GAS6 and lung adenocarcinoma: Consistent with previous reports, we identified some cell lines that had constitutive Axl activation (i.e. JRMNB) as well as other cell lines that had Gas6-inducible Axl activation, most notably the triple-negative breast adenocarcinoma MDA-MB-231 and the lung adenocarcinoma H1299 (Fig. 3A).