Data on GPX4 expression levels in DLBCL, including tumor tissues, peripheral blood, and single cells, were retrieved from several databases, e.g., GEO, and correlation analysis was performed that resulted in the following findings: high expression of GPX can inhibit DLBCL cell proliferation; negative correlation exists between GPX expression and 16 core pathogenic genes; and GPX4 is a candidate biomarker that deserves further exploration in DLBCL [307]. This evidence concerns the gene GPX4 and diffuse large B-cell lymphoma.