To further investigate the role of ERRγ in SCLC metastasis, we established a metastasis model by tail vein injection of tumor cells (Ko et al, 2021; Kuramoto et al, 2012; Sakamoto et al, 2020; Sato et al, 2013; Wang et al, 2020). The gene discussed is ESRRG; the disease is small cell lung carcinoma.