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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">OL</journal-id>
<journal-title-group>
<journal-title>Oncology Letters</journal-title>
</journal-title-group>
<issn pub-type="ppub">1792-1074</issn>
<issn pub-type="epub">1792-1082</issn>
<publisher>
<publisher-name>D.A. Spandidos</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3892/ol.2021.13061</article-id>
<article-id pub-id-type="publisher-id">OL-0-0-13061</article-id>
<article-categories>
<subj-group>
<subject>Retraction</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>Oncolytic virotherapy with human telomerase reverse transcriptase promoter regulation enhances cytotoxic effects against gastric cancer</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author"><name><surname>Kato</surname><given-names>Tomoya</given-names></name></contrib>
<contrib contrib-type="author"><name><surname>Nakamori</surname><given-names>Mikihito</given-names></name></contrib>
<contrib contrib-type="author"><name><surname>Matsumura</surname><given-names>Shuichi</given-names></name></contrib>
<contrib contrib-type="author"><name><surname>Nakamura</surname><given-names>Masaki</given-names></name></contrib>
<contrib contrib-type="author"><name><surname>Ojima</surname><given-names>Toshiyasu</given-names></name></contrib>
<contrib contrib-type="author"><name><surname>Fukuhara</surname><given-names>Hiroshi</given-names></name></contrib>
<contrib contrib-type="author"><name><surname>Ino</surname><given-names>Yasushi</given-names></name></contrib>
<contrib contrib-type="author"><name><surname>Todo</surname><given-names>Tomoki</given-names></name></contrib>
<contrib contrib-type="author"><name><surname>Yamaue</surname><given-names>Hiroki</given-names></name></contrib>
</contrib-group>
<pub-date pub-type="ppub">
<month>11</month>
<year>2021</year></pub-date>
<pub-date pub-type="epub">
<day>22</day>
<month>09</month>
<year>2021</year></pub-date>
<volume>22</volume>
<issue>5</issue>
<elocation-id>800</elocation-id>
<permissions>
<copyright-statement>Copyright: &#x00A9; Kato et al.</copyright-statement>
<copyright-year>2021</copyright-year>
<license license-type="open-access">
<license-p>This is an open access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License</ext-link>, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.</license-p></license>
</permissions>
</article-meta>
</front>
<body>
<p>Oncol Lett 21: Article no. <related-article xmlns:xlink="http://www.w3.org/1999/xlink" related-article-type="retracted-article" vol="21" page="490" id="RA1" xlink:href="10.3892/ol.2021.12751" ext-link-type="doi">490</related-article>, 2021; DOI: 10.3892/ol.2021.12751</p>
<p>Following the publication of the above paper, the authors have requested that the article be retracted for the following reasons. First, a retraction was requested since a material transfer agreement (MTA) between the University of Tokyo and Wakayama Medical University had been violated upon submission of the article for publication. Secondly, the article had been submitted for publication without having received the final agreement of all the individual coauthors (in particular, the three coauthors HF, YI and TT) by prior written consent. Thirdly, the authors are uncertain that the results presented in Fig. 4B are fully reproducible, and therefore there is an element of uncertainty regarding the integrity of some of the data.</p>
<p>The Editor of <italic>Oncology Letters</italic> has agree to the authors&#x2019; request that this paper be retracted from the Journal. The Editor apologizes to the readership for any inconvenience caused.</p>
</body>
</article>
