About Us

The National Cancer Institute’s (NCI) National Clinical Trials Network (NCTN) was established from NCI's longstanding Cooperative Group program. The network conducts large-scale, national, oncology treatment and advanced imaging clinical trials in an era of precision medicine. 

NCI’s goal is to make data from phase III, phase II/III, and select phase II NCTN and NCI Community Oncology Research Program (NCORP) trials available in a timely manner, on appropriate terms and conditions, to researchers who wish to analyze the data in secondary studies to enhance the public health benefit of the original work.

Prior to May 2, 2025, these data were accessible through the NCTN/NCORP Data Archive website. Beginning in Q3 of 2025, requests for NCTN and NCORP data will transition to the database of Genotypes and Phenotypes (dbGaP). Depending on the NCTN/NCORP trial, researchers may also find other types of data (e.g., imaging, genomic, etc.) in dbGaP. Data previously available in the Archive will be released in dbGaP on a rolling basis, with future NCTN and NCORP trial datasets to follow.

With some exceptions, the NCTN and NCORP data that will be made available in dbGaP include clinical data from:

• Primary publications of phase 3 trials published as of January 1, 2015 and
• Select non-primary publications of phase 3 trials published as of April 1, 2018

Note: Data are not available immediately upon publication.

NCTN and NCORP data will include clinical datasets, a data dictionary, and limited metadata fields. Datasets are patient-level, de-identified, and include data for all variables used in the analyses presented in each corresponding publication (with minor exceptions). Data can be used to approximate published study findings, but exact replication of previous manuscripts may not be possible in some cases (e.g., when data must be modified for de-identification purposes).

Researchers seeking access to NCTN and/or NCORP data should request access through the dbGaP platform.

A current listing of available datasets, including links to dbGaP accession numbers, is available here: NCTN/NCORP Archive Data in dbGaP

Please check back regularly for updates as additional trial data become available.

Last Updated: September 05, 2025