PAX-5 Positivity in Anaplastic Lymphoma Kinase–Negative Anaplastic Large Cell Lymphoma: A Case Report and Review of Literature. (June 2017)

• Record Type: Journal Article
• Authors: Arun, Indu; Roy, Paromita; Arora, Neeraj; Bhave, Saurabh Jayant; Nair, Reena; Chandy, Mammen
• Is Part Of: International journal of surgical pathology. Volume 25:Number 4(2017)
• Page Start: 333
• Page End: 338
• Publication Date: 2017-06
• Subjects: ALK negative -- anaplastic large cell lymphoma -- immunohistochemistry -- PAX-5 positivity -- clonal T-cell receptor gene rearrangement; Pathology, Surgical -- Periodicals; 617.07
• DOI: 10.1177/1066896916683447
• Languages: English
• ISSNs: 1066-8969

Abstract

Anaplastic lymphoma kinase (ALK)–negative anaplastic large cell lymphoma (ALCL) is a subtype of T-cell lymphomas that may mimic several other malignancies morphologically. With the help of immunohistochemistry, most cases of ALCL can be diagnosed on the basis of expression of T-cell lineage associated antigens. However, aberrations in the expression of immunohistochemical markers pose diagnostic challenges. The morphological and immunophenotypic features of ALCL show considerable overlap with classical Hodgkin lymphoma (CHL), which is a B-cell lymphoma. The 2008 World Health Organization Classification of Tumours of Haematopoietic and Lymphoid Tissues suggests that staining for the B-cell transcription factor, paired box 5 (PAX-5), is helpful in differentiating between them, as it is weakly positive in most CHL and should be negative in ALCL. We report a rare case of ALK-negative ALCL, which was positive for PAX-5 and CD15, mimicking CHL by immunohistochemistry, resulting in a diagnostic dilemma.