CDKN1B/p27 expression in peripheral T cell lymphoma not otherwise specified

Anna Gazzola, Maria Teresa Sista, Claudio Agostinelli, Simona Righi, Maria Rosaria Sapienza, Claudia Mannu, Maura Rossi, Francesco Bacci, Elena Sabattini, Philip Went, Pier Luigi Zinzani, Stefano A. Pileri, Pier Paolo Piccaluga

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Abstract

Aims: Peripheral T cell lymphoma not otherwise specified (PTCL/NOS) is the commonest PTCL subtype. Recently, proliferation pathways have been found to be commonly altered in PTCL/NOS. CDKN1B/p27, a critical regulator of cell cycle and proliferation, has been suggested to be involved in T cell lymphomagenesis. This study aimed to evaluate the possible occurrence of CDKN1B/p27 aberrations in PTCL/NOS. Methods: CDKN1B/p27 expression at RNA and protein level by DNA and tissue microarrays, in 28 and 98 cases, respectively, was studied. Additionally, direct sequencing of CDKN1B in 81 PTCL/NOS was performed. Results: CDKN1B mRNA was similarly expressed in PTCL/NOS and normal T lymphocytes. In addition, structural abnormalities were not found; these included mutations and deletions in any exons, exon-intron junctions or regulatory regions. Furthermore, physiological expression of p27 in neoplastic cells was demonstrated by immunohistochemistry; this was mutually exclusive with Ki-67, as expected when the system is intact. Consistently, the expression of other molecules that are functionally related to CDKN1B/p27 in controlling cell cycle (including CCNE1) did not appear to be affected at either the mRNA or protein level. Finally, it was found that p27 expression was not significantly related with overall survival. Conclusion: CDKN1B/p27 aberrations seem to be uncommon in PTCL/NOS pathogenesis.

Original languageEnglish
Pages (from-to)83-87
Number of pages5
JournalJournal of Clinical Pathology
Volume64
Issue number1
DOIs
Publication statusPublished - Jan 2011

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ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Cite this

Gazzola, A., Sista, M. T., Agostinelli, C., Righi, S., Sapienza, M. R., Mannu, C., Rossi, M., Bacci, F., Sabattini, E., Went, P., Zinzani, P. L., Pileri, S. A., & Piccaluga, P. P. (2011). CDKN1B/p27 expression in peripheral T cell lymphoma not otherwise specified. Journal of Clinical Pathology, 64(1), 83-87. https://doi.org/10.1136/jcp.2010.083832