TM4SF4 and lung adenocarcinoma: Tumorigenic activity of TM4SF4 in lung adenocarcinoma cells was dramatically shown by xenograft assay; moreover, the growth of xenograft tumors was effectively suppressed by treatment with anti-TM4SF4 antibody, which suggests that anti-TM4SF4 antibody can be used for anti-cancer therapy of TM4SF4-overexpressing lung adenocarcinoma.