(KPLR) - Did you know October is National Breast Cancer Awareness Month? According to the World Health Organization, breast cancer is the most common cancer of women around the globe. The disease claims hundreds of thousands of lives each year. Researchers at Siteman Cancer Center are putting forth a valiant effort to help combat the disease. Tonight on The Pulse of St. Louis, learn more about a vaccine developed by doctors at Washington University School of Medicine that is showing great promise in patients with metastatic breast cancer.