I don't have time to look up any decent sources right now, and it's very possible that there are far more studies that disagree with this, but I'm sure there ha

I don't have time to look up any decent sources right now, and it's very possible that there are far more studies that disagree with this, but I'm sure there has been at least some research showing that placebos can affect more than just the most obvious things that the mind controls, e.g. pain. Obviously any placebo relies on tricking the mind, but the mind can have a subconscious effect on how your body does anything, including fighting cancer.