https://www.annualreviews.org/doi/full/10.1146/annurev-cancerbio-041916-065808 The Two Faces of Reactive Oxygen Species in Cancer Reactive oxygen species (ROS), now appreciated for their cellular signaling capabilities, have a dual role in cancer. On the one hand, ROS can promote protumorigenic signaling, facilitating cancer cell proliferation, survival, and adaptation to hypoxia. On www.annualr..