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The article discusses changes to the American Society of Clinical Oncology (ASCO) clinical practice guideline which covers the use of chemotherapy, biologic therapy, and molecular markers for stage IV non-small-cell lung cancer (NSCLC) in the U.S. It notes that the changes follow several regulatory actions regarding new agents approved by the U.S. Food and Drug Administration (FDA). It mentions that the FDA and the Canadian Agency for Drugs and Technologies in Health have restricted the use of gefitinib in the released guideline.