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. 2019 Oct 11;107(2):369–377. doi: 10.1002/cpt.1586

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© 2019 The Authors. Clinical Pharmacology & Therapeutics published by Wiley Periodicals, Inc. on behalf of American Society for Clinical Pharmacology and Therapeutics.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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External control patient attrition. aNSCLC, advanced non‐small cell lung cancer; EC, external control; ECOG, Eastern Cooperative Oncology Group; EHR, electronic health record.