No. Of the women diagnosed with breast cancer, 80% have no signs of metastases, meaning that no cancer has spread beyond the breast and nearby lymph nodes. Furthermore, 80% of these women live at least 5 years, most live longer than 5 years, and many live much longer. Even women with signs of cancer metastases can live a long time.
Furthermore, promising breakthroughs in treatment of breast cancer are becoming available all the time.