The NLST design & process, protocol documents, and results are described (link below) in the Cancer Data Access System (CDAS) maintained by Information Management System (IMS), contracted by the National Cancer Institute (NCI) as keepers and statistical analyzers of the NLST trial data.
While NLST design, protocols, and results are well-described and publicly available, access to trial data and images is restricted to NLST investigators with an NCI-approved research plan. NLST investigators with a proposed research plan must register for a CDAS account and petition for data and images through a formal CDAS procedure provided by IMS. See links below for general CDAS information, for requesting login-in credentials, for logging-in, and for IMS/CDAS contact information: