Freeman 2012.

Methods	Identification of subsequent full‐length publications Searched electronic database PubMed to 2010 Person completing the search not reported Searched by all authors, cancer types, investigational agent, dose range, and schedule Matched abstract to full‐length publication by All Authors Cancer types Investigational agent Dose range Schedule Contacted abstract authors directly
Data	Included 90 abstracts presented at the 2004 to 2005 American Association for Cancer Research and 1995 to 2005 American Society of Clinical Oncology meetings Included all abstracts describing acquisition of biopsies for research purposes
Comparisons	Proportion of abstracts published Mean time to publication by meeting
Outcomes	70 of 90 abstracts published 22/26 abstracts presented at the 2004 to 2005 American Association for Cancer Research and 48/64 at the 1995 to 2005 American Society of Clinical Oncology meeting published Proportion of abstracts published by time Mean time to publication = 22.8 months for the American Association for Cancer Research meetings Mean time to publication = 34.8 months for the American Society of Clinical Oncology meetings No factors other than meeting year related to proportion of abstracts published reported
Notes	Oncology Government funding received and costs of publication of article defrayed in part by the payment of page charges
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all abstracts of a specific topic.
Search for publications?	Yes	Searched 1 database and contacted abstract authors directly.
Follow‐up time?	Yes	All meetings had at least 60 months follow‐up.
Matching?	Yes	Matched by 5 different criteria.
Adjustment for confounding?	No	Examined association of meeting with publication using stratified analysis.