Until recently I lived back east where I was able to take advantage of the medical library at Harvard for reference use on everything from human gnome studies to stem cell trials and controversies.
I am sorry to say, at least temporarily, we are clear across the country without hard copies. However, I do believe the library is accessible through the internet. Although, I have not as of yet checked to see if you need to be a current student or alumnus in order to take advantage of it's resources via special passwords etc.
I will see what I can do about directing you toward a source of information that may be of more help to you.
Just out of curiousity, what is your doctor's opinion on the subject if you don't mind my asking? Are you in an area where consistent on-going care is available? Have they given you any real information about the scope of his symptoms or what your feasible expectations ought to be? The answers to these questions may also play a large role in your options despite stem cells. Are stem cells even a course of treatment they bring up for discussion? Continue to engage your doctors and practioners. It is important that they understand you expect all your options for your son's optimal health to be an on-going dialogue. Strong advocacy with a healthy dose of informed expectations will always ensure your son's best interests are being met.
Truthfully, I don't know that I would risk the stem cell option on myself given the choice. But then, I am already grown with others who depend on me to make decisions that take their best interests into account as well. Not to mention, that I had the great fortune of being able to take advantage of the top-notch treatment of the time (70's-80's) by people who are now considered leaders in the field of CP care.
There are many dedicated doctors and researchers who are struggling mightily to improve care and maximize potential function for CP patients. Unfortunately, CP is not very "sexy" as causes go and we have no one famous to make it the cause of the day.
I hope that changes in time for your boy...
all the best,