Cancer Risk in Relatives of Retinoblastoma Patients
Author Information
Author(s): B.M. Sanders, M. Jay, G.J. Draper, E.M. Roberts
Primary Institution: Childhood Cancer Research Group, Department of Paediatrics, University of Oxford
Hypothesis
Is there an increased risk of non-ocular cancer in relatives of retinoblastoma patients?
Conclusion
Relatives of retinoblastoma patients, especially known carriers of the retinoblastoma gene, have a significantly higher risk of developing non-ocular cancers.
Supporting Evidence
- Among 117 relatives who were known carriers of the mutation, 23 cases of non-ocular cancer developed compared to an expected 2.3.
- Carrier relatives have a relative risk of 9.9 for developing non-ocular cancer.
- 21 out of 25 deaths among carriers were due to non-ocular cancer, compared to an expected 1.8.
Takeaway
If your family has someone with retinoblastoma, you might have a higher chance of getting other types of cancer, especially if you carry the same gene.
Methodology
The study followed up 1,438 parents and 2,663 relatives of retinoblastoma patients to assess cancer incidence and mortality.
Potential Biases
Possible under-reporting of events and misclassification of causes of death.
Limitations
There may have been under-reporting of cancer cases and deaths, particularly among paternal relatives.
Participant Demographics
Included parents, grandparents, aunts, and uncles of retinoblastoma patients, with a focus on those likely to be carriers of the retinoblastoma gene.
Statistical Information
Confidence Interval
95% confidence limits for relative risk of 6.3 to 14.9 for cancer incidence among carriers.
Statistical Significance
p<0.05
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