Preface for special issue “Advances in treatment and care in metastatic breast cancer”

More than 70% of patients with operable breast cancer who received the modern standard of care can be cured. On the other hand, patients with metastatic breast cancer (MBC) are still incurable and have poor prognosis with approximately 3 years of median survival time. However, the prognosis of MBC is gradually improving in step with advances in life science and technology and changes in the social environment.