Gastric Freezing — Froze 15,000 Stomachs, Then a Sham Freeze Worked Just as Well

In May 1962, University of Minnesota surgical chairman Owen H. Wangensteen announced in JAMA that a duodenal ulcer could be cured without an operation by swallowing a balloon and chilling the stomach to roughly minus-10 degrees Celsius — a bloodless “physiological gastrectomy” — and within two years thousands of Americans had been frozen on refrigeration machines that had never passed a single controlled trial; the gap between that announcement and the 1969 finding that a fake freeze worked exactly as well is the entire case. Gastric freezing was not a fringe quackery. It was launched by one of the most decorated academic surgeons in the United States, published in the country’s leading medical journal, and adopted at scale before anyone tested it against a placebo.

The promise rested on a plausible mechanism and a flattering measure. Wangensteen reasoned that supercooling the gastric mucosa would knock out the acid-secreting cells that drove ulcer disease, achieving by cold what surgeons then achieved by cutting out half the stomach. Early uncontrolled series were spectacular: investigators reported that on the order of 85 percent of patients had prompt relief of pain and apparent healing of ulcer craters. That surrogate — short-term symptom relief, the most placebo-responsive endpoint in all of medicine — was mistaken for cure. The acid suppression was real but transient, returning to baseline within weeks to months, and the symptom relief was, it later emerged, almost entirely the patient’s own expectation.

The reckoning came from the design that the launch had skipped. By 1964 controlled and double-blind studies were appearing, and in July 1969 a multi-institution cooperative trial led by Julian Ruffin reported in the New England Journal of Medicine that patients given a genuine gastric freeze did no better than patients given a sham freeze in which the same balloon circulated fluid that was never chilled. The treatment effect, against a proper control, was zero. Gastric freezing collapsed almost as fast as it had spread. It was never banned and never recalled; it was abandoned — and it survives in textbooks as the canonical demonstration of why a new procedure must be tested against a sham before, not after, it is sold to thousands.