circRNA_103128, also known as has_circ_0061694, is located on chromosome 21, and its expression level is increased in medulloblastoma tissues; Yin et al. have reported that circRNA-103128 knockdown is associated with increased apoptosis rate, reduced cell viability, migration, invasion, and clonogenicity of medulloblastoma cells, and decreased tumor weight in animal models via the circRNA_103128/miR-129-5p/SOX4 [66]. The gene discussed is SOX4; the disease is medulloblastoma.