Author of

• 18974

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  P3.02 - Biology/Pathology (ID 620)

  • Event: WCLC 2017
  • Type: Poster Session with Presenters Present
  • Track: Biology/Pathology
  • Presentations: 1
  • Moderators:
  • Coordinates: 10/18/2017, 09:30 - 16:00, Exhibit Hall (Hall B + C)

  • 24022

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    P3.02-074 - Podoplanin-Positive CAF Is Associated with a Higher Number of Single Nucleotide Variants in Cancer Cells in Lung Adenocarcinoma (ID 9885)

    09:30 - 09:30  |  Author(s): S. Okada
    • Abstract

    Background:
    Podoplanin-positive cancer-associated fibroblasts (CAFs) play an essential role in tumor progression. However, it is still unclear whether specific genomic alterations of cancer cells are required to recruit podoplanin-positive CAFs. The aim of this study was to investigate the relationship between the mutation status of lung adenocarcinoma cells and the presence of podoplanin-positive CAFs.
    
    Method:
    Ninety-seven lung adenocarcinomas for which whole exome sequencing data were available were enrolled. First, we analyzed the clinicopathological features of the cases with podoplanin-positive CAFs, and then, we evaluated the relationship between genetic features of cancer cells (major driver mutations and the number of single nucleotide variants, or SNVs) and the presence of podoplanin-positive CAFs.
    
    Result:
    Patients with podoplanin-positive CAFs had a significantly lower 5-year recurrence-free proportion than those with podoplanin-negative CAFs (p = 0.027). We could not find any significant correlations between major genetic mutations (EGFR, KRAS, TP53, MET, ERBB2, BRAF, and PIC3CA) in cancer cells and the presence of podoplanin-positive CAFs. However, cases with podoplanin-positive CAFs had a significantly higher number of SNVs in cancer cells than the podoplanin-negative CAFs cases (median; 84 vs 37, respectively; p = 0.001). This was also detected in a non-smoker subgroup (median: 64 vs 32, respectively; p = 0.037). Multivariate analyses revealed that the number of SNVs in cancer cells was the only statistically significant independent predictor for the presence of podoplanin-positive CAFs (p = 0.044).
    
    Conclusion:
    In lung adenocarcinoma, the presence of podoplanin-positive CAFs was associated with higher numbers of SNVs in cancer cells, suggesting a relationship between accumulations of SNVs in cancer cells and the generation of a tumor- promoting microenvironment.