Why do people assume that a possible cure is being hidden, when you would never know about this possible cure if tey hadn't publicized it? With all the competition for new cancer treatments, and the unlikelihood that any breakthrough will truly eliminate all cancers, it is highly unlikely the companies would fail to pursue a promising treatment.
Because, by publishing this, hope continues to bring in funding dollars to the various projects around the US.
Because they don't understand the whole picture. For every government/ngo grant-driven research program there are ten biotech startups working on novel approaches and funded with venture capital, debt, and the proceeds of public stock offerings. When one of these small enterprises passes an FDA hurdle in clinical trials, their stock shoots up. If they ever produce, it will stay up and go higher. No one ever got wealthy by spending money, even on research. Big pharma got big by selling product, not by spending cash on dead-end R&D.