Seminars in Diagnostic Pathology
Volume 23, Issue 1 , Pages 15-19, February 2006

The role of immunohistochemistry in distinguishing squamous cell carcinoma from mesothelioma and adenocarcinoma in pleural effusion

  • Qing Li, MD, PhD

      Affiliations

    • Department of Pathology, The University of Michigan Hospitals, Ann Arbor, Michigan
    • ,
  • Neil Bavikatty, MD

      Affiliations

    • Department of Pathology, Munson Medical Center, Traver City, Michigan.
    • ,
  • Claire W. Michael, MD

      Affiliations

    • Department of Pathology, The University of Michigan Hospitals, Ann Arbor, Michigan
    • Corresponding Author InformationAddress reprint requests and correspondence: Claire W. Michael, MD, Department of Pathology, 2G322, University of Michigan Hospitals, 1500 East Medical Center Drive, Ann Arbor, MI 48109.

Background

Distinguishing metastatic squamous cell carcinoma (SCC) from malignant mesothelioma (MM) and adenocarcinoma (ADC) in pleural effusions may be particularly challenging by routine cytologic stains. We explored the utility of using a panel of six antibodies to differentiate SCC from MM and ADC.

Design

33 cases of pleural cytologic preparations retrieved from our archives consisted of 9 cases of SCC, 12 cases of epithelial MM, and 12 cases of adenocarcinoma of lung. Cell blocks were prepared by the thrombin clot technique followed by formalin-fixation and paraffin-embedding. Tissue sections of 4 μm were stained with hematoxylin and eosin and the immunoperoxidase method visualized by the biotin-streptavidin-peroxidase system. The antibodies used were cytokeratins (CAM 5.2, K903, and CK 5/6), cell membrane glycoproteins (CEA and Ber-EP4), and calretinin. In all cases, the reactivity pattern was graded on a sliding scale from 0 to 4+ according to the percentage of reactive cells.

Results

SCC was positive for K903 (100%), CK 5/6 (89%), CAM 5.2 (78%), and CEA (22%), and negative for Ber-EP4 (100%) and calretinin (100%). MM was positive for calretinin (100%), CAM 5.2 (100%), K903 (92%), CK 5/6 (92%), and negative for CEA (100%) and Ber-EP4 (100%). ADC was positive for CAM 5.2 (100%), CEA (83%), and Ber-EP4 (83%), and negative for calretinin (100%), K903 (92%) and CK 5/6 (92%).

Conclusions

Our studies confirm the role of the above panel of antibodies in distinguishing among these malignancies. Positive staining for K903, CK 5/6, and CAM 5.2 separated SCC and MM from ADC. Positive staining for calretinin separated MM from SCC and ADC. Positive staining for glycoproteins and predominantly negative staining for CK 5/6, K903 and calretinin separated ADC from SCC and MM.

Keywords:  Immunocytochemistry , Pleural effusions , Malignant mesothelioma , Squamous cell carcinoma , Adenocarcinoma

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PII: S0740-2570(06)00090-6

doi:10.1053/j.semdp.2006.06.007

Seminars in Diagnostic Pathology
Volume 23, Issue 1 , Pages 15-19, February 2006

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