for people ages 6 months to 25 years (full criteria)
study started
estimated completion



FIREFLY-1 is a Phase 2, multi center, open-label study to evaluate the safety and efficacy of oral pan-RAF inhibitor DAY101 in pediatric, adolescent, and young adult patients with recurrent or progressive low-grade glioma harboring a known BRAF alteration.

Official Title

FIREFLY-1: A Phase 2, Open-Label, Multicenter Study to Evaluate the Safety and Efficacy of the Oral Pan-RAF Inhibitor DAY101 in Pediatric Patients With BRAF-Altered, Recurrent or Progressive Low-Grade Glioma


Approximately 60 pediatric patients will be treated with DAY101, an oral pan-RAF inhibitor, for a planned period of 26 cycles will be treated with DAY101 for a planned period of 26 cycles (approximately 24 months). DAY101 will be administered at the recommended Phase 2 dose (RP2D) of 420 mg/m2 (not to exceed 600 mg) orally once weekly (QW) for each 28-day treatment cycle. Treatment cycles will repeat every 28 days in the absence of disease progression or unacceptable toxicity. Patients will undergo radiographic evaluation of their disease at the end of every third cycle. Patients will continue on DAY101 until radiographic evidence of disease progression by RANO criteria as determined by treating investigator, unacceptable toxicity, patient withdrawal of consent, or death. Patients who have radiographic evidence of disease progression may be allowed to continue DAY101 if, in the opinion of the investigator and approval by the Sponsor, the patient is deriving clinical benefit from continuing study treatment. Disease assessments for patients being treated beyond progression should continue as per regular schedule. DAY101 is an oral pan-RAF inhibitor administered as an oral tablet at 420 mg/m2 (not to exceed 600 mg).


Low-grade Glioma Glioma DAY101


You can join if…

Open to people ages 6 months to 25 years

  • Age 6 months to 25 years with a relapsed or progressive LGG with known activating BRAF alteration
  • Confirmation of histopathologic diagnosis of LGG and molecular diagnosis of activating BRAF alteration
  • Must have received at least one line of systemic therapy and have evidence of radiographic progression
  • Must have at least 1 measurable lesion as defined by RANO criteria

You CAN'T join if...

  • Patient's tumor has additional previously-known activating molecular alterations
  • Patient has symptoms of clinical progression in the absence of radiographic progression
  • Known or suspected diagnosis of neurofibromatosis type 1 (NF-1)
  • Other inclusion/exclusion criteria as stipulated by protocol may apply


  • UCSF Benioff Children's Hospital accepting new patients
    San Francisco California 94143 United States
  • Doernbecher Children's Hospital Oregon & Health Science University accepting new patients
    Portland Oregon 97239 United States


accepting new patients
Start Date
Completion Date
Day One Biopharmaceuticals, Inc.
Phase 2 Glioma Research Study
Study Type
Expecting 60 study participants
Last Updated