Flora E. van Leeuwen

STUDY QUESTION: What is the risk of endometrial cancer after long-term follow-up in women treated with ART between 1983 and 2001 compared with women in the general population and subfertile women who did not undergo ART? SUMMARY ANSWER: Th…

Study questionDo children, adolescents, and young adults born after ART, including IVF, ICSI and frozen-thawed embryo transfer (FET), have an increased risk of cancer compared with children born to subfertile couples not conceived by ART an…

BackgroundLong-term effects of assisted reproductive technology (ART) on ovarian tumor risk are unknown.MethodsThis nationwide cohort study comprises 30 625 women who received ovarian stimulation for ART in 1983-2000 and 9988 subfertile wom…

STUDY QUESTION: Is ovarian or extra-ovarian endometriosis associated with an increased risk of ovarian cancer and borderline ovarian tumours (BOT)? SUMMARY ANSWER: We found a 3- to 8-fold increased risk of ovarian tumours associated with en…

The authors assessed the accuracy of cause(s) of subfertility as reported by women in a self-administered questionnaire in comparison with medical record information, in a nationwide cohort study of women receiving in vitro fertilization tr…