ADRB2 and cancer: C‒X‒C motif chemokine receptor 4 (CXCR4) is a promising target for anti‐cancer therapy, and it has been found that β2‐AR can bind to CXCR4 and that CXCR4‒β2AR heteromers are present in human cancer cells, which might help to develop targeted therapeutics for the treatment of CXCR4‐positive cancer drugs.333