Abstract
p53 is a tumor suppressor gene that commonly undergoes mutations in human tumors, including lymphomas. Because p53 mutations are not restricted to a single locus, immunohistochemistry is useful to detect p53 expression and correlate this finding with lymphoma phenotype. Cryostat sections from 125 cases of lymphoma were analyzed for p53 expression using three different monoclonal antibodies (pAb 421, 1801, 240) which react with human cellular p53 and a common conformational epitope on mutant p53. A control antibody (pAb 246) reacts only with wild type p53 of murine origin and was negative in all cases. Tissue from 29 cases of lymphoid hyperplasia, including six from human immunodeficiency virus-positive (HIV+) patients, were negative for p53. p53 was predominantly localized in nuclei of high-grade lymphomas, including 14 of 46 cases of B cell immunoblastic lymphomas and two of five T cell immunoblastic lymphomas. p53 expression was relatively common in lymphomas from HIV+ patients, and unusual in intermediate and low-grade lymphomas of follicular center cell type. Low-grade lymphoma of small lymphocytic type disclosed p53+ large cells (paraimmunoblasts) that may play a role in tumor progression in this lymphoma subtype. p53 was also strongly expressed in the nuclei of Reed Sternberg cells from 19 of 37 cases of Hodgkin's disease, including six cases of mixed cellularity, and 13 cases of nodular sclerosing type. Immunohistochemical staining is a rapid method to identify p53 expression in lymphomas.
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