Kattan/Zelefsky 2003

5-Year Metastasis Risk After Definitive 3D-CRT

Tier A — Exact Public Engine

Citation: Kattan MW, Zelefsky MJ, Kupelian PA, et al. Pretreatment nomogram that predicts 5-year probability of metastasis following three-dimensional conformal radiation therapy for localized prostate cancer. J Clin Oncol. 2003;21(24):4568–4571.

Source: Cleveland Clinic RiskCalc (github.com/ClevelandClinicQHS/riskcalc-website) — Exact public engine reproduction.

Endpoint: 5-year probability of metastasis after 3D-CRT.

Training cohort: MSKCC definitive RT cohort (3D-CRT era).

Note: This calculator includes restricted cubic spline transformations for log(PSA), Gleason sum, and age, exactly as published.

Pretreatment Parameters

Pre-treatment PSA (ng/mL) Range: 0.1–50

Clinical T Stage T1A and T1B excluded from model

Biopsy Gleason Score Primary + Secondary grade

Primary Grade

Secondary Grade

Gleason Sum: —

Age (years) Range: 40–90

Disclaimer: This calculator is for educational and research purposes only. Results do not constitute medical advice. Always consult with a qualified radiation oncologist for clinical decision-making. Model coefficients are exact reproductions from published literature and the Cleveland Clinic RiskCalc repository.