Fig. 4From: Surrogacy of intermediate endpoints for overall survival in randomized controlled trials of first-line treatment for advanced soft tissue sarcoma in the pre- and post-pazopanib era: a meta-analytic evaluationCorrelation of RR with OS. Correlation in (a) all RCTs, (b) RCTs published before 2012 (1974–2012), and (c) RCTs published after 2012 (2013–2017). Abbreviations: HR hazard ratio, OR odds ratio, OS overall survival, RCT randomized controlled trial, RR response rateBack to article page