Related Experiment Videos
Summary: multiple primary cancers in Connecticut, 1935-82.
National Cancer Institute Monograph
|December 1, 1985
Summary
Cancer survivors face a 31% higher risk of developing a second primary cancer, with long-term survivors and females at greater risk. Environmental factors like smoking and alcohol contribute to these increased risks.
Area of Science:
- Oncology
- Cancer Epidemiology
Background:
- Cancer survivors have an increased risk of developing subsequent primary cancers.
- Long-term follow-up data is crucial for understanding cancer survivorship and secondary cancer development.
Purpose of the Study:
- To evaluate the risk of second primary cancer in a large cohort of cancer patients.
- To identify factors influencing second cancer development, including time since first diagnosis, sex, and potential environmental exposures.
Main Methods:
- Analysis of over 250,000 cancer cases from the Connecticut Tumor Registry (CTR) spanning 1935-1982.
- Longitudinal follow-up exceeding 1 million person-years to assess second cancer incidence.
- Comparison of cancer patient risk with the general Connecticut population.
Main Results:
- Cancer patients had a 31% overall increased risk of a second primary cancer compared to the general population.
- Females exhibited a higher risk (41%) than males (18%), particularly after 20 years of follow-up.
- Environmental factors, including smoking and alcohol, were linked to increased risks for specific second cancers (e.g., lung, larynx, esophagus).
Conclusions:
- Cancer survivors face a significantly elevated risk of developing new primary cancers.
- Long-term survivors, especially females, are at the highest risk for second cancers.
- Environmental exposures and potential hormonal/dietary factors play a role in secondary cancer development, necessitating continued surveillance and research.