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Trametinib for the treatment of recurrent/progressive pediatric low-grade glioma

  • Clinical Study
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Abstract

Purpose

Pediatric low-grade gliomas (pLGGs) are the most common CNS tumor of childhood and comprise a heterogenous group of tumors. Children with progressive pLGG often require numerous treatment modalities including surgery, chemotherapy, rarely radiation therapy and, more recently, molecularly targeted therapy. We describe our institutional experience using the MEK inhibitor, trametinib, for recurrent/progressive pLGGs.

Methods

We performed a retrospective, IRB-approved, chart review of all pediatric patients treated with trametinib for recurrent/progressive pLGGs at Dana-Farber/Boston Children’s Cancer and Blood Disorder Center between 2016 and 2018.

Results

Eleven patients were identified, of which 10 were evaluable for response. Median age at commencement of trametinib treatment was 14.7 years (range 7.3–25.9 years). Tumor molecular status included KIAA1549-BRAF fusion (n = 4), NF1 mutation (n = 4), FGFR mutation (n = 1) and CDKN2A loss (n = 1). Median number of prior treatment regimens was 5 (range 1–12). Median duration of treatment with trametinib was 19.2 months (range 3.8–29.8 months). Based on modified RANO criteria, best responses included partial (n = 2), minor response (n = 2) and stable disease (n = 6). Two patients remain on therapy (29.8 and 25.9 months, respectively). The most common toxicities attributable to trametinib were rash, fatigue and gastrointestinal disturbance. Five patients required dose reduction for toxicities. Two patients experienced significant intracranial hemorrhage (ICH) while on trametinib. While it is unclear whether ICH was directly attributable to trametinib, therapy was discontinued.

Conclusion

Trametinib appears to be an effective treatment for patients with recurrent/progressive pLGG. The toxicities of this therapy warrant further investigation, with particular attention to the potential risk for intracranial hemorrhage. Early phase multi-institutional clinical trials are underway.

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Authors and Affiliations

  1. Dana-Farber Cancer Institute, Boston Children’s Cancer and Blood Disorder Center, 450 Brookline Ave, Boston, MA, 02215-5450, USA

    Neevika Manoharan, Christine Chordas, Mary Ann Zimmerman, Jacqueline Scully, Jessica Clymer, Mariella Filbin, Nicole J. Ullrich, Pratiti Bandopadhayay, Susan N. Chi & Kee Kiat Yeo

  2. Kids Cancer Centre, Sydney Children’s Hospital, Sydney, Australia

    Neevika Manoharan

  3. Department of Radiology, Boston Children’s Hospital, Boston, USA

    Jungwhan Choi

  4. Department of Neurology, Boston Children’s Hospital, Boston, USA

    Nicole J. Ullrich

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  1. Neevika Manoharan
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  10. Susan N. Chi
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  11. Kee Kiat Yeo
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Manoharan, N., Choi, J., Chordas, C. et al. Trametinib for the treatment of recurrent/progressive pediatric low-grade glioma. J Neurooncol 149, 253–262 (2020). https://doi.org/10.1007/s11060-020-03592-8

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