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Hazard ratio (HR) for overall survival of HER2-low breast cancers versus HER2-zero breast cancers in the overall population in the metastatic setting (the size of the squares is proportional to the weight of each study).
CI, confidence interval; HER2, human epidermal growth factor receptor 2. Random effect: P = 0.008; Egger’s test: P = 0.540.
