title: bc1-1 rearrangement and cyclin D1 protein expression in multiple lymphomatous polyposis.
abstract: Multiple lymphomatous polyposis (MLP), characterized by multiple polyps involving long segments of the gastrointestinal (GI) tract, is believed to represent GI involvement by mantle cell lymphoma (MCL), primarily based on its histologic and immunophenotypic similarities with MCL. However, rearrangement of the bcl-1 locus, the molecular lesion characteristic of MCL, has not been investigated in this group of patients. The authors evaluated the morphologic, immunophenotypic, and molecular features of 18 cases of MLP and 8 B-cell lymphomas involving the GI tract (including 6 MALT lymphomas). All MLP cases presented with GI disease, and were histologically similar to MCL. DNA extracted from formalin-fixed, paraffin-embedded tissue was analyzed for evidence of bcl-1 rearrangement by PCR, using chromosome 11 specific and consensus JH primers. Amplifiable DNA was obtained in 24 of 26 cases (16 of 18 MLP cases and 8 of 8 controls). bcl-1 rearrangement was detected in 6 of 16 cases (38%), subsequently confirmed by sequencing of the breakpoint region, and in 0 of 8 controls. Immunostaining for cyclin D1 was positive in 14 of 18 MLPs, including the 6 bcl-1 rearranged cases and negative in 6 of 6 evaluable controls. The detection of bcl-1 rearrangement and cyclin D1 expression in cases of MLP supports the view that MLP represents primary MCL, of the GI tract. These techniques may also be helpful in differentiating MLP from other GI lymphomas, particularly low grade lymphomas of MALT, when only small routinely fixed endoscopic biopsies are available.
authors.affiliation: Laboratory of Pathology, National Cancer Institute, Bethesda, MD 20892, USA.
authors.forename: S
authors.initials: S
authors.lastname: Kumar
authors.forename: L
authors.initials: L
authors.lastname: Krenacs
authors.forename: T
authors.initials: T
authors.lastname: Otsuki
authors.forename: D
authors.initials: D
authors.lastname: Kumar
authors.forename: C A
authors.initials: CA
authors.lastname: Harris
authors.forename: A
authors.initials: A
authors.lastname: Wellmann
authors.forename: E S
authors.initials: ES
authors.lastname: Jaffe
authors.forename: M
authors.initials: M
authors.lastname: Raffeld
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001483:Base Sequence; D019938:Cyclin D1; D016213:Cyclins / Q000235:genetics*; D005260:Female; D015322:Gene Rearrangement, B-Lymphocyte; D006801:Humans; D007150:Immunohistochemistry; D007417:Intestinal Polyps / Q000235:genetics* / Q000473:pathology; D018442:Lymphoma, B-Cell, Marginal Zone / Q000235:genetics* / Q000473:pathology; D008228:Lymphoma, Non-Hodgkin / Q000235:genetics* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D015513:Oncogene Proteins / Q000235:genetics*; D011519:Proto-Oncogenes
chemical_list: D016213:Cyclins; D015513:Oncogene Proteins; D019938:Cyclin D1