A total of 711 patients were selected from the GSE2034 and E-MTAB-365 datasets to observe the mRNA expression levels of TOR1B among BM BC patients. Based on mRNA expression levels, the Kaplan‒Meier method was used to compare the survival between BC patients who developed BM and those who did not develop BM in total as well as those with ER- and PR-positive BC. Chi-square and log-rank tests were used to assess patient survival and metastasis.
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