Secondary gastrointestinal cancer in childhood cancer survivors: a cohort study
- PMID: 22665813
- PMCID: PMC3554254
- DOI: 10.7326/0003-4819-156-11-201206050-00002
Secondary gastrointestinal cancer in childhood cancer survivors: a cohort study
Abstract
Background: Childhood cancer survivors develop gastrointestinal cancer more frequently and at a younger age than the general population, but the risk factors have not been well-characterized.
Objective: To determine the risk and associated risk factors for gastrointestinal subsequent malignant neoplasms (SMNs) in childhood cancer survivors.
Design: Retrospective cohort study.
Setting: The Childhood Cancer Survivor Study, a multicenter study of childhood cancer survivors diagnosed between 1970 and 1986.
Patients: 14 358 survivors of cancer diagnosed when they were younger than 21 years of age who survived for 5 or more years after the initial diagnosis.
Measurements: Standardized incidence ratios (SIRs) for gastrointestinal SMNs were calculated by using age-specific population data. Multivariate Cox regression models identified associations between risk factors and gastrointestinal SMN development.
Results: At median follow-up of 22.8 years (range, 5.5 to 30.2 years), 45 cases of gastrointestinal cancer were identified. The risk for gastrointestinal SMNs was 4.6-fold higher in childhood cancer survivors than in the general population (95% CI, 3.4 to 6.1). The SIR for colorectal cancer was 4.2 (CI, 2.8 to 6.3). The highest risk for gastrointestinal SMNs was associated with abdominal radiation (SIR, 11.2 [CI, 7.6 to 16.4]). However, survivors not exposed to radiation had a significantly increased risk (SIR, 2.4 [CI, 1.4 to 3.9]). In addition to abdominal radiation, high-dose procarbazine (relative risk, 3.2 [CI, 1.1 to 9.4]) and platinum drugs (relative risk, 7.6 [CI, 2.3 to 25.5]) independently increased the risk for gastrointestinal SMNs.
Limitation: This cohort has not yet attained an age at which risk for gastrointestinal cancer is greatest.
Conclusion: Childhood cancer survivors, particularly those exposed to abdominal radiation, are at increased risk for gastrointestinal SMNs. These findings suggest that surveillance of at-risk childhood cancer survivors should begin at a younger age than that recommended for the general population.
Primary funding source: National Cancer Institute.
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Summary for patients in
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Summaries for patients. Increased risk for gastrointestinal cancer in childhood cancer survivors.Ann Intern Med. 2012 Jun 5;156(11):I-36. doi: 10.7326/0003-4819-156-11-201206050-00001. Ann Intern Med. 2012. PMID: 22665822 No abstract available.
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