We further confirmed the hypoxic state of cancer cells within the tumor section, indicated by the elevated fluorescence of the fluorescent oxygen sensor particles compared to the no-cell control (Figure 4E), as well as the enhanced expression of glucose transporter-1 (Glut-1) in the embedded SKOV3 cancer cells compared to the normoxic counterpart (Figure 4F). This evidence concerns the gene SLC2A1 and cancer.