Revision as of 13:14, 3 November 2023 by Bailey.Glen(talk | contribs)(Created page with "==Primary Author(s)*== * Kathleen M. Schieffer, PhD * Ruthann Pfau, PhD __TOC__ ==Cancer Category/Type== * Mature B-Cell Neoplasms ==Cancer Sub-Classification / Subty...")
Polymorphic infiltrate composed of small- to medium-sized cells with round nuclei and moderate cytoplasm[3][7]
Starry-sky appearance of residual hyperplastic germinal centers[9]
Immunophenotype
Similar to adult-type NMZL, pNMZL is almost universally positive for the mature B cell marker CD20 (90-100%) with most cases also expressing the pan-T cell marker CD43 (70-100%)[3][6][7][9][14]
A subset of pNMZL express BCL2 (40-50%) and IgD (20-30%)[3][6][7]
pNMZL cells are negative for the germinal center markers CD10, BCL6, CD23, and the T cell markers CD3, CD5[3][6][7][10]
CD279/PD-1 staining present in reactive germinal centers of pNMZL, compared to positive staining at the periphery of germinal centers in nodal pediatric-type follicular lymphoma[9]
Finding
Marker
Positive (universal)
CD19, CD20, sIg (bright, monoclonal), CD43
Positive (subset)
BCL2, CD279/PD-1, IgD
Negative (universal)
CD10, BCL6, CD23, CD5, CD3, LEF1
Chromosomal Rearrangements (Gene Fusions)
No chromosomal rearrangements or gene fusions associated with pNMZL[8]
Clonal rearrangements of immunoglobulin (Ig) region detected in most cases[3][10]
Characteristic Chromosomal Aberrations / Patterns
No characteristic chromosomal aberrations or patterns reported
Genomic Gain/Loss/LOH
Trisomy 3 and 18 are infrequently described chromosomal aberrations reported in pNMZL[10]
These chromosome gains have also been described in adult-type NMZL[2][15][16]
Genes reported to be altered in adult-type NMZL, including MLL2 (KMT2D), PTPRD, NOTCH2, KLF2, and BRAF,[17][18] have not been described in pNMZL[8]
While no recurrent somatic variations have been identified in pNMZL, a somatic variant in AMOTL1 (NM_130847, p.Ala891Thr) was reported in a single individual with pNMZL[8]
Missense alterations in AMOTL1 have been reported in adult splenic marginal zone lymphoma (p.Ala424Thr and p.Val361Ile)[19][20] and other cancers (COSMIC, cBioPortal, PedcBioPortal)
Additional studies are needed to assess the spectrum of somatic variation in pNMZL. A single report evaluated the genetic landscape of pNMZL by whole exome sequencing (n=4) identified missense changes in the following genes: AMOTL1, SCAF1, SELPLG, FAM5B, KLHDC4, RAX, PEG3, CHPF, ACTRT3, NRCAM, CHMP1A, CISH, TTC17, NLE1[8]
Epigenomics (Methylation)
None
Genes and Main Pathways Involved
AMOTL1 encodes angiomotin like-1 which associates with tight junctions and regulates the Hippo signaling pathway[21][22]
Diagnostic Testing Methods
Histopathology and immunophenotyping
Molecular testing (i.e. clonality assessment)
Clinical Significance (Diagnosis, Prognosis and Therapeutic Implications)
No genomic findings currently assist in diagnosis, prognostication, or therapeutic decisions
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