Lung cancer ranks first in developing countries in terms of incidence and death rate, and with the gradual promotion of low-measurement ct screening, the incidence of lung cancer has a tendency to gradually increase. Lung cancer related tumor markers are roughly the following 1. neuron-specific sialylase nse Mostly seen in small cell lung cancer 2. proGrp gastrin precursor Still small cell lung cancer 3. cyfra21-1 Non-small cell lung cancer 4. squamous epithelial carcinoma related antigen scc Mainly seen in squamous carcinoma Is there any significance to distinguish small cell lung cancer from non-small cell lung cancer? The answer is because the progression of lung cancer and treatment options are different between the two pathological types, with small cell lung cancer being relatively more malignant but sensitive to radiotherapy.