Is biomarker testing needed before lung cancer treatment?

Question

Hello doctor,

I am a 46-year-old male and was recently diagnosed with lung cancer. My oncologist has advised something called biomarker testing before starting treatment, and I am feeling quite confused about it.

I do not fully understand what this test actually checks for or why it is so important in deciding the right treatment. I have never heard about genetic or molecular tests related to cancer before, so this is all very new and a bit overwhelming for me and my family. Please tell me:

Could you please explain what biomarker testing means in lung cancer?
Does it help doctors choose targeted therapy or immunotherapy based on the results?

Also, how long does it usually take to get the results, and how soon can treatment be started after that?

Please help.

Thank you in advance.

Answer 1

Hello,

Welcome to icliniq.com.

I read your query and understand your concern.

First of all, I want to acknowledge how overwhelming a recent diagnosis of lung cancer can feel. It is completely natural to feel anxious and confused at this stage. Please know that many types of lung cancer today are treatable, and outcomes have significantly improved with newer therapies.

One very important step before starting treatment is biomarker testing (also called genetic or molecular testing).

Biomarkers are specific changes inside the cancer cells (like gene mutations or proteins). These tests analyze a small sample of your tumor to identify these changes. Think of it as decoding the tumor to understand its behavior.

Different lung cancers behave differently. Based on these results, doctors can choose the most effective treatment for you.

It helps identify whether your cancer may respond better to:

Targeted therapy (medicines that specifically attack the cancer’s genetic mutation, like a precision missile instead of general treatment).
Immunotherapy (treatment that helps your own immune system recognize and fight cancer cells).

Earlier, treatment mainly relied on chemotherapy (broad cancer-killing drugs). Now, in many patients:

Chemotherapy may not be needed at all, or may be used along with other treatments.
Some patients do very well for years with targeted therapy or immunotherapy.
Quality of life and disease control can be significantly better with personalized treatment.

Doing this testing helps your oncologist:

Choose the most effective and least toxic treatment.
Avoid treatments that may not work for your specific cancer type.
Build a personalized treatment plan for better long-term control.

I strongly encourage you to proceed with genomic (biomarker) testing, as it plays a very important role in modern lung cancer treatment and can make a significant difference in outcomes.

I hope this helps.

Kindly revert so I can assist you further.

Thank you.