Why do I need a lung cancer tumor marker test?You may need a lung cancer tumor marker test if you have been diagnosed with a type of lung cancer called non-small cell lung cancer. This type of cancer is more likely to have a genetic mutation that will respond to targeted therapy.Targeted therapy is often more effective and causes fewer side effects than chemotherapy or radiation. But it's important to know which mutation you have. Targeted therapy medicines that are effective in someone with one type of mutation, might not work or may be dangerous to someone with a different mutation or no mutation.
