Cancer is typed and treated by its origin, regardless of where it travels to. Western medicine’s ‘standard of care’ (SOC) is determined by that origin. In my case, primary breast cancer metastasized to bones, lungs, liver, lymph and eventually brain. My treatment plan reflected that and differed from someone whose cancer had begun in their lungs and traveled. So, one’s lung cancer brain metastases will be treated differently than another’s breast cancer brain metastases. That being said, there are some principles that apply in any case.