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 Blood, 15 March 2005, Vol. 105, No. 6, pp. 2274-2280.
Prepublished online as a Blood First Edition Paper on November 12, 2004; DOI 10.1182/blood-2004-07-2755.

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REVIEW IN TRANSLATIONAL HEMATOLOGY

Immunoproliferative small intestinal disease (IPSID): a model for mature B-cell neoplasms

Tahseen Al-Saleem, and Hamid Al-Mondhiry

From the Department of Pathology, Fox Chase Cancer Center, Philadelphia, PA; and the Division of Hematology/Oncology, Milton S. Hershey Medical Center, Pennsylvania State University College of Medicine, Hershey, PA.

Abstract

Immunoproliferative small intestinal disease (IPSID) was recently added to the growing list of infectious pathogen-associated human lymphomas. Molecular and immunohistochemical studies demonstrated an association with Campylobacter jejuni. IPSID is a variant of the B-cell lymphoma of mucosa-associated lymphoid tissue (MALT), which involves mainly the proximal small intestine resulting in malabsorption, diarrhea, and abdominal pain. Geographically, IPSID is most prevalent in the Middle East and Africa. IPSID lymphomas reveal excessive plasma cell differentiation and produce truncated {alpha} heavy chain proteins lacking the light chains as well as the first constant domain. The corresponding mRNA lacks the variable heavy chain (VH) and the constant heavy chain 1 (CH1) sequences and contains deletions as well as insertions of unknown origin. The encoding gene sequence reveals a deletion of V region and parts of CH1 domain. Cytogenetic studies demonstrated clonal rearrangements involving predominantly the heavy and light chain genes, including t(9;14) translocation involving the PAX5 gene. Early-stage IPSID responds to antibiotics (30%-70% complete remission). Most untreated IPSID patients progress to lymphoplasmacytic and immunoblastic lymphoma invading the intestinal wall and mesenteric lymph nodes, and may metastasize to a distant organ. IPSID lymphoma shares clinical, morphologic, and molecular features with MALT lymphoma, lymphoplasmacytic lymphoma, and plasma cell neoplasms.


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