1) To your oncologist, this is Tuesday. For you, this is the most important thing in your life.
You can spend WAY more time running things down than any doctor.
2) Medical trials are notoriously bad about being findable.
We have had several articles on HN about this. There are actually businesses that take money to chop through some of the red tape for you.
3) The average reader of HN has a much different skill set than the average doctor.
Certainly, the doctor doesn't have the same ability to crunch through data like programmers do. Nor are they likely as focused.
4) Doctors have a spectrum from excellent to sub par just like all humans.
The treatments are damn near miracles--when they apply. The other problem is that cancer, just like any life form, will mutate over time and generally becomes resistant to the treatment.