CD8A and neoplasm: Previous studies have shown that ferroptosis is closely related to tumor immunity (Xie et al. 2016; Tang et al., 2019), but direct evidence of the connection between ferroptosis and antitumor immunity was not available until Wang et al., 2019a reported that CD8+ T cells induce ferroptosis in tumor cells in vivo (Wang et al., 2019b, Green et al., 2019).