[Treatment of breast cancer based on its specific biological behavior]

Breast cancer is one of the types of malignant tumor which have hormonal dependency and anti-tumor treatments utilizing this characteristic are widely performed. ER-positive breast cancer responds well to ablative surgery or administration of anti-estrogenic compounds. In contrast, high-dose administration of estrogen is also effective in postmenopausal patients. Inflammatory breast cancer is a rapidly growing and spreading type of tumor and for these types of cancers preoperative chemo-endocrine therapy is effective. However, the prognosis of cases with liver metastases is not good and therapeutic methods for such patients should be investigated.