In utero exposure to didanosine was associated with increased risk of brain cancer in a French study. We used United States health department records to assess cancer risk among 13 617 children exposed to HIV in utero , who remained HIV-uninfected after birth (1990-2017). Risk of brain tumors was borderline elevated among these children (standardized incidence ratio 2.2, 95% confidence interval 0.8-4.8, P = 0.12, based on six cases). Risk was not significantly increased for leukemia or other cancers.
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