How to know if lung cancer therapy is working?

Question

Hello doctor,

My father is 55 years old and has stage 4 lung cancer. He is currently on targeted therapy and spends most of his time in bed. We are wondering if this treatment could realistically help him regain some mobility or improve his current level of disability, or if that is unlikely.

How long does it usually take to see improvement with targeted therapy?
When should we start to worry that the treatment might not be working?
Can you tell us what signs we should look for to know if the therapy is working?
When would it be time to think about changing the treatment plan?

Kindly help.

Thank you very much for your guidance and support.

Answer 1

Hello,

Welcome to icliniq.com.

I have carefully reviewed your query and understand your concerns.

I am truly sorry that your father and your family are going through such a challenging time.

For stage 4 lung cancer, targeted therapy begins when doctors find a genetic mutation that lets the medicine work directly on the tumor cells. This treatment can help control the cancer for some time, and symptoms may get better if the tumor responds.

Your father’s mobility could improve, but it depends on what is causing his weakness. If his movement problems are mostly from cancer, tiredness, or trouble breathing, targeted therapy might help if it controls the disease. Some people regain strength and become more active as treatment works, but recovery is different for everyone, especially in advanced cancer.

Targeted therapy takes time to show results. Doctors usually check progress after six to eight weeks, often with a computed tomography (CT) scan. Some people notice early changes in breathing, appetite, or energy, while others improve more slowly. If there is no quick improvement, it does not mean the treatment is not working.

Signs that the therapy is working can include easier breathing, less coughing or chest discomfort, better appetite, more energy, and being able to sit, stand, or move more easily. Still, the most reliable way to know if treatment is helping is through follow-up scans and check-ups with the oncologist.

If weakness, breathlessness, pain, or your father’s overall condition gets worse even with treatment, the oncology team will review his situation and may look at other options.

I hope this helps address your concerns.

Please feel free to reach out for any further clarification.

Wishing your father and your family strength and the very best.