IL6 and posterior cortical atrophy: Furthermore, as shown in the Table 5, the maximum levels of expression were seen for the ROS (P < 0.0001, fold change: 7.5), RNS (P < 0.0001, fold change: 2.6) and IL-6 (P < 0.0001, fold change: 2.51) in the PCa group positive for HPV compared with the PCa group negative for HPV.