Previous studies of CaSR in cancer cell lines, including MCF-7 human breast cancer cells and AtT20 cells, have shown that CaSR switches from preferentially coupling to Gq/11 and Gi/o pathways to exclusively signalling by a Gs pathway (Mamillapalli et al. 2008, Mamillapalli & Wysolmerski 2010). The gene discussed is GNAI1; the disease is breast carcinoma.