If you haven't, ask your doctors where it might to spread to, and carefully monitor changes in those areas.

I have experienced three cases in my close relationships where spreading was not picked up for a long time due to being in different body parts.

In one of the cases asthma medication and physiotherapy was prescribed for a year before an unrelated shoulder x-ray caught the attention of the radiologist, and further images showed the cancer had spread to lungs and spine...