Overview of lung cancer

Lung cancer occurs in the bronchial mucosal epithelium and is also called bronchial lung cancer. Lung cancer generally refers to cancer in the lung parenchyma, and usually does not include other mesodermal tumors originating from the pleura, or other malignant tumors such as carcinoid, malignant lymphoma, or tumors metastasized from other sources. Therefore, the lung cancer we refer to below refers to malignant tumors originating from the bronchial or bronchiolar epithelial cells, which account for 90-95% of malignant tumors of the lung parenchyma.

Lung cancer is currently the leading cause of cancer death in the world. In 1995, 600,000 people died of lung cancer worldwide, and the number is rising every year. In 2003, the World Health Organization (WHO) announced that the mortality rate was 1.1 million/year and the incidence rate was 1.2 million/year. The incidence of lung cancer in women is particularly on the rise. The disease often occurs in people over 40 years old, with the peak age of onset being between 60 and 79 years old. The male-female prevalence rate is 2.3:1. In addition, race, family history and smoking all have an impact on the incidence of lung cancer.

Lung cancer originates from the bronchial mucosal epithelium. Tumors confined to the basement membrane are called carcinoma in situ. They can grow into the bronchial cavity and/or adjacent lung tissues, and can spread through lymphatic blood or bronchial metastasis. The growth rate and metastasis of the tumor are related to its biological characteristics such as histological type and degree of differentiation.

The distribution of lung cancer is more common in the right lung than in the left lung, and more common in the upper lobe than in the lower lobe. Cancer can occur from the main bronchi to the bronchioles. Lung cancer originating from the main bronchi and lobar bronchi, located near the hilum of the lung, is called central lung cancer; lung cancer originating below the segmental bronchi, located in the peripheral part of the lung, is called peripheral lung cancer.

The above is the expert's introduction to lung cancer. I hope it can be helpful to everyone. The above content is for reference only and cannot be used as a basis for diagnosis and treatment. Specific treatment should be made according to the actual situation. It is recommended that all diagnosis and treatment should follow the guidance of the doctor. If you have other questions, please consult our experts online or call for consultation.

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