Firefox, a protein encoded by circular PVT1, is essential for MYC-driven oncogenesis.

Firefox, a protein encoded by circular PVT1, is crucial for MYC-driven cancer growth, with its depletion reducing tumor progression in models.

• Why it matters: MYC-driven cancers are highly aggressive and often fatal, yet targeting MYC directly remains challenging, highlighting the need to identify key effectors within this pathway.
• What they did: The study identified a circular RNA, CircPVT1, derived from PVT1, which encodes the protein Firefox (FFX); researchers used genomic analysis, molecular biology, and in vivo models to investigate its role.
• The result: Depleting FFX significantly lowers MYC protein levels and tumor growth, revealing FFX as a promising therapeutic target to disrupt the oncogenic circuit in MYC-positive cancers.