The role of positron computed tomography (PET/CT) in lung cancer staging.

Lung cancer is the leading cause of cancer-related mortalities with the rate of incidence reaching about 1.5 million cases per year worldwide. Approximately 350 people die each day from lung cancer in USA-nearly 2.5 times more than the number of people who die from colorectal cancer (CRC), which is the second leading cause of cancer death overall. In 2023, an estimated 238,340 people (117,550 men and 120,790 women) will be diagnosed with lung cancer, and 127,070 people will die from the disease. Although approximately 80% of lung cancers are caused by cigarette smoking, the toll among people who have never smoked is substantial, ranking among the top 10 causes of cancer death when categorized separately. Lung cancer encompasses a variety of biologically distinct tumours. The two primary types of lung cancer are non-small cell lung cancer (NSCLC), which accounts for 81% of cases, and small cell lung cancer (SCLC), which accounts for 14% of cases. NSCLC is further categorized as adenocarcinoma, which is slightly more common in women, followed by squamous cell carcinoma and large cell carcinoma.