FDA analysis of patient enrollment by region in clinical trials for approved oncological indications

2539 Background: Clinical trials are increasingly conducted on a global scale in an effort to accelerate accrual. This analysis attempts to quantify and characterize participants in trials submitted to support approval of drugs for oncology indications by the region of enrollment. Methods: Demographic information was extracted for patients enrolled in clinical trials submitted to the FDA from 2005-2015. Only trials submitted to support approval for malignant solid tumor or hematology indications were included. Countries were grouped into regions for further analysis. A total of 178,024 patients with information regarding age and country were included in this analysis. Results: Forty five percent (80,460) of clinical trial participants were enrolled from Europe, 36% (63,958) from North America (includes U.S.A and Canada) and 8.4% (14,975) from Asia. Countries in Latin America, Middle East/Africa and the Baltic States/Russia enrolled the remainder 10.5% of the patients. Among 99,556 participants < 65 years of age; 38.7% (38,538) were enrolled from North America, 40.5% (40,362) from Europe, 9.7 % (9674) from Asia and 11% from the rest of the regions. Europe enrolled the highest number of cancer patients aged 65 years or older; 51.1% (40,098) compared to 32.4% (25,420) from North America and 6.8 % (5301) from Asia. Conclusions: Majority of patients enrolled into clinical trials submitted for oncology drug approvals were from regions other than North America, with highest number enrolled from Europe particularly in the older age group. While it is interesting to speculate, the reasons for differential enrollment of patients between Europe and North America and the impact of these findings on interpretation of clinical trial results need additional exploration. Analysis of trends over time may be useful to address this issue. [Table: see text]