How has breast cancer treatment improved over time?

Many ways: In many ways it has improved. First of all withearlier detection there is less need of less aggressive excisions and chemo and radiotherapy. Have many advances in chemotherapy, for example it is a lot more targeted to specific receptors on the cancer.

Yes, remarkable: Progress is achieved in recent years , but still long way to reach the goal the cure , due to awareness , early diagnosis , improved diagnostic tools , ( better mammography , MRI , etc ) , improved knowledge in biology of tumor , genetics , availability and advances in chemotherapy and more and financial contribution for research by people like you.