insufficient her2 testing--not enough patients given possibility of benefiting from

One of the findings I found most amazing in this study was that 20% of people on herceptin had never been tested for HER2. How can that be? It is so expensive, and such a time consuming treatment, how can it be approved for people who have not been tested? If that is true, no wonder medical costs in this country are through the roof. Who is minding the store?