Screening mammography in the elderly: a case-control study

Area of Science:

• Oncology
• Radiology
• Public Health

Background:

• Screening mammography is recommended for early breast cancer detection.
• Participation rates in screening mammography among the elderly population are not well understood.
• Metastatic breast cancer in elderly women may be linked to screening disparities.

Purpose of the Study:

• To investigate the hypothesis that elderly women with metastatic breast cancer were less likely to have undergone prior screening mammography compared to controls.
• To assess the association between screening mammography and the risk of developing metastatic breast cancer in women over 60.
• To highlight potential gaps in adherence to screening mammography guidelines for the elderly population.

Main Methods:

• A case-control study design was employed.
• Cases comprised women over 60 with metastatic breast cancer; controls were selected from a tumor registry.
• Mammogram records were reviewed and categorized as 'diagnostic,' 'screening,' or 'indeterminant' by blinded reviewers.

Main Results:

• A significant finding was that less than 6% of control participants had ever received a screening mammogram.
• Odds ratios suggested a potential beneficial effect of screening (OR=0.73 for ever screened; OR=0.71 if screened within the year of diagnosis).
• Confidence intervals for these associations included one, indicating limited statistical power due to low screening participation.

Conclusions:

• The study underscores a significant underutilization of screening mammography among elderly women.
• There is a major implication that elderly individuals are not adequately included in current mammography screening programs, despite existing recommendations.
• Further research and interventions are needed to improve screening participation in this demographic to potentially reduce rates of metastatic breast cancer.