Although the outlook of people with breast cancer has improved dramatically in recent years, predicting and preventing the spread of cancer to other parts of the body (metastasis) continues to be a major challenge in the medical community.
Recent estimates place the number of women living with metastatic breast cancer in the United States at 154,794.
Around 5–9% of new breast cancer cases are already in metastasis at the time of diagnosis, according to some estimates.
