Monitoring Breast Cancer Immunotherapy Treatment With Advanced Positron Emission Tomography Magnetic Resonance Imaging (PET/MRI)

Triple negative breast cancer patients that are planning to undergo immunotherapy and consent to this study will have 3 imaging visits. Imaging visit 1 will take place before the patients start immunotherapy. Imaging Visit 2 will take place after the patient completes the 1st cycle of immunotherapy and before they start their 2nd cycle. Imaging Visit 3 will take place when the patient completes the 2nd cycle of immunotherapy and before they start the 4th cycle.