I don't know anything about lung cancer but I had breast cancer and my doctor had me take 12 weeks of chemo (1 treatment every 3 weeks) just for precaution measures. If you or your brother are worried about it I would get another opinion. I know that I would.
You can get his test reports and x-rays and have another doctor look at them or have another doctor do the entire checkup over again. I still see my Oncologist every 3 months and a cat-scan and bone density tests every 6 months. It's been almost 2 years that I was diagnosed.
Thanks so much for all the information.
I wish you well my dear, with your journey.
I have read a few of your posts in the past. You are a real inspiration to many.
Good luck with your treatment. You are in my prayers.
Good news. My mom is starting the same treatment next week. Stay healthy, kiddo!