NCIt definition : A non-small cell lung carcinoma detectable by sputum cytology only. The primary tumor
is undetectable radiographically or during bronchoscopy; therefore, it can not be
assessed.;
Alternative definition : NCI-GLOSS: Cancer cells are found in sputum (mucus coughed up from the lungs), but
no tumor can be found in the lung by imaging tests or bronchoscopy, or the tumor is
too small to be checked.;