Failure of Further Validation for Survival Nomograms in Oropharyngeal Cancer: Issues and Challenges

To retrospectively test 2 nomograms recently validated as prognostic tools for patients with oropharyngeal cancer treated with curative radiation-based therapy, in 184 consecutive subjects treated from April 2004 to January 2016.Complete information regarding disease, survival status, and nomogram covariates was retrieved for 174 patients, with a median follow-up of 51 months. Calibration of the nomograms was obtained by evaluating the ability...