Clinical calculator summary
NCI Breast Cancer Risk Assessment Tool (BCRAT v4.1)
Clinical calculator summary
NCI Breast Cancer Risk Assessment Tool (BCRAT v4.1)
A competing-risk model for absolute invasive breast cancer probability.
Evidence-based context for fast calculator use
- Purpose:
- Provides patient and same-age/race comparison estimates for five years and through age 90.
- Population:
- US women aged 35-85 who meet the NCI eligibility conditions.
- Factors:
- Age, Race/ethnicity, Benign breast biopsies and atypia, Menarche, First live birth, First-degree family history
- Reference:
- NCI BCRAT v4.1 source package (December 2017).
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NCI BCRAT (Gail Model)
Clinical Context & Background
The NCI Breast Cancer Risk Assessment Tool (BCRAT), also called the Gail Model, estimates absolute invasive breast cancer risk over the next five years and through age 90. This implementation follows the NCI BCRAT v4.1 source package, including race-specific relative-risk coefficients, attributable-risk adjustments, breast-cancer incidence, and competing mortality.
The public model is intended for US women aged 35 to 85 without previous invasive breast cancer, DCIS, LCIS, chest radiation for Hodgkin lymphoma, or a known BRCA1/2 or other hereditary breast-cancer syndrome. NCI reports validation for White, Black/African American, Hispanic, and Asian/Pacific Islander women. Estimates may be low for Black women with previous biopsies and Hispanic women born outside the United States; American Indian/Alaska Native and unknown-race estimates use the limited NCI Other model.
Formula Logic
Annual competing-risk integration: breast hazard = incidence(age) x (1 - attributable risk) x relative risk; total hazard adds competing mortality. Absolute risk is the sum of annual breast-cancer contributions from current age to 5 years and to age 90.Reference Data
| Output | Meaning |
|---|---|
| Patient 5-year risk | Estimated absolute invasive breast cancer risk over the next 5 years |
| Patient risk to age 90 | Estimated absolute invasive breast cancer risk from current age through age 90 |
| Average 5-year risk | Same-age and race/ethnicity population comparison |
| Average risk to age 90 | Same-age and race/ethnicity population comparison through age 90 |
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
- For an eligible US woman aged 35-85 when an NCI BCRAT absolute-risk estimate is clinically useful.
- After confirming that prior breast cancer/in situ disease, Hodgkin chest radiation, and known hereditary syndromes are absent.
How To Interpret
- Read the patient estimate beside the same-age/race average; BCRAT itself does not define low, moderate, or high categories.
- Treat five-year and to-age-90 values as model estimates, not predictions of an individual outcome.
What To Do Next
- Use the estimate within shared clinical decision-making and current screening or prevention guidance.
- Assess hereditary risk, breast density, medication harms, and factors not represented by BCRAT separately.
Limitations
- Not applicable after invasive breast cancer, DCIS, LCIS, prior Hodgkin chest radiation, or a known associated hereditary syndrome.
- May underestimate risk in Black women with prior biopsies and Hispanic women born outside the United States.
- The NCI Other model for American Indian/Alaska Native or unknown race has limited validation.
- The calculator does not itself recommend medication, screening modality, or treatment.
Validated Population
US women aged 35-85 identifying as White, Black/African American, Hispanic, or Asian/Pacific Islander.
Calculation verification history
Verified
Calculation verification history
Verified: Production browser revalidation
- Three source-backed cases passed through the visible production controls at ages 35 and 85 and through the prior-history ineligibility short-circuit.
- Both four-part BCRAT outputs matched the NCI v4.1 expected values, and the ineligible branch no longer required unrelated fields or displayed a missing-input trace.
- No unexpected N/A, stale control, literal undefined/null value, or browser-console error was observed.
Case-level evidence is retained in validation/browser-revalidation/gail-model-breast-2026-08-03.json.
: Eligibility short-circuit and receipt corrected and browser-revalidated locally
- Prior breast cancer, DCIS/LCIS, or Hodgkin chest radiation now short-circuits before unrelated risk-factor questions, and a known hereditary syndrome short-circuits after its eligibility answer.
- Intentional Not applicable outcomes now show a BCRAT-specific risk-estimate-not-assigned receipt instead of the generic missing-or-invalid-input explanation.
- Ten visible-browser cases passed across 11 submissions, covering age boundaries, all race-model families, conditional race and biopsy branches, ineligibility, and reset/repeat; the independent source audit remains 581/581.
Case-level local remediation evidence is retained in validation/browser-production/gail-model-breast.local-remediation.json; the original production finding remains retained separately.
: Production browser validation
- Ten source-backed cases were exercised on the public production route through visible browser controls; 9/10 case records passed their expected-versus-observed assertions across 12 visible submissions.
- Overall browser status: failed-ui-and-console. high: Selecting prior breast cancer, DCIS/LCIS, or Hodgkin chest radiation and clicking Calculate does not return the source-defined Not applicable disposition; the form instead requires every unrelated risk-factor field. | medium: After all unrelated fields are completed, the correct Not applicable result also displays Required input is missing or invalid. | medium: Production emitted minified React error #418 during the route load.
- 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/gail-model-breast.json.
: Full validation test
- 581/581 official-source, independent-oracle, risk-pattern, race-recoding, age-integration, boundary, malformed-input, eligibility, UI, trace, report, registry, and isolation checks passed.
- Three later-vignette values retaining BCRA 1.0 race-code meanings were reconciled to the current v4.1 source semantics and are disclosed in the supplementary report.
- No registered master panel calculates BCRAT; no panel receives inherited verification.
: Calculation and input-contract correction
- Replaced the simplified relative-risk approximation with NCI BCRAT v4.1 five-year and risk-to-age-90 estimates, including same-age/race comparisons.
- Added race-specific calculations, age 35-85 and eligibility checks, explicit missing-data handling, strict biopsy/atypia rules, and removal of invented risk categories and automatic medication recommendations.
Verification confirms the calculator implementation against the cited model; it is not independent clinical validation, regulatory approval, or medical advice.
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Frequently Asked Questions
When should NCI BCRAT (Gail Model) be used?
Use it for patients undergoing breast cancer risk, staging, pathology, recurrence, or treatment-benefit assessment when all required inputs and the intended clinical setting are confirmed.
Can NCI BCRAT (Gail Model) 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.