Study Design
FIREFLY-1 Study Design
OJEMDA: Studied in FIREFLY-1, the largest clinical trial to date in children with BRAF-altered R/R pLGG1,2
137 patients received OJEMDA in the pivotal FIREFLY-1 trial conducted in collaboration with the Pacific Pediatric Neuro-Oncology Consortium3
FIREFLY-1 is a global, multicenter, open-label, single-arm clinical trial.3
Key inclusion criteria3
- 6 months to 25 years old
- BRAF-altered R/R pLGG
- At least 1 prior systemic therapy with documented radiographic progression
Key exclusion criteria4
- Known or suspected diagnosis of NF1
Patients received OJEMDA ≈420 mg/m2 orally once weekly (range: 290 mg/m2 to 476 mg/m2, 0.76-1.25 times the approved recommended dosage) according to BSA with a maximum dosage of 600 mg until disease progression or unacceptable toxicity.1
Patients who had radiographic disease progression were permitted to continue on treatment with OJEMDA at the investigator’s discretion.5
- Arm 1: Primary efficacy analysis (n=76)*
- Arm 1 + Arm 2: Primary safety analysis (n=137)†
Trial endpoints1,5
Major efficacy outcome1‡
- ORR (RAPNO-LGG criteria)§
Select secondary outcomes1
- Time to response
- Duration of response
Safety outcome5
- Safety and tolerability
- *77 patients were enrolled in Arm 1; 76 patients were considered evaluable for response by RAPNO-LGG criteria.1
- †Arm 2 is an extension arm, which provided treatment access for patients with BRAF-altered pLGG after the registrational arm closure.5
- ‡The primary endpoint was the ORR according to RANO-HGG criteria.5
- §ORR was defined as the proportion of patients with CR, PR, or MR by independent review based on RAPNO-LGG criteria.1
2-year Update
Patients from the efficacy arm have completed 2 years of treatment with OJEMDA in FIREFLY-15
- The trial includes a 2-year treatment period (26 cycles of treatment) and a 3-year posttreatment observation period
- Patients from both arms of the trial entered the 3-year posttreatment observation period after completing 26 cycles of treatment
Treatment exposure duration
- The median duration of the OJEMDA primary treatment exposure in the efficacy arm was 24 months (range: 0.7 to 32.5 months) based on the May 10, 2024 data cutoff5
In FIREFLY-1, OJEMDA delivered clinically meaningful tumor shrinkage1
See the results
Baseline Characteristics
Baseline characteristics from FIREFLY-1, reflective of patients seen in clinical practice7
OJEMDA was studied in a population where almost half of patients received 1 or 2 prior lines of therapy3
Baseline characteristics (N=76)1,3
| Age (years) |
|---|
Median (range) 8.5 (2-21) |
| Sex |
Male 53% |
Female 47% |
| BRAF alterations |
BRAF fusion 74% |
V600E mutation 16% |
Other (including BRAF duplication or rearrangement) 11% |
| Number of prior systemic regimens |
|---|
Median (range) 3 (1-9) |
1 22% |
2 27% |
≥3 51% |
| Prior MAPK-targeted therapy |
No 41% |
Yes 59% |
Common tumor locations1
Cerebral hemisphere
0%
Optic pathway
0%
Cerebellum
0%
Brain
stem
0%
Deep midline structures
0%
BRAF=v-Raf murine sarcoma viral oncogene homolog B1; BSA=body surface area; CR=complete response; FDA=Food and Drug Administration; MAPK=mitogen-activated protein kinase; MR=minor response; NF1=neurofibromatosis type 1; ORR=overall response rate; pLGG=pediatric low-grade glioma; PR=partial response; RAF=rapidly accelerated fibrosarcoma; RANO-HGG=Response Assessment in Neuro-Oncology for High-Grade Glioma; RAPNO-LGG=Response Assessment in Pediatric Neuro-Oncology for Low-Grade Glioma; R/R=relapsed/refractory.