• This editorial expression of concern alerts readers to potential authorship irregularities in a previously published article on CAR-T cell therapy for multiple myeloma.
• The substantial authorship change during revision did not match the extent of the revision, raising concerns about the integrity of the publication process.
• Several authors did not agree with the expression of concern, while others did not respond, highlighting unresolved authorship disputes.
• The original article remains available, but readers are cautioned about the reliability of its authorship and content.