- Lung Cancer Basics
PDT is a procedure in which a special chemical is injected into the blood stream. The chemical is absorbed by all the cells but does not stay in normal cells long. It remains in cancer cells quite awhile and a laser aimed at the cancer activates the chemical to kill the cancer cells. At this time, PDT is approved for relief of symptoms (such as breathing problems or bleeding) in non-small cell lung cancer and can also treat small tumors.