SIGMAR1 and lung cancer: A few researches suggested that Sigmar1 was highly expressed in breast and lung cancers, and there was a positive correlation between Sigamr1 expression and the cancers’ prognosis and invasive ability (Simony‐Lafontaine et al, 2000; Wang et al, 2004; Mir et al, 2012; Gueguinou et al, 2017).