I just want to say I am so sorry you have the beast! Cancer!
I really think if they only found cancer in your lungs, no where else that you ought to get a second opinion. You can have another pathologist , at another facility do another pathology report. Mistakes happen. No one is perfect. As Connie said, cancer in different areas , different types of cancer respond to different treatment. You want to be comfortable that the diagnosis is absolutely correct as possible.
Sincerely, Donna G