What Happens When Breast Cancer Spreads to the Brain

Brain metastases from breast cancer are treated as advanced breast cancer—not as a separate “brain cancer”—because the tumors in the brain contain the original cancer cells. The article notes that brain metastases occur in about 15% to 24% of women with metastatic breast cancer, and that figure may rise as survival improves. Often, the spread appears as a recurrence after initial treatment. Goals of care typically focus on symptom relief and quality of life, although “oligometastases” cases—when only a single or few lesions are present—may allow a more potentially curative approach. Symptoms can include headaches and vomiting.