Impact of Diagnosis Month on Breast Cancer Survival
Author Information
Author(s): R. Sankila, H. Joensuu, E. Pukkalal, S. Toikkanen
Primary Institution: Finnish Cancer Registry
Hypothesis
Does the month of diagnosis affect survival of cancer patients?
Conclusion
The month of diagnosis is a significant prognostic factor for breast cancer survival, with the highest risk of death in August.
Supporting Evidence
- The risk of death was highest when the diagnosis was made in August.
- The five-year cumulative relative survival rate for breast cancer patients diagnosed in July to September was lower than for those diagnosed in other months.
- Seasonal variations in survival were also observed in colorectal cancer patients.
Takeaway
When women are diagnosed with breast cancer in August, they tend to have a worse chance of surviving compared to those diagnosed in other months.
Methodology
The study analyzed data from the Finnish Cancer Registry for breast and colorectal cancer patients diagnosed between 1956 and 1985.
Potential Biases
Potential biases due to seasonal variations in healthcare availability and patient behavior.
Limitations
The study may not account for all confounding factors affecting survival rates.
Participant Demographics
Female breast cancer patients diagnosed in Finland.
Statistical Information
Confidence Interval
95% CI 0.99-1.21 for August, 95% CI 0.84-1.02 for March
Statistical Significance
p<0.05
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