Carcinoembryonic antigen is elevated in most small cell lung cancers, but there are some that do not show abnormalities.
Carcinoembryonic antigen is a kind of tumor marker for small cell lung cancer, but it is not a specific indicator, it can only be said that most of the patients in middle and late stages will have elevated indicators, but some of them will not have abnormalities, it can be used as an auxiliary diagnosis and a basis for testing, but it cannot be used as the final basis for diagnosing small cell lung cancer.
For patients with small cell lung cancer, it is still necessary to complete lung CT, MRI and pathological tissue biopsy in time in order to diagnose small cell lung cancer more accurately and take targeted treatment in time.