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Burr was in. He enthusiastically sent one of his contraptions back with Langman to his wards, where, in an initial group of 100 women, he strapped one electrode to the lower abdomen above the pubis, and the other either on or alongside the cervix.6 Women whose troubles turned out to be caused by ovarian cysts or other non-cancerous medical issues almost always had a positive reading. Women with malignant tumors, however, showed an electrical “marked negativity” of the cervical region every time.7 Langman confirmed their diagnosis with a pathological examination. Cancerous tissues, it appeared, emitted an unmistakable electrical signature. Langman repeated the technique in about a thousand women to see whether his results stood up. They did: 102 of his patients exhibited the characteristic voltage reversals. When Langman operated on them, he confirmed that 95 of the 102 had cancer.8 Even more remarkably, often the masses had not even progressed to the point where the symptoms would have driven them to visit the doctor, never mind obtain a correct diagnosis. After removing these cancers, the electrical polarity shown on the electrometer would normally flip back to a “healthy” positive indicator—but it did not always. When it stayed negative, Burr and Langman suspected that this indicated that they either hadn’t got it all, or the cells had metastasized. Somewhere in the body, a cancerous mass was still sending its nefarious signals. What struck them as especially strange was that the electrode inside the genital tract did not have to be placed directly on, or even particularly near to, the malignant tissue for the anomaly to be detectable. It was like a distress signal was being sent over distances through the body’s healthy tissue.
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Sally Adee (We Are Electric: Inside the 200-Year Hunt for Our Body's Bioelectric Code, and What the Future Holds)