Which follow-up method involves using databases and files from other sources?

The method that involves using databases and files from other sources is passive follow-up. In this approach, cancer registries rely on external data sources, such as death certificates, health records, or insurance claims, to track the status of cancer patients. Instead of actively reaching out to patients or healthcare providers for updates, registries gather information that is already available in existing databases.

Passive follow-up is particularly efficient for maintaining up-to-date records without the need for direct patient interaction. This method can also enhance the accuracy and comprehensiveness of the registry by incorporating data from various healthcare and administrative sources, thus providing a broader picture of patient outcomes over time.

By utilizing this approach, cancer registries can ensure they capture vital information pertaining to patients, including those who may have been lost to follow-up through other methods. It serves as a valuable tool in cancer surveillance and research, upholding the standards of data collection while minimizing the direct costs and efforts associated with active follow-up strategies.