Cancer cells are present in lung secretions but no tumor can be found in the lung. It has not grown through the surface lining of the lung. Another term for this type of lung cancer is carcinoma in situ. The cancer has spread to other parts of the body. Tumor - An abnormal mass of tissue that results from excessive cell division.
Tumors perform no useful body function.
Suggested Reading National Institutes of Health National Cancer Institute Building 31, Room 10A18 Bethesda, MD 20892 Cancer of The Lung . A Guide to Self-Help During Treatment. A Guide to Self-Help During Treatment. What You Need to Know About Lung Cancer. A Program on Rehabilitation by a Lung Cancer Patient.