1. Squamous cell carcinoma (also known as squamous cell carcinoma): In the most common types of lung cancer, accounting for approximately 50%, mostly in patients aged over 50 years old, male-dominated. Most of the bronchial origin in the larger, often central lung cancer. Although squamous differentiation vary, but in general the growth pace of development has been slow, with longer course of radiotherapy and chemotherapy more sensitive. The first lymph node metastasis, hematogenous metastasis of late.
          2. Undifferentiated carcinoma: the incidence of squamous cell carcinoma second, more common in males, age of onset less. General bronchial origin in the larger, ranking central lung cancer. In accordance with the organization oat cell morphology can be divided into cells, small round cells and the cells of several types, of which the most common oat cell. Undifferentiated carcinoma of high grade, fast-growing, but earlier appeared lymphatic and hematogenous metastasis of radiation and chemotherapy more sensitive, in the worst prognosis of lung cancer.

          3. Adenocarcinoma: Origin of the bronchial epithelium, the largest minority origin of bronchial mucous glands. The incidence of squamous cell carcinoma than low and undifferentiated carcinoma. The age of onset smaller female relative seen. Most cancer originated in smaller bronchial for peripheral lung cancer. Early generally not obvious symptoms, often in the chest x-examination was found, showed round or oval lumps, but sometimes slower growth generally occurs early hematogenous metastasis, lymph node metastasis occurred later.

          4. Pulmonary alveolar cell carcinoma: Origin of the bronchial epithelium, also known as bronchioloalveolar cell carcinoma or adenocarcinoma of the bronchioles. Sites around the lung field. In all types of lung cancer, the incidence of the lowest seen more women. General higher degree of differentiation, slower growth, along Bronchioloalveolar carcinoma, the alveolar wall and alveolar growth, without infringing alveolar interval. Blood and lymphatic metastasis occurred late, but can be disseminated to other transbronchial lung or pleural violations. In alveolar cell carcinoma of the diffuse and nodular type of two categories, the former can be more than a single nodule or nodules; The latter form of pneumonia similar. The nodular lesions of the limitations of surgical resection good effect