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In vitro fertilization in Sweden: child morbidity including cancer risk
Bengt Källén1, Orvar Finnström, Karl-Gösta Nygren
1Tornblad Institute, University of Lund, Lund, Sweden. embryol@embryol.lu.se
Insights
Children conceived via in vitro fertilization (IVF) experience higher long-term morbidity, particularly related to preterm births and certain diagnoses. Cancer risk was not generally increased, though histiocytosis cases were noted.
Area of Science:
- Reproductive Medicine
- Pediatric Health
- Epidemiology
Background:
- In vitro fertilization (IVF) is a common assisted reproductive technology.
- Understanding the long-term health outcomes for children born after IVF is crucial.
Purpose of the Study:
- To investigate long-term morbidity in children conceived through IVF compared to naturally conceived infants.
- To identify specific health conditions and risk factors associated with IVF conception.
Main Methods:
- A Swedish national register study comparing over 16,000 IVF children with a control group of all infants born.
- Data analyzed included hospital care duration, specific diagnoses, and childhood cancer incidence.
Main Results:
- IVF children showed increased hospital care use up to age six, partly due to maternal factors.
- Diagnoses related to brain damage and other conditions were overrepresented, often linked to preterm births.
- While overall cancer risk was not elevated, an unexpected number of Langerhan's histiocytosis cases were observed.
Conclusions:
- Long-term morbidity is higher in IVF children, influenced by preterm and multiple births.
- Parental factors may also play a role in healthcare utilization.
- No general cancer risk increase was found, but a notable increase in histiocytosis warrants further investigation.
Objective:
To study long-term morbidity among children conceived by IVF.
Design:
A register study in Sweden of IVF infants compared with all infants born.
Setting:
National health registers.
Patient(S):
More than 16,000 children born after IVF (30% of them after intracytoplasmic sperm injection) were studied with national health registers.
Main Outcome Measure(S):
Total number of days in hospital care at different ages, hospitalization for specific diagnoses, childhood cancer.
Result(S):
An overuse of hospital care was found among IVF children up to 6 years of age, which was partly explained by maternal characteristics. Discharge diagnoses indicating brain damage (mental retardation, cerebral palsy, epilepsy, behavioral problems) occurred in excess and seemed to be completely explained by preterm births. In addition, other discharge diagnoses were overrepresented, some of them linked to preterm birth. There were 29 children with cancer (21 expected); 5 of them had Langerhan's histiocytosis.
Conclusion(S):
Long-term morbidity among children conceived by IVF is higher than among naturally conceived infants. This was partly explained by an excess of preterm and multiple births but might also mirror different parental attitudes toward medical care for their children. No general increase in cancer risk was seen, but unexpectedly many children with histiocytosis were noted.
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