The Warburg effect, observed in most solid tumors, refers to the preference for aerobic glycolysis over oxidative phosphorylation even in adequate oxygen. The PRIMARY advantage conferred to tumor cells by this metabolic reprogramming is:

• A Maximizing ATP yield per glucose molecule consumed
• B Reducing reactive oxygen species that would otherwise trigger apoptosis via the mitochondrial pathway
• C Generating biosynthetic precursors (nucleotides, amino acids, lipids) via glycolytic intermediates for anabolic growth ✓
• D Upregulating NADPH oxidase to promote oxidative DNA damage in competing stromal cells

Explanation

Although aerobic glycolysis produces far less ATP per glucose than oxidative phosphorylation, it provides rapid generation of glycolytic intermediates that feed into biosynthetic pathways — pentose phosphate pathway for nucleotide synthesis, serine/glycine biosynthesis, acetyl-CoA for fatty acid and cholesterol synthesis — all required for rapid cell growth and division. Rapidly dividing tumor cells are not energy-starved but building-block-starved; the Warburg effect solves that problem. Reduced ROS from mitochondria is a secondary benefit, not the primary metabolic logic.

Reference: Robbins & Cotran Pathologic Basis of Disease, 10th ed.

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Written and medically reviewed by the StethoPrep medical team.