The pathologic diagnosis of lung cancer historically has relied primarily on morphologic features of tumors in histologic sections.\r\nWith the emergence of new targeted therapies, the pathologist is called upon increasingly to provide not only accurate typing of\r\nlung cancers, but also to provide prognostic and predictive information, based on a growing number of ancillary tests, that may\r\nhave significant impact on patient management. This review provides an overview of ancillary tests currently used in the pathologic\r\ndiagnosis of lung cancer, with a focus on immunohistochemistry and molecular diagnostics.
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