But the real proof of Papanicolaou’s principle lay in another discovery: astonishingly, 557 women were found to have preinvasive cancers or even precancerous changes—early-stage, localized lesions curable by relatively simple surgical procedures. Nearly all these women were asymptomatic; had they never been tested, they would never have been suspected of harboring preinvasive lesions. Notably, the average age of diagnosis of women with such preinvasive lesions was about twenty years lower than the average age of women with invasive lesions—once again corroborating the long march of
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