Cancer-derived lactic acid as a potential upstream contributor to tumor hypoxia.

Cancer-derived lactic acid may act as an upstream contributor to tumor hypoxia, forming a feedback loop that sustains hypoxic tumor regions.

• Why it matters: Understanding the drivers of tumor hypoxia is crucial because hypoxia promotes tumor progression, abnormal blood vessel formation, immune suppression, and resistance to therapy.
• What they did: The authors review evidence that lactic acid accumulates independently of oxygen levels due to oncogenic signaling and mitochondrial dysfunction, and propose it may promote hypoxia and related signaling in tumors.
• The result: This framework suggests targeting lactic acid production or transport could disrupt the self-reinforcing cycle, offering a potential therapeutic strategy to mitigate hypoxia-driven tumor progression.