Stress is inevitable. Chronic stress can increase our risk for heart disease and may also help cancer spread. How this works has remained a mystery. They discovered that stress causes certain white blood cells called neutrophils to form sticky web-like structures that make body tissues more susceptible to metastasis. The finding could point to new treatment strategies that stop cancer's spread. The team arrived at their discovery by mimicking chronic stress in mice with cancer. They first removed tumors that had been growing in mice's breasts and spreading cancer cells to their lungs. Next, they exposed the mice to stress....