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  EP1.03 - Biology (ID 193)

  • Event: WCLC 2019
  • Type: E-Poster Viewing in the Exhibit Hall
  • Track: Biology
  • Presentations: 1
  • Now Available
  • Moderators:
  • Coordinates: 9/08/2019, 08:00 - 18:00, Exhibit Hall

  • 31926

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    EP1.03-30 - FAM83A and FAM83B as Prognostic Biomarkers and Potential New Therapeutic Targets in NSCLC (Now Available) (ID 587)

    08:00 - 18:00  |  Author(s): Arne Warth
    • Abstract
    • Slides

    Background
    

    Although targeted therapy improved survival rates in the last decade, non-small cell lung cancer (NSCLC) is still the most common cause of cancer related death. As most precision medicines lead to resistance, the challenge of identifying new targets for further effective therapies still remains. The FAMily with sequence similarity 83 (FAM83) members have recently been described as novel oncogenes in numerous human cancer specimens and shown to be involved in EGFR signaling. However, their function in cancer cells is largely unknown and especially their role in lung cancer remains unclear.

    Method
    

    Here, we investigated the expression and function of FAM83A and B in NSCLC. First, gene expression of the two FAM83 members was analyzed in a set of 362 NSCLC patients using qPCR. We further investigated relations in expression and their prognostic value using correlation and multivariate COX regression analyses. Functional assays in NSCLC cell lines were performed to analyze their involvement in proliferation, anchorage-independent growth, migration and the epidermal growth factor receptor (EGFR) pathway.

    Result
    

    We observed a highly increased gene expression level of FAM83A (ø = 68-fold) and FAM83B (ø = 20-fold) which resulted in poor survival prognosis (p < 0.0001 and p = 0.002). Correlation analysis showed poor relation between FAM83A and B in the two sub-histologies adenocarcinoma (ADC) and squamous cell carcinoma (SQCC) but confirmed correlation between FAM83A and B and EGFR expression levels in patients and cell lines. Their expression was further influenced by EGFR pathway signaling and mutation status. Both genes affected cell proliferation and FAM83A depletion resulted in reduced migration and AIG.

    Conclusion
    

    The results support the hypothesis that FAM83A and B have different specific functions in the histological subtypes of NSCLC and might be new therapeutic targets.

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