Wherever the idea of your attitude affecting your cancer survival chances originally comes from, after decades of research it has become clear that with an extremely high certainty, your attitude has no effect on your chances of surviving cancer. Your immune system does not magically become better or worse at fighting cancer if you are or are not positive and happy. Still, this myth is going strong, as it appeals to our culture of self-empowerment and agency and is spread by many well-meaning people.
