We further verified these observations with multiple cell lines: SKOV3 cells, an ovarian cancer cell line that constitutively expresses IDO1 (Figure 3D), HT1080 cells, a human fibrosarcoma cell line frequently used in ferroptosis studies (Figure 3E) and PT45 cells, an aggressive pancreatic adenocarcinoma epithelial cell line (Figure 3F). This evidence concerns the gene IDO1 and pancreatic adenocarcinoma.