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The flow chart and the screening of BCBM related variables. (A) The flow chart. There are 16,972 patients included in this study based on the inclusion and exclusion criteria. (B and C) LASSO regression is used to screen variables. (D) Forest plots are used to delineate the independent risk factors of BCBM.
Abbreviations: API, Asian, Pacific Islander; ER, estrogen receptor.
