I personally have had Thyroid cancer. It has a cure rate in the high 90% area like testicular cancer. Only radioactive iodine is functional against thyroid cancer, and surgery. One of the reasons they dont say you are truly cured with thyroid cancer is that there is no way to fully remove all thyroid material from the body, the hope is that radioactive iodine, and thyroid hormones keep remaining bad cells at bay for the rest of your life.
Testicular cancer involves removal, radiation and chemotherapy. Cure rate here is just below 95%, and through some research I have found that less than 60% of men return to standard functionality, but nothing shows high level sporting endeavors. I have no problem with that aspect, there does need to be a first for everything, I hope to become elite level again after Thyroid cancer, very few athletes have achieved much after Thyroid let alone other cancers.
On Brain Cancer, cure rate for 5 years is in the mid 30% range, and then drops further beyond 5 years. If thyroid cancer is left untreated, it can manifest into Brain cancer, which is one of my own fears. In LA case, if many recall there were pictures of shaved head, scars, and stitches. A large majority of those just doing basic brain surgery, they have many issues, let alone recovery from that type of surgery. Motor issues, psychological problems, memory loss, and a wide variety of issues, cancer withstanding. Removal of tumors, or legions in regards to brain cancer does affect the brain itself. Like removal of any growth from within the body, its not possible to remove just the growth, surrounding materials are removed as well to some extent. In some cases its a focus as its not known how deep surrounding tissues around a tumor or legion are affected. So add in to this equation, both radiation and chemotherapy. Those are both in normal courses of treatments. Radiation in itself will affect psychological aspects. Chemo in this therapy is known to cause anemia, severe blood issues, white cell depletion, amongst many things. Its not like 1 month post treatment you are back to normal.
Not all chemo and radiation is the same, but there are many aspects that are very similar. My wife went through similar treatments for several carcinomas (not the skin cancer type, but internal tumors). She didnt lose hair like many do. Chemo was the big problem. I dont see how that doesnt mess you up for atleast a year. Think about rehabilitation after a brain injury from a crash. Just trying to contemplate many of these similarities leaves me believing that Brain cancer was more of a scare, testicular cancer happened and was treated successfully. I further put 2 +2 together and in my opinion, which means little, look at how perfect treatment was for LA. Surgery was perfect, chemo and radiation was perfect, 100% cure rate first time around, no side affects, no balance problems, no exercise scares. That for me is hard to believe in my own case, a fairly simple surgery, they closed me up for a week, and then went in 7 days later for further surgery, dissection and removal of further material. While it might be possible to get everything the first time around, few are that lucky. Lastly, brain cancer, with the cure rate below 50% is not something you mess with and try to win 7 Tour's after. You worry constantly whether you are going to relapse.
A few years ago my wife and I debated the possibility of doping after something like this. Your blood scores are so out of tolerance, we were curious if anyone could detect doping, epo or anything after the fact. Now epo can be detected by the molecules that arent natural, but prior it was more ratios and other factors. Heavy chemo messes up the red cell production, bone marrow and other factors. What a perfect excuse to test these drugs, on a cancer patient. The discussion goes much deeper, but that would be pages and pages of text.