Women with prenatal diethylstilbestrol exposure are excluded from less frequent cervical cancer screening because of their increased neoplasia risk. We report the results of a prospective follow-up study of prenatal diethylstilbestrol exposure and lower genital tract high-grade (grade 2 or higher) squamous intraepithelial lesions (HSIL). The age-adjusted risk of HSIL among diethylstilbestrol-exposed women (n=4,062) was higher than among the diethylstilbestrol unexposed (n=1,837) through age 44 years (hazard ratio 2.03, 95% CI, 1.31–3.14) but not age 45 years or older. Elevated HSIL risk remained higher in diethylstilbestrol-exposed women, after accounting for frequency of cervical cancer screening. Compared with unexposed women, HSIL risk was higher among women with earlier gestational and high-dose diethylstilbestrol exposure. These data confirm the appropriateness of more frequent screening among diethylstilbestrol-exposed women through age 44 years. Whether those aged 45 years or older should continue to have increased screening will require careful weighing of possible risks and benefits.
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