"Here the mechanism by which norepinephrine (NE)regulates prostate cancer DTCs in the marrow is explored. NE directly stimulated prostate cancer cell proliferation through beta2-adrenergic receptors (ADRB2).. NE also altered prostate cancer proliferation in the marrow niche by indirectly downregulating the secretion of the dormancy inducing molecule growth arrest specific-6 (GAS6) expressed by osteoblasts."xsd:string