Caisis is an open source web application designed to bridge the gap between Clinical Research and Clinical Practice. The application was originally designed to track data for Urologic cancer, but now has expanded to track other cancers. The Caisis project was initiated with the goal of improving data quality and accuracy while reducing time and effort for clinicians and support staff. The Caisis team has openly embraced the open source model. As such, the application and all of its source code is freely available for download under the General Public License (GPL), an open source license approved by the Open Source Initiative.

In most instances, Caisis is currently being used to help manage patient data. For example, Caisis is in use at Memorial Sloan-Kettering Cancer Center, New York, to support clinical practice and documentation for every patient who comes through the Urology and Genitourinary Medicine clinics. There are about 45,000 patients currently in the database here. The system is also used to help follow these patients longitudinally to determine their long-term outcomes.

The New York Prostate Institute is the first group to take Caisis in a new and different direction in their Haliard project. The Haliard project expands on the functionality of Caisis by incorporating features that are unique to Radiation Oncology, including brachytherapy seed inventory and management module. While Haliard expands on the feature set in Caisis, it was progressed in less time and with less effort because the base fields, features, and functions were already available through the Caisis source code.

The goal of CAISIS is the development of an open source system that integrates research and clinical practice. Current work is focusing on the development of electronic forms ("eForms") for physicians