In February my mum was diagnosed with stage 3B non-small cell lung cancer. She's undergone chemo and radiation and now recently started immunotherapy. Her recent scan showed that the tumor shrunk by half despite it still being too early to do a scan (she needed it for immunotherapy) and the doctor said it's excellent news.

Mum is doing really well as is back to her old self. I was feeling positive but feel really depressed. I'm scared that the treatment won't work or if it does that the cancer will come back. Dr main oncologist said that they're aiming to cure mum and do everything in order to increase her five year survival rate (hopefully she'll live way longer than five years).

The doctors all think that my mum looks really good for her age and is in good condition despite having some comorbidities.

I've been reading a lot on the internet and some articles say that stage 3B lung cancer can't be cured and some say it can. Other articles say the 5 year survival rates aren't good, others say that they're improving and not to focus on statistics. I'm also worried that the immunotherapy won't keep the cancer away for good and that it will come back even if it's successful. Some articles say that immunotherapy is being seen as a potential cure, others say that cancer comes back after immunotherapy even if not as soon. 

I want my mum to live so bad. We joke that she'll live to 102. I really want her to as long as she's in a good state (she's 71). She's so vigorous and strong. She's so positive about beating cancer. I don't want to tell her my fears and lower her spirits. She doesn't read up anything on the internet and tells me to avoid it. 

I can't lose my mum, she has so much life in her.