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Tumour size distribution in mammography screening.
S H Njor1, A H Olsen, W Schwartz
1Institute of Public Health, University of Copenhagen, Blegdamsvej 3, DK-2200 Copenhagen N, Denmark. s.njor@pubhealth.ku.dk
Breast (Edinburgh, Scotland)
|August 9, 2005
Summary
Mammography screening programs struggle to detect smaller invasive breast cancers over time. Analyzing tumor size distribution reveals that the number of screening rounds, not just point estimates, impacts detection rates of small tumors.
Area of Science:
- Oncology
- Radiology
- Public Health
Background:
- Mammography screening programs aim to detect breast cancer early, particularly small invasive cancers.
- A key goal of screening is to increase the detection of small invasive tumors at subsequent screens compared to initial screens.
- Many programs have not demonstrated this improvement, raising concerns about screening effectiveness.
Purpose of the Study:
- To evaluate breast cancer tumor size distribution in a mammography screening program.
- To determine if screening programs effectively increase the detection of small invasive breast cancers.
- To assess the impact of screening frequency on tumor size distribution.
Main Methods:
- Analysis of mammography screening data from Fyn County, Denmark.
- Evaluation of tumor size distribution, considering both point estimates and the entire distribution.
- Statistical analysis to identify factors influencing tumor size distribution, including the number of screens.
Main Results:
- The mammography screening program altered the detection of tumors larger than 10 mm (specifically, those <15 mm or <20 mm).
- However, the program did not significantly change the detection rate of tumors smaller than 10 mm.
- The number of screening rounds was identified as the sole significant factor affecting the tumor size distribution.
Conclusions:
- Relying solely on point estimates may inaccurately reflect a screening program's ability to detect small invasive cancers.
- The entire tumor size distribution provides a more comprehensive evaluation of screening effectiveness.
- Screening program evaluations should incorporate the analysis of the complete tumor size distribution to better understand early cancer detection capabilities.