Consistent with the policies of the National Institutes of Health, COG considers requests from investigators who are not members of COG and to make its research data available to them. Investigators who wish to use individual patient data from one or more COG studies must make a formal request to the Group. The formal request must be in the form of a brief proposal as outlined below. The Group will then review the scientific merits and feasibility of the request.

Note: Requests for data will ordinarily be considered once the primary study analyses have been published. Nevertheless, consideration of requests for data will be entertained in the event that there are long delays in the publication of the primary study data.

The following information must be provided for requests for data from completed COG protocol research. The proposal must be no more the 5 pages. Proposals longer than 5 pages will be returned un-reviewed.
1) Title of research proposal
2) Project principal investigator(s), and contact information: address, phone number, e-mail address
3) COG protocol(s) from which project data is being requested
4) Project primary and secondary objectives
5) Description of the project’s importance: what is to be learned from the research proposed to be performed using the data requested?
6) Description of the data elements requested and how these data will be used to address the primary and secondary objectives of the research
7) Brief description of how the project will be conducted
8) Description of funding plan for the project to include time and effort allocations for the Study Development Office and Statistics & Data Center
9) List of cases that are to be included in the dataset (e.g., list the study numbers), including what data items are required and descriptions of any exclusion restrictions

Requests for access to COG protocol research data should be sent to: This email address is being protected from spambots. You need JavaScript enabled to view it.

The Group will conduct an internal review of the merit and feasibility of the proposal, including whether there are sufficient data to provide adequate information for analysis and if the required data are available. Investigators will be notified of the Group’s decisions in writing within 6 weeks of receipt. If a request is denied, COG, in the written decision, will provide the reasons the request was denied and inform the investigators that a denied request may be appealed as outlined in the appeals process section below. Release of the data is subject to the conditions outlined in release conditions below.


Release of data for research purposes is subject to the following conditions. A formal Data Use Agreement (DUA) covering the relevant conditions will usually be required.

For all data sharing with investigators who are not members of COG, a project-specific identifier which is not the patient’s COG identifier will be provided which identifies the research subject. The COG Statistics & Data Center will maintain the record of the patient’s COG identifier and the project-specific identifier.


If a request for data is denied, the applicant may appeal the decision. The appeal will be reviewed by the COG Group Chair, NCI/CTEP’s program officer and an outside statistician (i.e., a statistician that does not work for COG). The outside statistician will be named jointly by the COG Group Chair and the NCI/CTEP program officer.

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