Hepatic Cancer Risk in Children Conceived via Frozen Donor Egg
Based on the most recent and highest-quality evidence, children conceived through frozen-thawed embryo transfer (FET), including those from donor eggs, appear to have a modestly increased risk of hepatic tumors compared to naturally conceived children, though the absolute risk remains very low.
Evidence for Increased Hepatic Cancer Risk
The strongest and most recent evidence comes from a 2025 meta-analysis 1 that specifically examined malignancy risks in ART-conceived offspring. This study found that children born after ART had an increased risk of hepatic tumors (OR 2.10) compared to natural pregnancy. This finding is particularly relevant to your question about frozen donor eggs.
Further supporting this concern, a 2022 Nordic cohort study 2 of nearly 8 million children found that children born after FET had a 65% higher risk of cancer overall (aHR 1.65,95% CI 1.24-2.19) compared to spontaneous conception, with specific increases noted in epithelial tumors and leukemia. The incidence rate was 30.1 per 100,000 person-years for FET children versus 16.7 per 100,000 for naturally conceived children.
Important Context and Caveats
The absolute risk remains extremely low. Even with a doubled relative risk, hepatic tumors in children are rare events. The 2025 meta-analysis 1 found that ART overall did not increase the risk of total malignancy (OR 1.04), suggesting the hepatic tumor finding represents a specific concern rather than a generalized cancer risk.
The mechanism may relate to epigenetic alterations during cryopreservation. A 2026 review 3 explains that freezing and thawing embryos occurs during critical periods of epigenetic programming, potentially affecting DNA methylation patterns, particularly at imprinted genes. This is supported by epidemiological evidence showing increased rates of imprinting disorders (Beckwith-Wiedemann syndrome, which itself carries a 2,280-fold increased risk of hepatoblastoma 4) in FET-conceived children.
Clinical Implications
No routine screening is currently recommended for hepatic cancers in children conceived via FET with donor eggs, as the absolute risk remains low and general pediatric screening guidelines 5 state that "there are no current data to support general screening for HCC in children" except in specific high-risk conditions (tyrosinemia, bile salt excretory pump disease).
However, clinicians should:
- Maintain heightened awareness of hepatic tumor symptoms in these children
- Promptly evaluate any concerning signs (abdominal mass, unexplained hepatomegaly, elevated alpha-fetoprotein on routine testing)
- Consider the conception method as a risk modifier when evaluating hepatic abnormalities
- Counsel parents that while a modest increased risk exists, the absolute probability of hepatic cancer remains very low
Strength of Evidence and Limitations
The evidence quality is moderate. The 2025 meta-analysis 1 provides the most comprehensive assessment but acknowledges that results are based on relatively small numbers of cancer cases in the FET subgroup. The 2022 Nordic study 2 had only 48 cancer cases in the FET group, limiting statistical power for specific cancer types. A 2023 Dutch review 6 appropriately notes that "results must be replicated in other large cohort studies before translation into clinical practice."
The biological plausibility is strong given the known sensitivity of epigenetic programming during embryo development 3, but the exact mechanisms remain incompletely understood.
In summary: Yes, there appears to be a modestly increased risk of hepatic cancers in children conceived via frozen-thawed embryo transfer (including donor egg scenarios), but the absolute risk remains low and does not currently warrant routine screening protocols beyond standard pediatric care with heightened clinical awareness.