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K. Fujitaka



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    OA 12 - Emerging Genomic Targets (ID 679)

    • Event: WCLC 2017
    • Type: Oral
    • Track: Advanced NSCLC
    • Presentations: 1
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      OA 12.03 - Clinical Features of Advanced Lung Cancer Harboring HER2 Aberrations: A Large Prospective Cohort Study (HER2-CS STUDY) (ID 8694)

      11:20 - 11:30  |  Author(s): K. Fujitaka

      • Abstract
      • Presentation
      • Slides

      Background:
      HER2 is a potential driver oncogene. HER2-targeted precision therapy has been tested in NSCLC. However, the demographics of HER2-positive NSCLC have not been defined systematically.

      Method:
      Pts with advanced NSCLC were registered. HER2-IHC and FISH assays were performed with commercial kits. HER2 mutations were identified by the direct sequencing. The aim of this study was to clarify the frequency, characteristics and outcome of HER2-positive NSCLC.

      Result:
      Of 1,126 tumors screened (Table A), 34 (3.0%) were IHC3+, and 34 (3.0%) were IHC2+/FISH+. Among the 724 EGFR wild-type tumors, 21 (2.9%) were HER2-mutant tumors, including A775_G776insYVMA (n = 15). Interestingly, the IHC3+ tumors and mutant tumors were entirely exclusive. Female pts had HER2 mutant tumors more frequently, while IHC/FISH+ tumors were detected more often in males (Table B). HER2-positive tumors had similar survival outcome to triple negative tumors, but significantly worse prognoses than EGFR-mutant and ALK-positive tumors (p < 0.05 each). The treament info will be presented at the meeting.

      A. The Genotype-Specific Subsets*
      HER2 (n = 88) EGFR (n = 358) ALK (n = 44) Triple negative /unknown (n = 662) Total (n = 1,126)
      Age, median Sex (male) Smoking habit Non-Sq Stage III/IV 69 61 (69%) 58 (66%) 78 (89%) 51 (58%) 69 142 (40%) 142 (40%) 351 (98%) 220 (61%) 62 21 (48%) 19 (43%) 44 (100%) 35 (80%) 69 516 (78%) 544 (82%) 503 (76%) 423 (64%) 69 726 (64%) 754 (67%) 951 (84%) 714 (63%)
      MST (mo) 1-yr OS rate 17.5 59% NR 85% NR 79% 15.1 59% 19.8 67%
      B. The Subsets of HER2 aberrations**
      IHC3+ (n = 34) IHC2+/FISH+ (n = 34) Mutant (n = 21)
      Age, median Sex (male) Smoking habit Non-Sq Stage III/IV 71 27 (79%) 24 (71%) 30 (88%) 17 (50%) 71 27 (79%) 26 (76%) 28 (82%) 21 (62%) 65 8 (38%) 9 (43%) 21 (100%) 14 (67%)
      MST (mo) 1-yr OS rate 10.5 46% 16.0 70% NR 59%
      *including 22 pts with HER2-positive tumors with EGFR mutations, 2 with both HER2- and ALK-positive tumors, and 2 had ALK-positive tumors with EGFR-mutations. ** 1 had an IHC2+/FISH+ tumor with mutation.

      Conclusion:
      This is the first prospective study showing a small fraction of NSCLC possessed HER2 aberrations. HER2-positive tumors had relatively poor prognosis. NSCLCs with HER2 IHC3+ and mutation seem to be distinct subsets.

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