一美国国家癌症咨询委员会（NCAB）以17∶1票数，通过了向美国国家癌症研究所（NCI）推荐乳房X线照相的建议，他们认为如果40岁—49岁妇女在患乳腺癌风险的平均水平，应劝其每1－2年进行乳房X线普直。对50岁或50岁以上的妇女，咨询委员会认为NCI应建议其每1－2年进行乳房X线检 A National Cancer Advisory Board (NCAB) passed a recommendation to the National Cancer Institute (NCI) for mammography with a 17:1 vote. They believe that women aged 40 to 49 years are at average risk for breast cancer. At the level, it is advised that the mammography should be performed every 1-2 years. For women 50 years of age or older, the Advisory Committee believes that NCI should recommend that they perform mammography every 1-2 years