Lung Adenocarcinoma

Lung adenocarcinoma is the most common subtype of non-small cell lung cancer (NSCLC), representing approximately 40% of all lung cancer cases in the United States. It typically originates in the peripheral regions of the lungs and the bronchial lining, with tumor cells exhibiting glandular, mucinous, or solid histological patterns. Although strongly associated with a history of smoking, it is more frequently diagnosed in women and younger individuals compared to other lung cancer types. Common symptoms include fatigue, persistent cough, shortness of breath, chest or upper back pain, and hemoptysis. Staging is critical for determining treatment strategies, as management varies significantly based on disease extent. Despite declining incidence and mortality rates, lung adenocarcinoma remains the leading cause of cancer-related deaths in the U.S., underscoring its clinical significance and ongoing public health impact.