The stages of lung cancer are described in a variety of ways. Doctors utilise stages to determine where the cancer is at any one moment and how it will react to various therapies. The following is a simple method to explain how cancer develops: Localized cancer means it hasn't spread beyond its initial location. Cancer has spread to adjacent tissues on a regional level. Distant: The cancer has progressed to other areas of the body, including the bones, liver, and brain. At stage 3 lung cancer treatment in Delhi the progression is from a localised to a distant stage. More information about metastatic lung cancer may be found here. Stages are assigned a number. NSCLC may be described by a doctor using numbered phases. The phases are numbered from 0 to 4, with 0 being the earliest and 4 being the most advanced or distant. At this stage, cancer has begun to expand beyond the lung where it began, but it has not yet gone throughout the body. Stage 3 is divided into three categories: 3