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. 2023 Feb 21;12(8):9133–9143. doi: 10.1002/cam4.5652

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© 2023 The Authors. Cancer Medicine published by John Wiley & Sons Ltd.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Investigator‐assessed progression‐free survival by number of prior cytotoxic chemotherapies and investigator‐assessed progression‐free survival by histologic subtype of tumor. Kaplan–Meier plots for subgroup analysis of investigator‐assessed progression‐free survival (A) and overall survival (B) in the intention‐to‐treat (ITT) population. Stratification factors for overall survival were the number of prior cytotoxic chemotherapy regimens (1 or ≧2), tumor histology (squamous or nonsquamous). CI, confidence interval; HR, hazard ratio.