I say most of the studies are biased because while they may list individual examples or studies they never actually address the basic question originally posed at the beginning of the article: for instance, in one of the alternative treatment side articles they had one example of an individual being cured of cancer after switching to a vegan diet and removing highly processed sugars from his system. They gave several cases in which other people were cured alternatively, without any citations, then went on demonizing modern medical cancer treatment as being ineffective and only practiced due to the money making aspect of its use. They didn't go into any real detail on the alternative treatments nor did they post any information about Chemotherapy aside from the original article claiming 2% chemo success rate.
On the other hand I read an article which was seeking to counter these claims and in fact went into a lot of the factors you mentioned, such as type of cancer, health of the person being treated and the resulting treatment based on the above as well as cost. Throughout the article they likewise demonized alternative treatment proponents at nut jobs and crank cases and never actually gave any statistics as to the argument it was originally set out to trounce, which was the claim that chemotherapy is effective 2% of the time. They described the development and medical breakthroughs which chemo therapy treatment but never actually addressed the statistic value of chemo therapy succes. There were estimates and percentages of the cancer types found and the frequency off cancer among age groups, but no actual success rates.
Ideally what I would one is a flat, graph or list of success rates for the different types of cancer and treatments practiced for those cancers. I would hope to see as much information as possible; cancer type, location, treatment used, treated patients orgnanizec by age group with general health, attitude and time treated.
I believe this list work be very extensive and long but it's still what I think I need to figure out the truth.