Obama will cease to be president in a year. With a high degree of probability, we can say that the victory over cancer will occur under some other US president. This is the first.
Second, medicine has been fighting cancer for a long time and has already achieved some success. Early diagnosis, chemotherapy, transplants, and high-quality surgeons often help solve the problem. Another thing is that all this is expensive. If money and brains are invested in the program to fight cancer, and the next president does not close the shop, then humanity will make significant progress in the fight against cancer. True, it is not a fact that a complete victory over him is generally possible.
And to the words of Obama, I would, in any case, treat him as populism. After all, making big statements is his job.
If a lot of money is spent on solving a problem, so that a large number of minds can work on it, the likelihood of a solution increases.
And what kind of plans are these? I am not quite aware of what Mr. Obama said about this. If by "victory over cancer" is meant the ability to completely cure any cancer, then the answer will be negative. This is impossible, despite the significant progress in the treatment of many types of oncological diseases (not only cancer) it will not be possible to make it completely curable (more precisely a group of diseases) in the near future. In the treatment of some types of cancer (for example, pancreatic cancer) the results are still very poor.