The October 10, 2018, article by ten Broeke et al entitled "Cancer Risks for PMS2-Associated Lynch Syndrome" (J Clin Oncol 10.1200/JCO.2018.78.4777) was published with an error. Liselotte van Hest should have been included in the author list, between Heather Hampel and John Hopper. The following should have appeared in the list of affiliations: "Liselotte van Hest, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands." Under AUTHOR CONTRIBUTIONS, Liselotte van Hest should have been included in the section entitled Collection and assembly of data. In the section AUTHORS' DISCLOSURES OF POTENTIAL CONFLICTS OF INTEREST, the following should have appeared: "Liselotte van Hest No relationship to disclose." This has been corrected as of February 18, 2019. The authors apologize for the error.