Should Pleural Fluid Cytology Be Incorporated in the TNM Staging System for Operable Nonsmall Cell Lung Cancer?

^aDepartment of Thoracic Oncology, National Cancer Center Hospital East

^bDepartment of Pathology, National Cancer Center Research Institute East, 6-5-1, Kashiwanoha Kashiwa, Chiba, 277-85775 Japan

^cSecond Department of Surgery, Fukuoka University School of Medicine, 7-45-1, Nanakuma, Jonan-ku, Fukuoka City, Fukuoka, 814-0180 Japan

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