How is immunotherapy used to fight cancer? If you take the brakes off the immune system, you can unleash an attack on cancer cells. That's the theory behind PD-1/PD-L1, a vitally important immunotherapy discovery illustrated in this video. | Dana-Farber Cancer Institute

Immunotherapy is transforming the way breast cancer is treated by harnessing the body’s own immune system to fight cancer cells. Advanced drugs like Trastuzumab, Pertuzumab, Trastuzumab Deruxtecan, and T-DM1 target the HER2 receptor, while Pembrolizumab and Atezolizumab are used in triple-negative breast cancers to enhance treatment response. These targeted procedures help control disease progression and improve patient outcomes. Testing for HER2 and PD-L1 receptors plays a key role in determini