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Medulloblastoma in childhood: an epidemiological study
Insights
This study analyzed 143 pediatric medulloblastoma cases, noting a potential link to SV40-contaminated polio vaccines and increased family cancer history. Survival rates improved significantly from 1968-1977, especially with chemotherapy.
Area of Science:
- Pediatric Oncology
- Epidemiology
- Neuro-oncology
Background:
- Medulloblastoma is a common pediatric brain tumor.
- Understanding epidemiological trends and risk factors is crucial for improving outcomes.
- Previous studies have explored genetic and environmental factors in medulloblastoma development.
Purpose of the Study:
- To analyze the incidence, clinical characteristics, and survival trends of pediatric medulloblastoma.
- To investigate potential associations with environmental factors like polio vaccine contamination.
- To evaluate the impact of different treatment modalities on patient survival.
Main Methods:
- Retrospective review of 143 pediatric medulloblastoma cases from the Connecticut Tumor Registry (1950-1992).
- Analysis of incidence rates, demographic data, family history, and treatment protocols.
- Survival analysis based on treatment type and time period.
Main Results:
- Incidence showed a slight peak between 1954-1958, with a possible link to SV40-contaminated polio vaccines.
- Increased familial incidence of brain tumors, leukemia, and childhood cancers was observed.
- Survival rates significantly improved from 1968-1977, with chemotherapy showing promising results in a small cohort.
Conclusions:
- Pediatric medulloblastoma incidence may be influenced by environmental factors.
- Family history is a significant risk factor.
- Advances in treatment, including chemotherapy, have improved survival rates for medulloblastoma patients.
Abstract:
The authors have reviewed 143 cases of medulloblastoma in children aged 19 years or younger who were treated in a 42-year period and reported in the Connecticut Tumor Registry. About 20 cases have occurred in each 5-year period since 1950, but 31 were seen between 1955 and 1959. Correspondingly, an excessive number of children born in the period 1954 to 1958 have developed medulloblastomas. A relationship to polio vaccine contaminated with SV40 virus may exist. Children with medulloblastomas had an increased number of immediate family members with brain tumors, leukemia, and childhood cancer when compared to controls. In this series, the male to female ratio was 1.33:1. Average age at diagnosis was 6 1/2 years, with most children being diagnosed at 3 years old and fewer cases appearing in each successive hemidecade from birth to 20 years of age. Probability of survival at 6 months was 0.687; at 1 year, 0.444; at 2 years, 0.314; and at 5 years, 0.222. Survival probability was statistically significantly better in the years 1968 to 1977 than in previous decades, in part due to fewer autopsy diagnoses and lowered operative mortality, but also due to a decreased mortality rate in children several years after diagnosis. Fifty-one percent were treated with operation and irradiation, 17% with operation alone, 12% with irradiation alone, and 5% with operation, irradiation, and chemotherapy. Fifteen percent were not treated. One- and 5-year survival rates in patients with operation and irradiation were, respectively, 0.615 and 0.307; with operation, 0.125 and 0.042; with irradiation, 0.688 and 0.277; and with operation, irradiation, and chemotherapy, 0.857 and 0.643. All seven children who received chemotherapy were diagnosed after 1968, and five are still alive. Perhaps due to short follow-up time, the course and mortality rate of children treated with all three modalities were not statistically significantly different from those of children treated since 1968 with operation and radiation therapy.