A better survival outcome is associated with low blood levels of squamous cell carcinoma antigen, or absence of tumor invasion either into the space between the lungs and chest wall or into blood vessels of individuals with a peripheral squamous cell carcinoma, a type of non-small cell lung cancer.<img src="http://feeds.feedburner.com/~r/sciencedaily/~4/RA8Crbtydt0" height="1" width="1"/>
