Another area of major change is in the area of targeted treatments for breast cancer. Her2+ breast cancers account for 1 in 5 breast cancers diagnosed in the United States. 20 years ago it was considered one of the bad cancers to get. But in 1998, a targeted medication called Herceptin became available and over the past 20 years has revolutionized the treatment of Her2+ cancers. With the advent of Herceptin, and now additional Her2 targeted drugs, Her2+ breast cancers are now very curable and treatable. A recent study showed that the use of Herceptin with chemotherapy for early stage Her2+ breast cancer has a 98% disease free survival at 3 years.
Source : https://www.idahopress.com/community/health/advances-in-breast-cancer-a-look-back-over-the-past/article_e18831c2-8227-53e1-bf28-39dee2e4affa.html