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Activity of larotrectinib in TRK fusion cancer patients with primary central nervous system tumours


23 Nov 2019


Poster display session


David Ziegler


Annals of Oncology (2019) 30 (suppl_9): ix122-ix130. 10.1093/annonc/mdz431


D.S. Ziegler1, F. Doz2, B. Geoerger3, S. Dubois4, J.E. Grilley-Olson5, C. van Tilburg6, A. Italiano7, A. Lissat8, J. Kang9, M. Tahara10, V. Boni11, S. Perreault12, M. Capra13, S. Nanda14, N. Brega15, A. Holynskyj16, D.S. Hong17, D. Hyman18, A. Drilon19

Author affiliations

  • 1 Kids Cancer Centre, Sydney Children’s Hospital, 2031 - Randwick/AU
  • 2 Institut Curie, Siredo Oncology Center (care, Innovation And Research For Children And Aya With Cancer), Paris Descartes University, Paris/FR
  • 3 Gustave Roussy Cancer Center, Université Paris-Sud, Université Paris-Saclay, Villejuif/FR
  • 4 Pediatric Oncology, Dana-Farber/Boston Children’s Cancer and Blood Disorders Center, Boston/US
  • 5 Lineberger Cancer Center, University of North Carolina Hospitals, Chapel Hill/US
  • 6 Hopp Children’s Cancer Center Heidelberg (kitz), Heidelberg University Hospital and German Cancer Research Center (DKFZ), Heidelberg/DE
  • 7 Department Of Medical Oncology, Institute Bergonie, Bordeaux/FR
  • 8 Virchow-klinikum Medizinische Klinik Mit Schwerpunkt Kardiologie, Universitätsmedizin Berlin Charite Campus, Berlin/DE
  • 9 Department Of Medical Oncology, Seoul St Marys Hospital, Seoul/KR
  • 10 Head And Neck Medical Oncology, National Cancer Center Hospital East, 277-8577 - Kashiwa/JP
  • 11 Start Madrid, START Madrid CIOCC, Madrid/ES
  • 12 Department Of Neurology, CHU Sainte Justine, Montreal/CA
  • 13 Department Of Radiology, Our Lady Children's Hospital, Dublin/IE
  • 14 Biostatistics, Bayer HealthCare Pharmaceuticals, Inc., Whippany/US
  • 15 Oncology Clinical Department, Bayer HealthCare Pharmaceuticals, Inc., Whippany/US
  • 16 Bayer, Bayer HealthCare Pharmaceuticals, Inc., Whippany/US
  • 17 Department Of Investigational Cancer Therapeutics, MD Anderson Cancer Center, Houston/US
  • 18 Department Of Medicine, Memorial Sloan Kettering Cancer Center and Weill Cornell Medical College, New York/US
  • 19 Thoracic Oncology Service, Division Of Solid Tumor Oncology, Department Of Medicine, Memorial Sloan Kettering Cancer Center, New York/US



TRK fusions are oncogenic drivers of a variety of tumors, many of which can involve the central nervous system (CNS). Larotrectinib is an FDA-approved selective TRK inhibitor for the treatment of TRK fusion cancer (Drilon et al., NEJM 2018). Here we report on the clinical activity of larotrectinib in an expanded set of TRK fusion-positive primary CNS tumors.


Patients with primary CNS tumors harboring an NTRK gene fusion detected by local molecular testing who were treated with larotrectinib in two clinical trials (NCT02637687 and NCT02576431) were identified. Larotrectinib was administered until disease progression, withdrawal, or unacceptable toxicity. Disease status was investigator assessed (RANO). Data cutoff: February 19, 2019.


18 patients with various histological types of glial tumors (11 high grade, 4 low grade, 3 unknown) were identified. The patients had gene fusions involving NTRK2 (n = 13), NTRK1 (n = 3) and NTRK3 (n = 2). Median age was 10.5 years (range 1.3–79.0); 14 patients were pediatric (< 18). In 14 evaluable patients, the objective response rate was 36% (2 CR [pending confirmation], 3 PR), with responses seen in high- and low-grade disease and across histologies. Nine patients had SD. The 24-week disease control rate was 71%. The duration of treatment ranged from 0.03+ to 16.6+ months.


Larotrectinib is active in patients with TRK fusion cancer with intracranial disease. Objective responses and durable disease control were seen in primary CNS tumors of various grades and histologies. These results further support expanded testing for NTRK gene fusions in patients with primary CNS tumors.

Clinical trial identification

NCT02637687 and NCT02576431.

Editorial acknowledgement

Legal entity responsible for the study





All authors have declared no conflicts of interest.

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