well maybe there isn't possibility to find individual cancer cell, but from what I heard FDG-PET scanning is really accurate http://en.wikipedia.org/wiki/Positron_e ... y#Oncology
It's good but unfortunately you still have to play the odds with chemo and overdo it a good bit, just make sure you hit the cancer cells that the PET missed.
I'm currently getting an extra four months (2 treatments/mo) of chemo even though it's probably been all gone since treatment #1-4.
The inability to scan for a single cell is one of the big issues in the field. Get that and cure rates will go way up, since the cancer drugs / radiation treatment have the side effect of occasionally causing other cancers...
Editorial:
Also, stop smoking... by law, by culture, by personal decisions, by deus ex machina, whatever, and the entire cancer landscape gets less ugly. Lung cancer is one of the toughest/deadliest in every aspect except prevention.