The most common method to detect lung cancer levels is called the TNM System. T (1-4) indicates the size and direct expansion of the primary tumor. N (0-3) indicates how much cancer has spread to lymph nodes (lymph nodes). M (0-1) indicates whether cancer spreads to other parts of the body or not. For example, a small tumor which is not spread in lymph nodes and distant parts can be displayed as T1N0M0.
Depending on the size and structure of the cancer cell through the microscope, pulmonary cancers can be classified mainly into two types - Non-small cell lung cancer (NSCLC) and Small cell lung cancer (SCLC). Non-small cell lung cancer is the cause of 80% of lung cancer, while for the remaining 20%, small cell lung cancer is responsible.
