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Sind primär extranodale diffuse großzellige B-Zell-Lymphome organotypische Erkrankungen?

Extranodal diffuse large B-cell lymphoma – an organotypic disease?

  • Schwerpunkt: Lymphome als Organerkrankungen
  • Published:
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Zusammenfassung

Etwa 30–40% diffuser großzelliger B-Zell-Lymphome (DLBCL) entstehen primär extranodal. Am häufigsten treten sie im Gastrointestinaltrakt auf, überwiegend im Magen, häufiger aber auch in ZNS, Hoden, Lunge oder Haut. Morphologisch zeigen die Tumorzellen das gesamte Spektrum peripherer B-Blasten: Zentroblasten, Immunoblasten oder Plasmoblasten. Von primär nodalen (häufig systemischen) DLBCL sind sie morphologisch also kaum abzugrenzen. Neuere Daten deuten aber darauf hin, dass sich extranodale DLBCL insbesondere in ihren molekularen Charakteristika von nodalen Tumoren (und auch untereinander) unterscheiden und häufig organotypische Eigenschaften aufweisen. Diese betreffen zum einen eine besondere organotypische und/oder klinische Präsentation, wie sie typisch für die in der WHO-Klassifikation definierten Subtypen der DLBCL (primär mediastinales DLBCL, intravaskuläres DLBCL, primäres Ergusslymphom) ist. Zum anderen zeigen primär extranodale DLBCL in der Regel eine gegenüber nodalen Tumoren divergente genetische Konstitution mit besonderen entitätsspezifischen Aberrationen, die wiederum mit dem besonderen Entstehungsort der Tumoren assoziiert scheint, wie z. B. die häufige Deletion des HLA-Genlocus in DLBCL immunprivilegierter Lokalisationen wie ZNS oder Hoden. Schließlich sprechen z. T. sicherlich noch präliminäre Daten für eine besondere organotypische Genexpressionssignatur primär extranodaler DLBCL und damit für offenbar organotypische – unterschiedliche – Transformationswege.

Abstract

Roughly 30–40% of diffuse large B-cell lymphomas (DLBCL) arise primarily in extranodal sites. Most frequently, they occur in the gastrointestinal tract, especially in the gastric mucosa. They also occur in the central nervous system, as testicular lymphomas, in the lungs, or in the skin. Morphologically, they show the whole spectrum of peripheral B-blasts: centroblasts, immunoblasts, or plasmoblasts. Thus, there is no actual difference in their cytomorphological presentation compared to their nodal—and frequently systemic—counterparts. However, recent data point to profound differences in primary extranodal DLBCL compared to primary nodal tumors, as well as to each other, frequently relating to their molecular characteristics and especially implying organotypic features. These characteristics may relate to a particular organotypic site of origin, or the particular clinicopathogenetic setting in which the tumors arise. This is exemplified in the description of the DLBCL subtypes as defined by the World Health Organization classification (mediastinal or intravascular B-cell lymphoma; primary effusion lymphoma). On the other hand, primary extranodal DLBCL are frequently characterized by a particular (cyto-)genetic constitution, often related to their site of origin. Finally, some preliminary data on gene expression profiling strongly argue in favor of particular gene signatures for primary extranodal DLBCL, and hence in favor of particular organotypic transformation pathways.

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Ott, G., Rosenwald, A. Sind primär extranodale diffuse großzellige B-Zell-Lymphome organotypische Erkrankungen?. Pathologe 28, 29–35 (2007). https://doi.org/10.1007/s00292-006-0883-5

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