From congress abstract to full article
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A congress abstract is a short summary written for a meeting. A journal article is a full, peer-reviewed report that others can build on. Many good papers start as abstracts, and the main rule is to be open about the link between the two.
What changes between an abstract and an article
The ICMJE recommends that original research follows the IMRAD structure (Introduction, Methods, Results, Discussion) and that the abstract matches the main text. An abstract has no room for that detail, so the article must add it:
A full methods section: setting, participants, measurements, statistical analysis and ethics approval.
Complete results with effect sizes and tables or figures, not only headline numbers.
A discussion that places your findings in the literature and states the limitations.
A reference list. Check the target journal's instructions for article type, structure and length.
Follow the reporting guideline that fits your design. The ICMJE page names CONSORT for randomized trials, STROBE for observational studies, PRISMA for systematic reviews and meta-analyses, and STARD for diagnostic accuracy studies, and recommends the EQUATOR Network as a source.
Updating data and authors
Data: if more patients or a longer follow-up have accrued since the abstract, analyse the complete set and report the final numbers. Do not keep numbers that you have since found to be wrong; explain differences to the editor.
Authors: the ICMJE lists four criteria for authorship: substantial contribution to the work, drafting or critically revising it, approving the final version, and accepting accountability for it. Everyone named should meet all four, and everyone who meets all four should be named. Check the abstract's author list against these criteria; people who only supervised, funded or provided technical help belong in the acknowledgments, with their written permission.
Decide authorship and order among yourselves, in writing, before submission. Journal editors do not settle these disputes; the ICMJE says the authors decide, and the institution investigates when they cannot agree.
Declaring the earlier presentation
According to the ICMJE, a preliminary report such as an abstract, a letter or a poster does not prevent a journal from considering a full report later. Papers presented at a meeting but not published in full, or submitted to proceedings, may also be considered. WAME likewise says that presenting an abstract at a meeting does not bar later submission, but the presentation should be disclosed.
Practical steps:
Name the meeting, date and place in your cover letter, and say whether the abstract was published in an abstract book or supplement.
Attach or link the abstract so the editor can see what has been shared.
If the full paper contains the same results, state that the abstract was a preliminary report.
Follow the target journal's own policy; some ask for the presentation to be mentioned in the manuscript as well. Check the instructions for authors.
The ICMJE also asks authors to report any substantial overlap with published, submitted or accepted work, and to mention preprints.
Student clubs: from poster to paper
Student society posters often describe small projects. If you want to turn one into an article, start by finding a faculty mentor who can supervise, check ethics approval, and help you reach the authorship criteria above. Decide who will write which section, and be honest that a poster is a preliminary form. A case report or a short research letter may be a more realistic first article than a full original study. Be careful with journals that promise fast acceptance; see the guide on choosing a trusted journal.