 Breast cancer is the most frequent cancer among women, causing over 500,000 deaths every year. Early diagnosis is key to effective treatment and can save lives. This week, experts from around the world are at the agencies headquarters in Vienna to discuss new ways to detect and evaluate breast cancer. Modern clinical cancer treatments require precise imaging information, which has an impact on the outcome of patients with breast cancer. The IAEA is starting a new project focused on the evaluation of chemotherapy response of breast cancer patients with a brand new and more accurate molecular imaging technique that can detect tumors as small as 1.5 millimeters.