What question did this study set out to answer?

To assess the geographic variation in the use of breast-conserving surgery for localized breast cancer in the U.S.

Geographic Variation in the Treatment of Localized Breast Cancer

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Cross-sectional evaluation of treatment variations in localized breast cancer, indicating significant geographic differences in surgical approaches.

To assess the geographic variation in the use of breast-conserving surgery for localized breast cancer in the U.S.
Analyzed data from 18,399 non-Hispanic white, 324 Hispanic, and 1174 black women with breast cancer.
Examined trends from 1983 to 1986 across nine U.S. areas using the Surveillance, Epidemiology, and End-Results Program.
Breast-conserving surgery rates among white women ranged from 9.2% in Iowa to 32.1% in Seattle in 1983-1984.
The proportion of women receiving radiation therapy post-surgery varied by geography, with increases noted from 1983 to 1986.
Older women and black women in certain areas were less likely to receive radiation therapy after breast-conserving surgery.

Farrow et al. (1992) studied this question.

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Cross-sectional evaluation of treatment variations in localized breast cancer, indicating significant geographic differences in surgical approaches.