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DOI: 10.1055/s-2004-831850
© Georg Thieme Verlag Stuttgart · New York
Expressionsmuster und prognostische Bedeutung von CD24, p53 und p21 in Lymphomen
Eine Gewebe-Mikroarray-Studie an über 600 Non-Hodgkin-LymphomenExpression profile and prognostic significance of CD24, p53 and p21 in Non-Hodgkin-LymphomasPublikationsverlauf
eingereicht: 4.6.2004
akzeptiert: 25.8.2004
Publikationsdatum:
28. September 2004 (online)

Hintergrund und Fragestellung: Gewebemikroarrays („tissue microarrays“, TMA) erlauben eine simultane, rasche und standardisierte In-situ-Untersuchung von bis zu 1000 verschiedenen Gewebeproben auf einem Objektträger. In dieser Studie untersuchten wir das Expressionsprofil und die prognostische Bedeutung von CD24, p53 und p21 an einem Non-Hodgkin-Lymphom-Gewebemikroarray.
Methodik: 603 gut dokumentierte Non-Hodgkin-Lymphome wurden in ein Array-Format gebracht (341 diffus großzellige B-Zell-Lymphome, 86 follikuläre Lymphome, 81 chronische lymphatische Leukämien/kleinlymphozytische Lymphome, 51 primär mediastinale diffus großzellige B-Zell-Lymphome, 26 Mantelzelllymphome, 8 lymphoplasmozytische Lymphome, 8 nicht näher spezifizierte T-Zell-Lymphome und 2 Burkitt-Lymphome). Die Expression von CD24, p53 und p21 wurde immunhistochemisch analysiert und semiquantitativ ausgewertet. Der Immunphänotyp p53+/p21- diente als Surrogatmarker (Δ-p53) für p53-Genmutationen. Bei den diffus großzelligen B-Zell-Lymphomen wurde die Markerexpression mit klinischen Daten und dem Gesamtüberleben korreliert.
Ergebnis: 473 von 522 aller auswertbaren Non-Hodgkin-Lymphome (91%) waren CD24 positiv. Die CD24-Expression war nicht mit dem Gesamtüberleben assoziiert. Ein Δ-p53 wurde in 70 von 539 auswertbaren Lymphomen (13%) gefunden. Am häufigsten fand sich ein Δp53 bei diffus großzelligen B-Zell-Lymphomen (21%). In der multivariaten Cox-Regressions-Analyse waren ein hoher internationaler prognostischer Index sowie ein Δp53 unabhängige Parameter für ein schlechtes Gesamtüberleben.
Folgerung: Die Gewebemikroarray-Technik erlaubt auch in der Lymphomforschung eine bisher in dieser Form nicht mögliche, effiziente, simultane und weitgehend standardisierte klinisch-pathologische Analyse großer Patientengruppen. Immunhistochemisch bestimmtes Δp53 ist ein unabhängiger negativer Prognosefaktor bei diffus großzelligen B-Zell-Lymphomen und kann problemlos routinemäßig bestimmt werden.
Background and objective: Tissue microarrays allow the simultanous, rapid and standardized in-situ analysis of up to 1000 different tissue samples on a single glass slide. We investigated the expression profil and the prognostic significance of CD24, p53 and p21 using a Non-Hodgkin-Lymphoma tissue microarray.
Methods: Over 600 well documented Non-Hodgkin-Lymphomas, consisting of 341 diffuse large B-cell lymphomas, 86 follicular lymphomas, 81 chronic lymphatic leukemias/small lymphocytic lymphomas, 51 primary mediastinal diffuse large B-cell lymphomas, 26 mantle cell lymphomas, 8 lymphoplasmocytic lymphomas, 8 T-cell-lymphomas NOS und 2 Burkitt lymphomas were brought into array format. The expression of CD24, p53 and p21 was analysed semiquantitatively by immunohistochemistry. The immunophenotype p53+/p21- (Δp53) was used as a surrogat for p53 gene mutations. The expression profile was compared to clinical data and the overall survival in the subgroup of diffuse large B-cell lymphomas.
Results: 91% of the analyzed Non-Hodgkin-lymphomas (473 of 522 cases) showed CD24 positivity. CD24 Expression was not associated with survival. Δp53 was found in thirteen percent of all lymphomas (70 of 539 cases), the subgroup of the diffuse large B-cell lymphomas demonstrated the highest Δp53 (21%). In a multivariate cox regression analysis, a high international prognostic index and Δp53 were independent markers of bad survival.
Conclusion: The TMA-technology allows also in lymphoma research the simultanous, cost-effective and standardized analysis of large patient cohorts. Δp53 revealed as an independent negative prognostic factor in diffuse large B-cell lymphomas. It can easily be determined in daily routine practice.
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Priv.-Doz. Dr. med. Stephan Dirnhofer
Institut für Pathologie, Universität Basel
Schönbeinstraße 40
CH-4031 Basel
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eMail: sdirnhofer@uhbs.ch