Desmoglein-3 and Napsin A double stain, a useful immunohistochemical marker for differentiation of lung squamous cell carcinoma and adenocarcinoma from other subtypes.

The treatment strategy of differentiating lung carcinomas into small-cell lung carcinoma and non–small-cell lung carcinoma has been satisfactory until recently. The introduction of novel cytotoxic agents that affect a patient’s response to therapy has made further differentiation important. Non–smal