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R. Cathomas



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    MA 15 - Lung Cancer Biology II (ID 670)

    • Event: WCLC 2017
    • Type: Mini Oral
    • Track: Biology/Pathology
    • Presentations: 1
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      MA 15.11 - CCNE1, PTGS2, TGFA and WISP2 Predict Benefit from Bevacizumab and Chemotherapy in Patients with Advanced Non-Small Cell Lung Cancer (SAKK19/09) (ID 9592)

      15:45 - 17:30  |  Author(s): R. Cathomas

      • Abstract
      • Presentation
      • Slides

      Background:
      Bevacizumab (Bev; Avastin[®]) is a monoclonal antibody against the vascular endothelial growth factor. No predictive biomarkers for the use of Bev have been established so far. We aimed identifying genes predictive for progression-free survival (PFS) and overall survival (OS) of patients treated in the trial SAKK19/09 (NCT01116219).

      Method:
      SAKK19/09 was a non-randomized phase II trial with two sequential cohorts including patients with non-squamous NSCLC and EGFR wild-type. In Cohort 1, 77 patients were treated with cisplatin (C) 75mg/m[2], pemetrexed (Pem) 500mg/m[2] and Bev 7.5mg/kg, followed by Bev+Pem maintenance. Cohort 2 included 52 patients treated with C+Pem followed by Pem maintenance. RNA was isolated from baseline tumor tissue sections and processed for gene expression analysis by Nanostring. Using the Nanostring nCounter® System (Nanostring Technologies) gene expression of 201 genes, including 6 housekeeping genes was measured using a custom-designed codeset. For each gene, a Cox regression was performed with normalized gene expressions, treatment and the interaction for PFS and OS. No adjustment for multiple testing was done.

      Result:

      Gene Accession HR (95% confidence interval) p-value of interaction
      Cohort 1 Cohort 2
      Potential predictive markers for PFS
      AURKB NM_004217 1.09 (0.84-1.42) 0.78 (0.61-0.99) 0.0481
      CCNE1 NM_001238 1.09 (0.87-1.36) 0.73 (0.53-1.02) 0.0312
      CDKN2B NM_004936.3 0.80 (0.67-0.95) 1.10 (0.85-1.43) 0.0375
      MMP2 NM_004530.2 0.81 (0.67-0.97) 1.10 (0.91-1.34) 0.0258
      PTGS2 (COX-2) NM_000963.1 1.29 (1.06-1.58) 0.90 (0.78-1.04) 0.00352
      TGFA NM_003236.2 1.13 (0.94-1.37) 0.74 (0.53-1.03) 0.0452
      WISP2 NM_003881.2 0.82 (0.69-0.98) 1.24 (1.02-1.51) 0.0015
      Potential predictive markers for OS
      CCNE1 NM_001238 1.08 (0.86-1.36) 0.71 (0.49-1.02) 0.0324
      PTGS2 (COX-2) NM_000963.1 1.35 (1.10-1.65) 0.81 (0.69-0.95) <0.0001
      TGFA NM_003236.2 1.17 (0.96-1.43) 0.55 (0.33-0.91) 0.00352
      WISP2 NM_003881.2 0.87 (0.73-1.03) 1.14 (0.92-1.42) 0.0314
      We analyzed 99 patient samples (61 in Cohort 1; 38 in Cohort 2) with 201 genes at baseline. We found 7 genes potentially predictive for PFS (AURKB, CCNE1, CDKN2B, MMP2, PTGS2, TGFA, WISP2), 4 of which were also potentially predictive for OS (CCNE1, PTGS2, TGFA and WISP2) (Table 1).

      Conclusion:
      We identified several potentially predictive genes for Bev activity in combination with chemotherapy. Several of these (AURKB, CCNE1, CDKN2B, TGFA) have previously been shown to play an important role in cell cycle regulation and cell proliferation supporting the hypothesis that Bev supports chemotherapy activity. Notably, also a gene involved in inflammation (PTGS2) was significantly predictive for outcome. Further work is ongoing to explore changes in gene expression using tumor rebiopsies at progression.

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