... for details of primary sites and cancer types. Table 3. Primary organs and their tumor types metastasizing to the pleural fluid in 474 cases IHC was performed in 235 (49%) cases. The most common primary site diagnosed on IHC was the lung (43%), followed by the breast (17%). The most common...

...Lian Liu; Cynthia Cohen; Momin T. Siddiqui Objective: Thyroid transcription factor 1 (TTF-1)/napsin A double staining is useful for the identification of primary lung adenocarcinoma. We examined its performance in pleural fluid. Study Design: Thirty-eight pleural-fluid specimens with lung...