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Clinical calculator summary

Graded Prognostic Assessment (GPA) for Brain Metastases

The GPA is a validated prognostic index that estimates survival in patients with brain metastases using four clinical factors, developed from analysis of 1,960 patients in five RTOG trials.

Evidence-based context for fast calculator use

Purpose:
Estimate median survival in brain metastases patients to guide treatment decisions
Population:
Patients with newly diagnosed brain metastases from any primary tumour
Factors:
Age, Karnofsky Performance Status (KPS), Number of brain metastases, Extracranial metastases
Reference:
Sperduto et al., JCO 2008
HomeGPA (Graded Prognostic Assessment)
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GPA (Graded Prognostic Assessment)

Clinical Context & Background

The Graded Prognostic Assessment (GPA) is a prognostic index for patients with brain metastases. It is considered more accurate than the RPA as it is quantitative. Scores range from 0 (Poor) to 4 (Best). Note: This is the original GPA; specific DS-GPA (Diagnosis-Specific) nomograms exist for different primary sites.
Primary Source EvidenceSperduto PW, et al. A new prognostic index and comparison to three other indices for patients with brain metastases: an analysis of 1,960 patients in the RTOG database. Int J Radiat Oncol Biol Phys. 2008;70(2):510-514.
Formula Logic
Sum of scores (0, 0.5, 1.0) for Age, KPS, # of CNS Mets, and Extracranial Mets.

Reference Data

GPA ScoreMedian Survival
0 - 1.02.6 months
1.5 - 2.53.8 months
3.06.9 months
3.5 - 4.011.0 months

Clinical Workflow

Use, Interpret, And Continue The Patient Pathway

Expand for workflow guidance, limitations, examples, and related next steps.

When To Use

  • Use GPA (Graded Prognostic Assessment) when graded Prognostic Assessment estimates median survival in brain metastases patients to guide whole-brain radiotherapy or surgical decisions.
  • Confirm that the patient, diagnosis, disease phase, and available inputs match the cited model before calculation.

How To Interpret

  • Interpret the displayed result using the calculator-specific formula and reference table, spanning 0 - 1.0 through 3.5 - 4.0.
  • A boundary result should prompt input verification and clinical review rather than false precision.

What To Do Next

  • Confirm primary histology, molecular classification, number and location of lesions, extracranial disease, performance status, and treatment era.
  • Document the inputs, result, timing, and clinical context so the assessment can be reproduced.

Limitations

  • Generic brain-metastasis and disease-specific GPA models should not be interchanged.
  • The result supports clinician judgment and does not independently determine treatment.

Validated Population

patients with primary or metastatic central nervous system disease in the setting described by the model

How to apply this result

For a representative case, verify Age, Karnofsky Performance Status, Number of CNS Metastases, calculate the result, and confirm that its classification matches the highlighted reference band before continuing the disease-specific pathway.

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Related Tools

WHO CNS Tumor Grade (2021)RPA (Brain Metastases)Diagnosis-Specific GPA (Brain Mets)

Frequently Asked Questions

When should GPA (Graded Prognostic Assessment) be used?

Use it for patients with primary or metastatic central nervous system disease in the setting described by the model when all required inputs and the intended clinical setting are confirmed.

Can GPA (Graded Prognostic Assessment) determine treatment by itself?

No. Interpret the result with the cited evidence, complete clinical assessment, current guidelines, and patient-specific goals.

Evidence-based oncology decision support. Verify with clinical guidelines.