The Stephenson nomogram, which predicts the outcome of salvage radiation, has been revalidated: http://www.ncbi.nlm.nih.gov/pubmed/19466946 .
The electronic version, a calculator, can be found here:
http://www.mskcc.org/applications/nomograms/prostate/SalvageRadiationTherapy.aspx
The updated paper version of the nomogram is here, but I find the digital version much easier.
The upshot of the validation is that the nomogram is a good rough guide to probability of success. It's better at the two ends of the risk spectrum (high and low) than it is for men in the middle, however.
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