What is meant by 1st line 2nd line or 3rd line lung cancer therapy?

This video is intended for non-US residents.

1st line therapy is the initial treatment you will receive for your lung cancer. 2nd line therapy is given if the cancer progresses after the first treatment. 3rd line therapy is given when the cancer progresses after the second treatment.

For more information on lung cancer and lung cancer treatments, visit:
http://www.lifewithlungcancer.info