACH1 is strongly expressed in many cancers, often correlating with bad prognosis.