In Reply We thank Sabik and Bradley for raising these important points about our study.1 The lack of information on timing of and change in health insurance coverage is a limitation inherent to cancer registry data and, as discussed, has the potential to result in misclassification of patient insurance status. However, we reaffirm that the impact of any such misclassification on our results is likely to be minimal and would not alter the study’s conclusions.
Ellis L, Lichtensztajn D, Gomez SL. Understanding the Limitations of Cancer Registry Insurance Data—Implications for Policy—Reply. JAMA Oncol. 2018;4(10):1433–1434. doi:10.1001/jamaoncol.2018.2460
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