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M.A. Abdul Hamid



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    MO03 - Thymic Malignancies (ID 123)

    • Event: WCLC 2013
    • Type: Mini Oral Abstract Session
    • Track: Medical Oncology
    • Presentations: 1
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      MO03.09 - Detection of Human Polyomavirus 7 in thymomas (ID 1829)

      11:20 - 11:25  |  Author(s): M.A. Abdul Hamid

      • Abstract
      • Presentation
      • Slides

      Background
      Thymomic pathologies are associated with the autoimmune disease myasthenia gravis (MG). The thymomagenesis have been studied extensively but the etiology of human thymoma remains poorly understood. Based on the consistent finding that murine polyomavirus induces thymomas in mice we tested the presence of Human Polyomavirus 7 (HPyV7) in human thymic epithelial tumors.

      Methods
      We applied HPyV7 DNA Fluorescence in situ hybridization (FISH), DNA PCR and immunohistochemistry (IHC) in 37 thymomas (19 female, 18 male; mean age 58.3 years; range 34 – 82 years). Of these, 26 were previously diagnosed with MG. In addition, 2 thymic carcinomas, 20 follicular hyperplasia and 20 fetal thymus tissues were tested for HPyV7.

      Results
      HPyV7 FISH revealed specific nuclear hybridization signals within the thymoma cells of 23 thymomas (62.2%). Fifteen thymomas revealed strong to very strong hybridization signals, whereas 8 revealed only weak positivity. With one exception the HPyV7 FISH data highly correlated with the HPyV7 DNA-PCR data. IHC showed the presence of HPyV7 on the translational level and immunohistochemical double stainings confirmed the presence of HPyV7 in the epithelial thymoma cellular compartment. One thymus carcinoma was HPyV7 positive the other negative. All fetal thymus tissues were tested HPyV7 negative. The follicular hyperplasia results are pending.

      Conclusion
      We conclude that HPyV7 is frequently present in human thymic epithelial tumors and absent in fetal thymic tissues. No convincing association on HPyV7 and MG could be found. In as much HPyV7 is of relevance to human thymomagenesis remains to be established.

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