如同大多数疫苗一样，任何筛选试验的程序都不是百分之一百的有效。举例来说，有一小部分妇女的癌前期病变细胞在筛选试验中显示假阴性而逃过了检测。
As with any screening test, and most vaccines, the process is not 100 percent effective, and a small number of women with precancerous cells escape detection with false negative tests, for example.
除此以外，还有至少100，000名有其他癌前期状态的妇女也经常被用同样的模式进行治疗。
S. At least an additional 100,000 women have other precancerous conditions that often are treated in the same way.
Sachs认为对于有癌前期病变的病人，这一发现可以促使他们更好的完成治疗。
Sachs said for patients with precancerous spots, the findings may be an added inducement to finish treatment.
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