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• W2169152145 abstract "The wish to have a biologic child is rooted deeply in human evolution. Although our drive to reproduce is moderated by conscious attitudes and emotions, we are programmed to mate, just like other mammals. It is not surprising that young men and women who survive cancer still want children, especially if they were childless at diagnosis. Parents of children and teenagers diagnosed with cancer are also concerned about potential treatment-related infertility and endorse fertility preservation, as long as it does not delay cancer treatment or remove so much gonadal tissue that recovery of natural fertility might be compromised. Although many cancer survivors have exaggerated worries that children will have birth defects linked to the parent’s cancer treatment or will have a heightened lifetime risk of cancer, few want to give up having children. Other populations exposed to environmental or genetic risk react in a similar way. In a long-term study of 2,345 women exposed to atomic bomb radiation in Hiroshima and Nagasaki, only 10 said they avoided getting pregnant out of fear of having unhealthy children. Their fecundity was comparable to that of unexposed Japanese women. When in vitro fertilization (IVF) using intracytoplasmic injection of one sperm into an oocyte became available to treat severe male infertility, couples who could previously become parents only through adoption or donor insemination could have a biologic child. Despite being informed that their sons or grandsons might inherit genetically linked male infertility, those who could afford the costs of IVF preferred that option, an observation confirmed by a subsequent survey of subfertile men with known Y-chromosome microdeletions. Couples’ choices about giving up childbearing or terminating a pregnancy to avoid a risk to a child’s health depend on the perceived severity of the condition and the degree to which the child’s quality of life will be affected. In our surveys of young adult cancer survivors, less than 10% of men and women would choose adoption or gamete donation to have a child because of concerns about the health of their biologic offspring. Women concerned about inherited cancer report they would be more likely to consider preimplantation genetic diagnosis (ie, creating embryos through IVF and discarding those harboring a known mutation), than to conceive a pregnancy and plan elective termination of an affected fetus. Familial adenomatous polyposis (FAP) is a hereditary cancer syndrome in which colon polyps proliferate and typically become malignant in late adolescence or young adulthood. Almost all men and women with FAP in a recent survey desired prenatal testing in planning future pregnancies. In contrast, only 36% of women affected by hereditary breast and ovarian cancer said they intended to use preimplantation genetic diagnosis in a future conception. Of course, inherited breast and ovarian cancer has a later age of onset and less complete penetrance than FAP. The psychosocial literature confirms the strong desire to have children after cancer and the distress that infertility brings. Thus, biologic limitations on fertility are probably the major cause of decreased birth rates in young cancer survivors. Until now, estimates of birth rates after cancer have been based on relatively small samples of patients who had a specific type of malignancy or fertility-sparing treatment. The notable exceptions are recent publications from the Childhood Cancer Survivor Study, from analysis of a large Finnish cohort of patients diagnosed from childhood to young adulthood, and from a previous analysis of a subset of the same registry data used by Cvancarovaet al. The Childhood Cancer Survivor Study pediatric cancer survivors were diagnosed between 1970 and 1986, corresponding to the earlier patient cases in the study by Cvancarova et al. Among 1,915 female survivors, those currently age 15 to 30 years were significantly less likely to have live births compared with their sisters, with relative ratios ranging from 0.64 to 0.74. Similarly, 1,227 male survivors of cancer fathered significantly fewer live-born infants than their 1,139 brothers (relative risk 0.77). Exposure to pelvic irradiation was associated with higher rates of miscarriage and low birth weight infants in women, but for men, no type of cancer treatment had a clear negative impact. The previous report based on patients treated at one tertiary referral center in Norway only included 463 male and 284 female cancer survivors and did not distinguish between children conceived before, compared with after, cancer treatment. When data for children born to cancer survivors were compared with data for the general Norwegian population born in the same period (1945 to 1982), no discrepancy in rates of children fathered was observed in men, but only 66% of women with cancer became parents, compared with 79% of controls. Cvancarova et al used the same registries, but they had detailed information on 6,071 patients diagnosed between age 15 and 44 years and treated from 1971 to 1997, each matched in age to five controls drawn from the Norwegian birth registry. Their estimate of a 50% reduction in postcancer births for women and 30% for men is somewhat more severe than that in other studies, but also probably more accurate. It is important to have long-term follow-up because of the risk of premature ovarian failure in young women, which may not be apparent in the years just after cancer treatment. Estimates of postcancer fecundity from Cvancarova et al agree well with another recent analysis based on 25,784 cancer survivors and 44,811 siblings from Finland’s cancer and birth registries. The Finnish cohort included patients diagnosed in childhood, adolescence, and JOURNAL OF CLINICAL ONCOLOGY E D I T O R I A L VOLUME 27 NUMBER 3 JANUARY 2" @default.
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• W2169152145 date "2009-01-20" @default.
• W2169152145 modified "2023-10-06" @default.
• W2169152145 title "Rates of Postcancer Parenthood" @default.
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• W2169152145 doi "https://doi.org/10.1200/jco.2008.19.7749" @default.
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