• Edward Chow, Mohamed Abdolell, Tony Panzarella, Kristin Harris, Andrea Bezjak, Padraig Warde, and Ian Tannock.
• Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, ON, Canada. Edward.Chow@sunnybrook.ca
• Int. J. Radiat. Oncol. Biol. Phys. 2009 Mar 15; 73 (4): 1169-76.

PurposeTo construct a predictive model for survival of patients referred to the Rapid Response Radiotherapy Program using recursive partitioning (RP).Methods And MaterialsWe analyzed 16 factors characterizing patients with metastases at first referral to the Rapid Response Radiotherapy Program for palliative radiotherapy in 1999 for their effect on survival. They included age, primary cancer site, site of metastases, weight loss (>or=10% during the past 6 months), Karnofsky performance status (KPS), interval from the first diagnosis of cancer to the first consultation at the Rapid Response Radiotherapy Program, analgesic consumption within the previous 24 h, and the nine symptom scores from the Edmonton Symptom Assessment Scale. We used RP to develop a predictive model of survival for patients referred in 1999, followed by temporal validation using patients referred in 2000, and external validation using patients referred in 2002 to another institution.ResultsThe model was able to separate patients into three groups with different durations of survival that were defined by (1) KPS >60; (2) KPS ConclusionWe have demonstrated that RP can be used to predict the survival of patients with advanced cancer. However, this model has no advantages compared with our published prognostic models that use the survival prediction scores and number of risk factors.

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