The sudden increase marked the start of mammography screening in the U. s. in sufficient Numbers that it affected national statistics.

发病的突然增加预示着在美国开始使用钼靶进行大规模的筛查，筛查结果将对全国的统计数据产生较大的影响。

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One of the study authors, Dr. Howard Zellen, a noted cancer clinical trial researcher, said he still recommends mammography screening.

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Last month, the American College of Obstetricians and Gynecologists (ACOG) issued new breast cancer screening guidelines, recommending that mammography screening be offered annually to women beginning at age 40.

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Researchers say increased breast density impairs the accuracy of screening mammography and is a strong, if not the strongest, risk factor for missing cancer.

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