We were able to provide an answer to frequently asked question (FAQ) on “Lung Cancer Definition” in our last article. You can read that here – 6 Facts On The Best known Treatment For Lung Cancer - http://socialspy.ng/2016/04/13/6-facts-on-the-best-known-treatment-for-lung-cancer/

Fast forward to now, we will be taking into consideration stages of cancer and emphasis on “stage iv cancer”
Please note that the stages of cancer helps us to determine where the cancer is located within the body and it’s spread thus far. Most importantly to know whether it has affected other parts of the body.

Series of test is often carried out by the Doctor in charge to determine the stage at which the cancer is.
Below are the different stages of cancer.

Stage 0: “in situ” We describe this stage as being in a Tabula Raza state. That is, the cancer is on a clean state, still located at the place where it originated from. The cancer is still small and contained in her circle.

Stage 1: This stage shows that the cancer has not fully grown or spread into nearby tissues within the body. At this is stage, there is a spread into lymph nodes close to the tumour

Stage 2 & 3: This stage shows that the previously small cancer tumors gave grown and spread into nearby tissues within her territory. Usually spread to lymph nodes but not fully to other parts of the body

Stage 4: “Stage iv cancer” – This stage shows that the cancer has spread from it’s Tabula Raza state or “in situ” state into other body organs within the body. This “stage iv cancer is also known as secondary/advanced/metastatic stage. We can call a cancer “stage iv cancer” until there is a spread into distant part of the body.

You are still very vague about stage 4 cancer, despite your caption saying all you need to know.