What is the chance of survival in stage 4 lung cancer?

Hi,

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When the patient has been diagnosed to have stage 4 lung cancer, the survival depends on lots of factors. They are co-morbidities such as diabetes and hypertension, performance status whether he is able to walk around and do his activities or he is confined to bed, the extent of metastasis detected on other scans such as ultrasound abdomen and bone scan. In general, it is about 30 percent survival at the end of 2 years but maybe even more than 50 percent if the above factors are positive. The cure is not possible, but his symptoms can be reduced with chemotherapy after the biopsy report comes. If the biopsy comes as adenocarcinoma and EGFR (epidermal growth factor receptor) mutation is positive, he may be able to avoid chemotherapy and use only a tablet, which will reduce the side effects associated with chemotherapy.

Thank you.