<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE article PUBLIC "-//NLM//DTD Journal Publishing DTD v2.0 20040830//EN" "journalpublishing.dtd"><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" dtd-version="2.0" xml:lang="en" article-type="retraction"><front><journal-meta><journal-id journal-id-type="nlm-ta">JMIR Cancer</journal-id><journal-id journal-id-type="publisher-id">cancer</journal-id><journal-id journal-id-type="index">21</journal-id><journal-title>JMIR Cancer</journal-title><abbrev-journal-title>JMIR Cancer</abbrev-journal-title><issn pub-type="epub">2369-1999</issn><publisher><publisher-name>JMIR Publications</publisher-name><publisher-loc>Toronto, Canada</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">v11i1e82724</article-id><article-id pub-id-type="doi">10.2196/82724</article-id><article-categories><subj-group subj-group-type="heading"><subject>Retraction</subject></subj-group></article-categories><title-group><article-title>Retraction: &#x201C;Designing Positive Psychology Interventions for Social Media: Cross-Sectional Web-Based Experiment With Young Adults With Cancer&#x201D;</article-title></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><collab>JMIR Editorial Office</collab><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff id="aff1"><institution>JMIR Publications</institution><addr-line>130 Queens Quay E, Suite 1100</addr-line><addr-line>Toronto</addr-line><addr-line>ON</addr-line><country>Canada</country></aff><contrib-group><contrib contrib-type="editor"><name name-style="western"><surname>Office</surname><given-names>JMIR Editorial</given-names></name></contrib></contrib-group><author-notes><corresp>Correspondence to JMIR Editorial Office, JMIR Publications, 130 Queens Quay E, Suite 1100, Toronto, ON, M5A 0P6, Canada, 1 416 583 2040; <email>ed-support@jmir.org</email></corresp></author-notes><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>5</day><month>9</month><year>2025</year></pub-date><volume>11</volume><elocation-id>e82724</elocation-id><history><date date-type="received"><day>20</day><month>08</month><year>2025</year></date><date date-type="accepted"><day>20</day><month>08</month><year>2025</year></date></history><copyright-statement>&#x00A9; JMIR Editorial Office. Originally published in JMIR Cancer (<ext-link ext-link-type="uri" xlink:href="https://cancer.jmir.org">https://cancer.jmir.org</ext-link>), 5.9.2025. </copyright-statement><copyright-year>2025</copyright-year><license license-type="open-access" xlink:href="https://creativecommons.org/licenses/by/4.0/"><p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="https://creativecommons.org/licenses/by/4.0/">https://creativecommons.org/licenses/by/4.0/</ext-link>), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Cancer, is properly cited. The complete bibliographic information, a link to the original publication on <ext-link ext-link-type="uri" xlink:href="https://cancer.jmir.org/">https://cancer.jmir.org/</ext-link>, as well as this copyright and license information must be included.</p></license><self-uri xlink:type="simple" xlink:href="https://cancer.jmir.org/2025/1/e82724"/><related-article related-article-type="retracted article" ext-link-type="doi" xlink:href="10.2196/48627" xlink:title="Retraction of" xlink:type="simple">https://cancer.jmir.org/2024/1/e48627</related-article><abstract/></article-meta></front><body><p>Following a request by the authors, the JMIR Publications Editorial Office is retracting the article &#x201C;Designing Positive Psychology Interventions for Social Media: Cross-Sectional Web-Based Experiment With Young Adults With Cancer&#x201D; by Lazard et al [<xref ref-type="bibr" rid="ref1">1</xref>] due to concerns regarding the integrity and reliability of the survey data collected by an external contractor, which underpinned this article. As a result, the JMIR Publications Editorial Office, the editor in chief of the journal, and the authors have lost confidence in the results and conclusions of the published article.</p><sec id="s2"><title>Author Statement</title><p>Lazard et al [<xref ref-type="bibr" rid="ref1">1</xref>] used an external contractor for data collection in December 2021. In June 2025, the authors became aware of legal concerns about alleged fraudulent practices by the external contractor used to collect the survey data the article wholly relied on. The authors can no longer confidently verify how these data were collected nor confirm their legitimacy. Consequently, the authors believe that retraction of the article is the most responsible course to maintain the integrity of the scientific record due to a loss of confidence in the findings.</p><p>All authors agreed with the retraction of the article.</p></sec></body><back><ref-list><title>References</title><ref id="ref1"><label>1</label><nlm-citation citation-type="journal"><person-group person-group-type="author"><name name-style="western"><surname>Lazard</surname><given-names>AJ</given-names> </name><name name-style="western"><surname>Vereen</surname><given-names>RN</given-names> </name><name name-style="western"><surname>Zhou</surname><given-names>J</given-names> </name><etal/></person-group><article-title>Designing positive psychology interventions for social media: cross-sectional web-based experiment with young adults with cancer</article-title><source>JMIR Cancer</source><year>2024</year><month>12</month><day>20</day><volume>10</volume><fpage>e48627</fpage><pub-id pub-id-type="doi">10.2196/48627</pub-id><pub-id pub-id-type="medline">39705529</pub-id></nlm-citation></ref></ref-list></back></article>