My mum was diagnosed with stage 4 breast cancer 5 years ago. It is quite widely spread within her bones however she has been quite stable for 5 years on letrozole and zometa. She has recently changed to line 2 treatment as uptake in bones which didn't agree with her bloods so quickly changed to line 3. She just had a scan and was told everything is stable but was noted she had inflammation on her lung which they aren't concerned and will check on it in 3 months again at next scan. I am really worried this is the start of it spreading to her lung. Does anyone have any experience with cancer spreading to bones and then lungs and what prognosis is like? She's only 57.