Clonality and phenotyping of canine lymphomas before chemotherapy and during remission using polymerase chain reaction (PCR) on lymph node cytologic smears and peripheral blood
- PMID: 20357946
- PMCID: PMC2797355
Clonality and phenotyping of canine lymphomas before chemotherapy and during remission using polymerase chain reaction (PCR) on lymph node cytologic smears and peripheral blood
Abstract
Polymerase chain reaction (PCR) assays for the immunoglobulin and T-cell receptor genes were utilized to determine phenotype and clonality from lymph node cytologic smears and peripheral blood lymphocytes from 10 dogs with lymphoma, before chemotherapy and during remission. Results were compared with those from 13 dogs with a cytologic diagnosis of lymph node hyperplasia. Clonality was identified in 7 of the lymphomas on the basis of either lymph node cytology or peripheral blood lymphocytes before treatment. No lymph node hyperplasia samples were clonal. In 6 of the dogs with lymphoma, clonality was demonstrated during clinical remission. Detection of PCR clonality during clinical remission is an effective means of identifying minimal residual disease in canine lymphoma and thus additional work is warranted to determine if molecular remission is prognostic or predictive for outcome in well-controlled and well-defined lymphoma subtypes.
Clonalité et phénotypage des lymphomes canins avant la chimiothérapie et durant la rémission à l’aide de la réaction d’amplification en chaîne par la polymérase (RCP) sur des frottis cytologiques des ganglions lymphatiques et du sang périphérique. Des essais par réaction d’amplification en chaîne par la polymérase (RCP) pour les gènes récepteurs de l’immunoglobuline et des cellules T ont été utilisés pour déterminer le phénotype et la clonalité à partir de frottis cytologiques des ganglions lymphatiques et de lymphocytes sanguins périphériques provenant de 10 chiens atteints d’un lymphome, avant la chimiothérapie et durant la rémission. Les résultats ont été comparés à ceux de 13 chiens avec un diagnostic cytologique d’hyperplasie des ganglions lymphatiques. La clonalité a été identifiée dans 7 des lymphomes en se fondant sur la cytologie des ganglions lymphatiques ou des lymphocytes sanguins périphériques avant le traitement. Aucun échantillon d’hyperplasie des ganglions lymphatiques n’était clonal. Chez 6 des chiens atteints de lymphome, la clonalité a été démontrée durant la rémission clinique. La détection de la clonalité de la RCP durant une rémission clinique représente un moyen efficace d’identifier une maladie résiduelle minime pour le lymphome canin et des travaux supplémentaires sont donc nécessaires pour déterminer si la rémission moléculaire représente un pronostic ou une prédiction des résultats dans des sous-types de lymphomes bien contrôlés et bien définis.
(Traduit par Isabelle Vallières)
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