Table 2. Pooled hazard ratios for overall survival and recurrence-free survival.

Pooled analysis	Study number	HR (95% CI)	P for difference	P for heterogeneity and I-squared
Overall Survival
All groups	15	0.853 (0.741-0.981)	0.026	0.001 and 61.3%
In colorectal cancer	5	0.653 (0.430-0.991)	0.045	0.038 and 60.6%
In prostate cancer	3	1.194 (0.735-1.941)	0.474	0.085 and 59.5%
Recurrence-free Survival
All groups	19	0.846 (0.718-0.998)	0.047	0.000 and 71.4%
In prostate cancer	7	0.919 (0.765-1.104)	0.366	0.127 and 39.7%
In ovarian cancer	3	0.640 (0.396-1.033)	0.068	0.133 and 50.4%