Tam 2011.

Methods	Identification of subsequent full‐length publications Searched electronic database MEDLINE, PubMed, and Embase from January 1989 to December 2009 Person completing the search not reported Searched by first, second, and last author, and keywords Matching criteria not reported Contacted abstract authors directly
Data	Included 709 abstracts presented at the 1989 to 2003 American Society of Clinical Oncology meetings Included all abstracts of phase III or randomized controlled trials with sample size >= 200 and outcome of overall survival, disease‐free survival, or progression‐free survival Excluded abstracts that were "repeat presentations" (n = 8) or were published >= 3 months before presentation (n = 2)
Comparisons	Proportion of abstracts published Median time to publication Survival analysis of publication rate
Outcomes	643 of 709 abstracts published Proportion of abstracts published by time Median time to publication = 31.2 months Survival analysis of proportion published at 120 month = 88.5% No factors related to proportion of abstracts published reported
Notes	Oncology Funding not reported
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all abstracts that described RCTs and Phase III trials.
Search for publications?	Yes	Searched 2 databases and contacted abstract authors.
Follow‐up time?	Yes	All meetings had at least 6 years follow‐up.
Matching?	Unclear	Matching criteria not reported.