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Background

Metastatic bone patients who require surgery needs to be evaluated in order to maximise quality of life and avoiding functional impairment, minimising the risks connected to the surgical procedures. The best surgical procedure needs to be tailored on survival estimation. There are no current available tool or method to evaluate survival estimation with accuracy in patients with bone metastasis. We recently developed a clinical decision support tool, capable of estimating the likelihood of survival at 3 and 12 months following surgery for patients with operable skeletal metastases. After making it publicly available on www.PATHFx.org, we attempted to externally validate it using independent, international data.

Methods

We collected data from patients treated at 13 Italian orthopaedic oncology referral centers between 2008 and 2012, then applied to PATHFx, which generated a probability of survival at three and 12-months for each patient. We assessed accuracy using the area under the receiver-operating characteristic curve (AUC), clinical utility using Decision Curve Analysis DCA), and compared the Italian patient data to the training set (United States) and first external validation set (Scandinavia).