Author of

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  P3.18 - Poster Session 3 - Pathology (ID 177)

  • Event: WCLC 2013
  • Type: Poster Session
  • Track: Pathology
  • Presentations: 1
  • Moderators:
  • Coordinates: 10/30/2013, 09:30 - 16:30, Exhibit Hall, Ground Level

  • 12774

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    P3.18-005 - EGFR mutation testing methods in clinical practice in Central Europe: findings from the INSIGHT observational study (ID 1639)

    09:30 - 09:30  |  Author(s): B. Robesova
    • Abstract

    Background
    The INSIGHT observational study aimed at assessing the management of NSCLC patients with EGFR mutations in clinical practice in Central Europe. As part of this project, pathological findings including molecular testing methods were assessed.

    Methods
    Fourteen Pathology Departments from 6 Central European countries participated. Between 15 November 2011 and 31 March 2013, EGFR mutations were determined by one of the established standard methods in patients with NSCLC.

    Results
    Here we report data on 1009 patients who had been enrolled into the INSIGHT study. These patients consisted of 626 (62%) males and 383 (38%) females, 347 (35%) smokers, 452 (46%) former smokers and 182 (19%) never-smokers. Pathological diagnosis was based on histology (41%), cytology (19%) or both (40%) and revealed the following results: 54% non-mucinous adenocarcinomas, 4% mucinous adenocarcinomas, 21% unspecified adenocarcinomas, 9% NSCLC NOS, 7% squamous cell carcinomas, 2% adenosquamous carcinomas, and 2% others. Tumor material was obtained by bronchoscopy (44%), transthoracic needle biopsy (11%), surgery (19%), or other techniques. Specimens were either from primary tumor (88%), lymph node metastases (2.5%) or distant metastases (9.5%). EGFR mutation testing was done by PCR-RFLP (43%), Roche Cobas EGFR mutation test (26%), Sanger sequencing (18%), high resolution melting followed by sequencing (13%) or another method (11%). EGFR mutations were found in 163 (16%) of the patients. Among patients with mutations, the following mutations were found: 12 (7% of mutation-positive patients) exon 18 mutations, 82 (50%) exon 19 mutations including 63 (39%) deletions, 20 (12%) exon 20 mutations including 3 (2%) T790M, 63 (39%) exon 21 mutations including 45 (28%) L858R. Multiple mutations, both common and uncommon, were found in 12 (7%) of the patients. Mutations were found in 8% of smokers, 14% of former smokers and 43% of never-smokers. Mutations rates varied between centers which most likely reflected different patient selection criteria for EGFR mutation testing.

    Conclusion
    The INSIGHT project demonstrated that EGFR mutation testing by one of the standard tests in patients with NSCLC has been established in participating centers in Central Europe. EGFR mutation distribution is similar to other European and American NSCLC patient populations. This study was supported by Boehringer Ingelheim Regional Center Vienna.