There was a decreasing trend in the standardized incidence ratio for ovarian cancer among patients' sisters by increasing age of the index patient.
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Long-term risk of cancer among the first-degree relatives of epithelial ovarian cancer patients: A cohort study with 48 years of follow up.
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The sentences
The SIR was 0.47 for the mothers and 1.54 for the daughters, but these did not reach statistical significance.