title: Value of E-cadherin and N-cadherin immunostaining in the diagnosis of mesothelioma.
abstract: Distinguishing between epithelioid mesothelioma and pulmonary adenocarcinoma involving the pleura can be difficult on routine histological preparations. This differential diagnosis can be greatly facilitated by using immunohistochemical markers. E-cadherin and N-cadherin are among the newly described markers that have been proposed as potentially useful in the diagnosis of mesothelioma. E-cadherin and N-cadherin are members of the cadherin family of calcium-dependent cell adhesion molecules that play an important role in the embryogenic development and maintenance of normal tissue. Although several investigations have indicated that immunostaining for these markers can be useful in discriminating between mesotheliomas and adenocarcinomas, others have not confirmed this observation. In an attempt to resolve this controversy, the present study investigated 31 epithelioid mesotheliomas and 29 pulmonary adenocarcinomas for E-cadherin and N-cadherin expression using the 5H9, HECD-1, and clone 36 anti-E-cadherin antibodies, and the 3B9 and clone 32 anti-N-cadherin antibodies. Among the mesotheliomas, 68% reacted with the clone 36, 52% reacted with the HECD-1, and 19% reacted with the 5H9 anti-E-cadherin antibodies, and 74% reacted with the 3B9 and 71% reacted with the clone 32 anti-N-cadherin antibodies. Of the adenocarcinomas, 93% stained with the clone 36, 90% reacted with the HECD-1, and 90% reacted with the 5H9 anti-E-cadherin antibodies, 45% reacted with the clone 32 and 34% reacted with the 3B9 anti-N-cadherin antibodies. Based on the frequent strong reactivity with adenocarcinomas but not with mesotheliomas, it is concluded that only the 5H9 anti-E-cadherin antibody may have some utility in discriminating between epithelioid pleural mesotheliomas and pulmonary adenocarcinomas. The causes of the disparate results reported in the literature on the value of E-cadherin and N-cadherin immunostaining in distinguishing between mesotheliomas and pulmonary adenocarcinomas are unclear, but a significant factor appears to be differences in the reactivity of the antibodies used.
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis*; D000911:Antibodies, Monoclonal; D014408:Biomarkers, Tumor / Q000032:analysis; D015820:Cadherins / Q000032:analysis* / Q000276:immunology; D003937:Diagnosis, Differential; D006801:Humans; D007124:Immunoenzyme Techniques; D008175:Lung Neoplasms / Q000737:chemistry / Q000175:diagnosis*; D008654:Mesothelioma / Q000737:chemistry / Q000175:diagnosis*
chemical_list: D000911:Antibodies, Monoclonal; D014408:Biomarkers, Tumor; D015820:Cadherins