Background: Refractory celiac disease (RCD) is a preneoplastic condition as many patients develop an enteropathy-type T-cell lymphoma, a mature T-cell receptor α-β lymphoma arising in the gut with an ominous outcome. Recently, research focused on a population of intraepithelial intestinal lymphocytes expressing the same lymphoma T-cell receptor variable region (V)γ, as shown by polymerase chain reaction (PCR) analysis and sequencing. Meanwhile, the Biomedicine and Health-2 Concerted Action has made available standardized, highly specific, and sensitive PCR assays not only for Vγ but also for Vβ.
Goals: We verified whether analyzing both rearrangements in duodenal biopsies from RCD patients increases the diagnostic accuracy of this method.
Study: Duodenal biopsies were analyzed from 15 RCD patients, 21 negative controls, and 2 positive controls (enteropathy-type T-cell lymphoma complicating celiac disease). Multiplex clonality analyses were performed according to the Biomedicine and Health-2 protocols. PCR products were cloned and sequenced.
Results: Monoclonal rearrangements were found in 5/15 samples from patients with RCD (both rearrangements in 2 cases, Vβ only in 2, and only 1 solitary Vγ clonality). Monoclonality was found in 4/8 of the RCD patients who subsequently died, whereas only 1/7 of the patients still alive presented a monoclonal rearrangement. Positive controls revealed both monoclonal rearrangements; rearrangements were not detected in 20 of 21 negative controls. Sequencing of the amplified fragments confirmed the results.
Conclusions: The combined analysis of both rearrangements allowed recognition of monoclonal populations in otherwise negative patients, with detection rates from 20% (Vγ only) to 33% (Vγ and Vβ), thus raising the likelihood of early identification of RCD patients at high risk of death.
*Coeliac Centre/First Department of Internal Medicine
†Department of Medical Oncology, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy
This project was supported by a grant from Fondazione Celiachia “Studio di possibili fattori ambientali e sviluppo di nuove strategie terapeutiche nelle complicanze della malattia celiaca.”
The authors declare that they have nothing to disclose.
Reprints: Federico Biagi, MD, Coeliac Centre/First Department of Internal Medicine, Fondazione IRCCS Policlinico San Matteo, University of Pavia, P.le Golgi, 19, I-27100 Pavia, Italy (e-mail: email@example.com).
Received August 7, 2011
Accepted October 26, 2011