Clinical calculator summary
2021 WHO CNS5 Grade Interpreter
Clinical calculator summary
2021 WHO CNS5 Grade Interpreter
This route is a strict identity interpreter for a CNS WHO grade already assigned by a pathologist under the WHO Classification of Tumours fifth edition, Central Nervous System Tumours volume (WHO CNS5, 2021).
Evidence-based context for fast calculator use
- Purpose:
- Interprets an explicitly pathologist-assigned CNS WHO grade from an integrated WHO CNS5 (2021) neuropathology report without deriving the grade.
- Population:
- patients with primary or metastatic central nervous system disease in the setting described by the model
- Factors:
- Pathologist-assigned CNS WHO grade
2021 WHO CNS5 Grade Interpreter
Clinical Context & Background
Identity lookup: pathologist-assigned CNS WHO grade n -> CNS WHO grade n, for n in {1, 2, 3, 4}.Reference Data
| Submitted value | WHO CNS5 interpreter output |
|---|---|
| 1 | CNS WHO grade 1 |
| 2 | CNS WHO grade 2 |
| 3 | CNS WHO grade 3 |
| 4 | CNS WHO grade 4 |
Clinical Workflow
Use, Interpret, And Continue The Patient Pathway
Expand for workflow guidance, limitations, examples, and related next steps.
Clinical Workflow
Use, Interpret, And Continue The Patient Pathway
Expand for workflow guidance, limitations, examples, and related next steps.
When To Use
- Use 2021 WHO CNS5 Grade Interpreter when interprets an explicitly pathologist-assigned CNS WHO grade from an integrated WHO CNS5 (2021) neuropathology report without deriving the grade.
- 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 1 through 4.
- 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 Pathologist-assigned CNS WHO grade, calculate the result, and confirm that its classification matches the highlighted reference band before continuing the disease-specific pathway.
Calculation verification history
Verified
Calculation verification history
Verified: Production browser revalidation
- Three source-backed WHO CNS5 identity cases passed through visible production controls for grades 1, 2, and 4.
- No unexpected N/A, literal undefined value, stale control, unsupported risk gauge, or browser-console error was observed.
Case-level evidence is retained in validation/browser-revalidation/who-cns-2026-08-03.json.
: Local browser remediation
- All WHO CNS grade-interpreter outcomes now explicitly suppress the shared generic risk gauge so grade is not misrepresented as stage or universal prognosis.
- Ten source-backed cases passed through visible local browser controls across 11 submissions, covering all four grades, repeated submissions, required-field validation, and reset/repeat behavior.
- The existing calculator-specific audit passed 112/112. Production status remains open until this commit is deployed and the public route is revalidated.
Local case-level remediation evidence is retained in validation/browser-production/who-cns.local-remediation.json.
: Production browser validation
- Ten source-backed cases were exercised on the public production route through visible browser controls; 1/10 case records passed their expected-versus-observed assertions across 11 visible submissions.
- Overall browser status: failed-ui-and-console. high: Every valid CNS grade identity result displayed a Low Risk / Intermediate / High Risk gauge even though this route explicitly states that grade is not stage and does not provide universal prognosis. | medium: Production emitted minified React error #418 during route loads/reloads used by this run.
- Case-level inputs, expected and observed results, reset/repeat behavior, failure reproductions, and console evidence are retained in the production-browser evidence record.
Case-level production evidence is retained in validation/browser-production/who-cns.json.
: Full validation test
- 112/112 engine, UI, equality, malformed-input, source, scope, trace, registry, history, report, and evidence assertions passed.
- This is source-to-code implementation verification, not independent clinical validation.
: Correction
- Reframed the route as a strict interpreter of a pathologist-assigned CNS WHO grade.
- Removed defaults, coercion, obsolete cross-tumor prognosis and treatment claims, unsupported-value fallthrough, and grade derivation implications.
Verification confirms the calculator implementation against the cited model; it is not independent clinical validation, regulatory approval, or medical advice.
Related Tools
Frequently Asked Questions
When should 2021 WHO CNS5 Grade Interpreter 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 2021 WHO CNS5 Grade Interpreter 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.