Abstract:
IMPORTANCE:Objective response rate (ORR) is an increasingly important end point for accelerated development of highly active anticancer therapies, yet its relationship to regulatory approval is not well characterized. OBJECTIVE:To identify circumstances in which a high ORR is associated with regulatory approval, and therefore might be an appropriate end point for definitive single-arm studies of anticancer therapies. DATA SOURCE:A database of all oncology clinical trials registered at clinicaltrials.gov between October 1, 2007, and September 30, 2010. STUDY SELECTION:Trials of palliative systemic therapies for 4 measurable solid tumor types, limited to those with trial arms of at least 20 patients reporting ORR per Response Evaluation Criteria in Solid Tumors (RECIST). DATA EXTRACTION AND SYNTHESIS:A systematic search was used to identify the reported ORR for each eligible treatment arm that had been presented publicly. MAIN OUTCOMES AND MEASURES:For each treatment regimen, defined as a single-agent or unique combination of agents for 1 cancer type, the mean ORR and the maximum ORR statistically exceeded were calculated, and their association with regulatory approval was studied. A regimen was considered approved for a specific cancer type if it had received regulatory approval in any country for treatment of advanced cancer of that type. RESULTS:From 1800 trials, 874 eligible trial arms in 578 eligible trials were identified; 542 arms had ORR data available for 294 regimens. Maximum ORR and mean ORR were significantly associated with regulatory approval (τ = 0.27, P < .001; τ = 0.12, P = .01); this relationship was stronger for single-agent therapies (τ = 0.49; τ = 0.41) than for combination regimens (τ = 0.28; τ = 0.17). Evaluation of ORR thresholds between 20% and 60% as potential trial end points demonstrated that ORR statistically exceeding 30% with a single agent had 98% specificity and 89% positive predictive value for identifying regimens achieving regulatory approval. CONCLUSIONS AND RELEVANCE:For single-agent regimens, high ORR was associated with regulatory approval; this relationship was less strong for combination regimens. Our data suggest that high ORR (eg, statistically exceeding an ORR of 30%) is an appropriate end point for single-arm trials aiming to demonstrate breakthrough activity of a single-agent anticancer therapy.
journal_name
JAMA Oncoljournal_title
JAMA oncologyauthors
Oxnard GR,Wilcox KH,Gonen M,Polotsky M,Hirsch BR,Schwartz LHdoi
10.1001/jamaoncol.2015.6315subject
Has Abstractpub_date
2016-06-01 00:00:00pages
772-9issue
6eissn
2374-2437issn
2374-2445pii
2492725journal_volume
2pub_type
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