FDA has approved new labeling for Iressa that states the medicine should be used only in cancer patients who have already taken the medicine and whose doctor believes it is helping them. New patients should not be given Iressa because in a large study Iressa did not make people live longer. There are other medicines for non-small cell lung cancer (NSCLC) that have shown an ability to make people live longer.
http://www.fda.gov/cder/drug/infopage/gefitinib/default.htm