The metabolism of cancer cells is reprogrammed toward aerobic glycolysis (the Warburg effect), which stimulates tumor growth. Phosphofructokinase (PFK) and its isoforms, PFKP, PFKM, and PFKL, are highly conserved central glycolytic controllers and a potential therapeutic intervention. This review discusses the complex functions of PFK in tumor biology, including its roles in regulating proliferation, invasion, metastasis, and therapy resistance. It further discusses the tumor microenvironmental