Correction to Add Description of and Citation to Related Articles and Complete Description of Study Methods

In the Original Investigation titled “Association of O⁶-Methylguanine-DNA Methyltransferase Protein Expression With Postoperative Prognosis and Adjuvant Chemotherapeutic Benefits Among Patients With Stage II or III Gastric Cancer,”¹ the authors had failed to provide citations to and description of the previously published and related 9 studies; a more complete explanation of the role of Shanghai Outdo Biotech Co, Ltd, in creating the tissue microarrays and evaluating the immunohistochemistry scores; and a better explanation of the rationale for use of R software, version 3.3.2, in the Abstract, Introduction, Methods, and eMethods 1 and eMethods 2 in the Supplement. These omissions did not affect the conclusions of the article. A Letter of Explanation² has been published that details the source of these errors. This article has been corrected online.