Here, we investigate the role of the LIN28B pathway in G3 MB and demonstrate that the LIN28B–lethal‐7 (let‐7; a microRNA that is a tumor suppressor)–lymphokine‐activated killer T‐cell‐originated protein kinase (PBK; also known as PDZ‐binding kinase) axis promotes G3 MB proliferation. The gene discussed is PBK; the disease is neoplasm.