关键词：美国；临床研究；肿瘤学临床研究；乳腺癌临床研究
摘 要：The US is the most developed and active market across the globe in the area of clinical research. As of June '2013,69,659 clinical studies have been registered in the country. The state of California contributes the maximum to a number of clinical studies registered in the country with 18,808 clinical studies as of June,2013. A leader in medical innovation and researches, the US currently faces substantial challenges hampering the effective and efficient conduct of clinical research in the country. The clinical research scenario in the country is neither satisfying the current health care needs of the society nor is observing pace with the changes in the organization of health care system.
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