Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Hazard ratio for disease-free survival of HER2-low breast cancers versus HER2-zero breast cancers in the overall population (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 < 0.001; Egger’s test: P = 0.212.
