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How long will I survive with stage 4 lung cancer?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hello doctor,

I have lung cancer, stage 4. They will do a brain MRI for the next few days. The oncology doctor said the situation is too bad and the life expectancy is three months now. He said three days ago. But they also said the life surveillance is six months or nearly one year old. Why are they speaking like this? I do not understand.

Also, I believe that in the brain there are no aggressive cancers because of my knowledge and previous brain MRI reports. My question is whether the brain MRI result is not too bad, and the patient can still speak, eat, and walk. Is the three-month life survey still true?

Oncology cut the chemotherapy nearly nine months ago, and they said they will not continue or restart the chemotherapy. They said we changed the chemotherapy with four different techniques, and also they said we also gave immunotherapy, but it did not work. Do you recommend chemo again?

Kindly suggest.

Hello,

Welcome to icliniq.com.

I understand your concern.

The survival rate in stage 4 lung cancer estimates shift as the disease progresses. It depends on which organs are involved, the tumor's molecular profile, the histological type, and the patient's general condition, all of which change over time, and the estimate reflects where things stand right now.

It is not that the earlier estimate was wrong; it is that the disease itself has evolved. If the brain MRI (magnetic resonance imaging) comes back without aggressive involvement and the patient is still walking, eating, and talking independently, that functional status does factor meaningfully into the overall picture, and it's worth having that specific conversation with the oncologist once the results are in hand.

Regarding your question on the chemotherapy, after four regimens and immunotherapy with no response, restarting IV chemo is a hard case to make.

But before closing that door entirely, it is worth asking whether the molecular profile has been fully evaluated for EGFR (epidermal growth factor receptor), ALK (anaplastic lymphoma kinase), ROS1 (c-ros oncogene 1 (or ROS proto-oncogene 1), KRAS G12C (Kirsten Rat sarcoma viral oncogene homolog (Glycine-to-Cysteine substitution at codon 12), or other targetable mutations.

Some stage 4 lung cancers respond to oral targeted therapy even after multiple rounds of chemotherapy fail, and that is a very different conversation than cycling back through more IV (intravenous) chemotherapy. If that workup has not been done recently, requesting it through the oncologist at a cancer center would be a reasonable next step.

I hope this helps you.

For more queries, feel free to reach out to me anytime.

Thank you.

Medically reviewed byiCliniq medical review team

Published At May 17, 2026
Reviewed AtMay 17, 2026

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