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.
真的假的？难道搜索引擎让他得癌了？
小细胞癌常无明显的大核仁（而恶性黑色素瘤常有），偶尔伴有核内假包涵体。
Small cell carcinomas usually do not show large prominent nucleoli, whereas melanomas often do, accompanied by occasional intranuclear pseudoinclusions.
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