An abnormal Pap test could indicate a precancerous condition that can be treated.

一个异常的巴氏检查可能表明了一种可以治疗的癌前期病变。

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Taking medicines to treat a precancerous condition or to keep cancer from starting.

使用药物治疗癌前病变或预防癌症。

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At the study start, 31 had the precancerous condition known as mild dysplasia and five had moderate dysplasia.

在研究开始前，31人有轻度不典型增生性癌前病变，5人有中度不典型增生性癌前病变。

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ALA-based compounds are approved in the U.S. as a treatment for actinic keratosis, a precancerous skin condition, but not for acne.

WSJ: As More Adults Get Acne, New Photodynmic Treatments Use Light