I am sorry to hear about your son, but to ask anyone what is the best treatment for your son is an impossible question to answer.
If an alternative cancer treatment worked for one person, that does not mean it will work for your son. Most alternative cancer treatments are about 25% effective. That is not the best rate on which to bet your life. Testimonials cannot help you find the best treatment; they don't even tell you the success rate.
There is most likely an alternative cancer treatment that will work for your son, but finding it can consume a lot of time. Consider going to a biofeedback practitioner with a collection of alternative cancer treatments and see what your son's body tells you about the effectiveness of those treatments. Then you will have input based on your son's body.
To save yourself the time and expense of collecting alternative cancer treatments, you can order a collection of twelve samples: