Table 2.

Results of meta-regression analysis exploring source of heterogeneity with progression-free/disease-free and overall survival.

Univariate analysisUnivariate analysis
Detection method0.150.100.15−
Time point of sampling−−
Stage of breast cancer−0.410.120.001−
Sample size−0.0010.0010.250.00030.00060.64
Publication year−−

NOTE: The dependent variable is the lnHR for PFS/DFS or OS from each study. Weights have been assigned according to the estimated variance of the lnHR. SE, standard error of the coefficient.