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Defeating Tumors With Sound Waves

PhD student Zhen Xu was testing high-frequency sound waves on pig hearts in the early 2000s when annoyed lab mates complained about the noise, prompting her to increase the pulse rate to bring it outside human hearing range, and to her shock, the faster microsecond pulses were not only quieter but far more effective, creating a hole in tissue within a minute. Her serendipitous discovery, known as histotripsy, was approved by the FDA for liver tumors in October 2023 and is now ushering in a new era of advanced cancer treatment that uses ultrasound to mechanically break up tumors without surgery, achieving technical success against 95 percent of liver tumors in a small study. The treatment channels ultrasound waves into a focal zone about two by four millimeters creating tiny microbubbles that expand and collapse in microseconds, breaking apart tumor tissue so the immune system can clean up the remains, usually allowing patients to go home the same day with procedures lasting one to three hours.

Beyond histotripsy, researchers are combining ultrasound with other cancer treatments in promising ways, including injecting microbubbles into the bloodstream and stimulating them with ultrasound to temporarily open the blood-brain barrier and allow drugs to reach tumors, or pairing ultrasound with immunotherapy to make cancerous tissues more visible to the immune system. High-Intensity Focused Ultrasound, an older established technology that essentially cooks tissue with heat, is roughly as effective as surgery for prostate cancer with faster recovery times, though both approaches have limitations as bone or gas can block sound waves from reaching certain tumors. The UK became the first European country to approve histotripsy in June 2025, making it available on the NHS and marking a shift toward replacing or improving devastating therapies like surgery, chemotherapy, and radiation with non-invasive sound-based approaches. Xu, now a professor at the University of Michigan, says ultrasound isn’t a magic cure but hopes her discovery will help patients avoid unnecessary suffering for years to come, proving that sometimes the most groundbreaking medical advances happen when researchers try to stop annoying their colleagues.

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