2010 Study Abstract
We examined long-term risk of cancer in women exposed to diethylstilbestrol (DES) in utero.
A total of 12,091 DES-exposed women in the Netherlands were followed prospectively from December 1992 till June 2008. Cancer incidence was assessed through linkage with the Dutch pathology database (PALGA) and the Netherlands Cancer Registry and compared with the Dutch female population.
A total of 348 medically verified cancers occurred; median age at end of follow-up was 44.0 years. No overall increased risk of cancer was found (standardized incidence ratio [SIR] = 1.01; 95% confidence interval [CI] = 0.91, 1.13). The risk of clear cell adenocarcinoma of the vagina and cervix (CCA) was statistically significantly increased (SIR = 24.23; 95% CI = 8.89, 52.74); the elevated risk persisted above 40 years of age. The risk of melanoma diagnosed before age 40 was increased (SIR = 1.59; 95% CI = 1.08, 2.26). No excess risks were found for other sites, including breast cancer.
The results of our study are generally reassuring except for CCA, with a risk increase persisting at older ages. The slightly elevated risk of melanoma before age 40 is remarkable, but needs to be confirmed by other studies. We did not confirm the increased risk of breast cancer at older ages, as suggested in the NCI DES Follow-up study. Since most DES daughters in our cohort are still relatively young (44.0 years), longer follow-up is warranted to examine cancer risks at ages when cancer occurs more frequently.
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