In vitro, the observation that the conditioned medium of ISO-treated osteoblasts stimulated the migration of breast cancer cells, and that the RANKL decoy receptor osteoprotegerin (OPG) could block it, supported a stimulatory effect of βAR activation on breast cancer cell migration, via the upregulation of RANKL expression by the host stromal compartment [141]. The gene discussed is TNFRSF11B; the disease is breast carcinoma.