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Clinical calculator summary

Age-Modified 2003 USC Van Nuys Prognostic Index

A historical four-domain score using DCIS size, closest margin, pathologic class, and age to stratify ipsilateral local-recurrence risk.

Evidence-based context for fast calculator use

Purpose:
Support contextual multidisciplinary discussion after definitive excision for pure DCIS
Population:
Pure DCIS after definitive excision with complete size, margin, grade, necrosis, and age information
Factors:
DCIS size, Closest margin width, Nuclear grade and comedonecrosis, Age
Reference:
Silverstein, Am J Surg 2003; DOI 10.1016/S0002-9610(03)00265-4
HomeVan Nuys Prognostic Index (USC-VNPI)
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Van Nuys Prognostic Index (USC-VNPI)

Clinical Context & Background

This calculator implements the age-modified 2003 University of Southern California/Van Nuys Prognostic Index for pure ductal carcinoma in situ after definitive excision. It sums four 1-to-3 point domains: DCIS size, closest margin, pathologic class, and age. Its treatment bands were derived from nonrandomized historical cohorts and are not contemporary autonomous treatment recommendations. This is not the separate 1996 three-domain index or the margin-dependent 2010/2015 refinement.
Primary Source EvidenceSilverstein MJ. Am J Surg. 2003;186(4):337-343. DOI: 10.1016/S0002-9610(03)00265-4.
Formula Logic
Size points + margin points + pathologic-class points + age points. Each domain contributes exactly 1, 2, or 3 points; total range 4-12.

Reference Data

Total ScoreHistorical Recurrence BandHistorical Author-Derived Approach
4-6LowerExcision alone was considered.
7-9IntermediateExcision plus radiation or feasible re-excision was considered.
10-12HigherMastectomy or feasible re-excision was considered.

Clinical Workflow

Use, Interpret, And Continue The Patient Pathway

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

When To Use

  • Use only after definitive excision of histologically confirmed pure DCIS when all four domains are known.
  • Use as historical recurrence-stratification context within contemporary multidisciplinary and shared decision-making.
  • Confirm the pathology report provides complete lesion size, closest margin, grade, and comedonecrosis information.

How To Interpret

  • Scores 4-6, 7-9, and 10-12 were grouped into lower, intermediate, and higher historical recurrence bands.
  • The displayed approaches reproduce the coarse 2003 author-derived bands, not the different margin-dependent 2010/2015 refinement.
  • The model concerns ipsilateral local recurrence and does not estimate distant recurrence, overall survival, or systemic-treatment benefit.

What To Do Next

  • Review current DCIS guidance, margin status, imaging-pathology concordance, endocrine-receptor status, comorbidity, and patient preference.
  • Discuss radiation and surgical options with breast surgery and radiation oncology rather than treating the score band as a directive.
  • Use an appropriate staging or prognostic tool if microinvasion or invasive carcinoma is present.

Limitations

  • Do not use for microinvasive or invasive breast cancer, biopsy-only assessment, recurrent disease without specialist review, or incomplete pathology.
  • Treatment assignment in the development cohorts was nonrandomized, and independent studies have not established VNPI as a standalone treatment selector.
  • The historical 10 mm margin category is a model component, not a statement that contemporary DCIS surgery requires a 10 mm margin.

Validated Population

Patients with pure DCIS after definitive excision and complete pathological size, closest margin, nuclear grade, comedonecrosis, and age data.

Example use

A patient older than 60 with DCIS ≤15 mm, a margin ≥10 mm, and grade 1/2 disease without necrosis scores 4, the lower historical band.

Breast cancer calculator hubMove between DCIS, invasive staging, recurrence, and prognosis tools.MSKCC DCIS official-tool guideReview the separate official DCIS nomogram workflow without linking to an unlisted recorder.Residual Cancer BurdenUse after neoadjuvant therapy for invasive breast cancer residual disease.CTS5 late recurrenceUse for a separate late distant-recurrence question after endocrine therapy for invasive breast cancer.

Calculation verification history

Verified

  1. : Production browser revalidation

    • Three source-backed cases passed through visible production controls at VNPI scores 4, 7, and 12.
    • Lower, Intermediate, and Higher historical bands rendered as expected.
    • No unexpected N/A, literal undefined value, stale control, unsupported gauge, or browser-console error was observed.
    Download latest production check (Excel)

    Case-level evidence is retained in validation/browser-revalidation/vnpi-breast-2026-08-03.json.

  2. : Production browser validation

    • Ten source-backed cases were exercised on the public production route through visible browser controls; 10/10 case records passed their expected-versus-observed assertions across 11 visible submissions.
    • Overall browser status: failed-console. 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/vnpi-breast.json.

  3. : Full validation test

    • Passed all 81 possible point combinations and 13 malformed-input cases with zero difference.
    • Verified only the age-modified 2003 coarse score and historical author-derived bands, not the 2010/2015 margin-dependent algorithm.

  4. : Correction

    • Removed favorable preselected defaults and now require deliberate selection of all four domains.
    • Reject missing, extra, fractional, nonfinite, string, and out-of-range point values.
    • Relabeled treatment bands as historical nonrandomized author-derived guidance rather than current treatment directives.

    Included in the current validation report.

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

Which VNPI version is implemented?

The age-modified 2003 four-domain USC-VNPI. It is not the original 1996 three-domain score or the 2010/2015 margin-dependent refinement.

Does a VNPI band determine treatment?

No. The bands summarize a historical, nonrandomized author-derived approach and must not replace current guidelines or multidisciplinary shared decision-making.

Which four factors are included in the VNPI?

The age-modified 2003 score uses DCIS size, closest excision margin, pathologic class based on nuclear grade and comedonecrosis, and patient age.

Who is the VNPI intended for?

It is intended for patients with histologically confirmed pure DCIS after definitive excision when all four domains are available. It is not intended for invasive or microinvasive breast cancer.

What do the VNPI score bands represent?

Scores 4-6, 7-9, and 10-12 reproduce lower, intermediate, and higher historical local-recurrence bands from nonrandomized cohorts. They do not estimate distant recurrence or overall survival.

Does the 10 mm VNPI margin category define a modern adequate margin?

No. Ten millimetres is a historical model category and should not be interpreted as a contemporary surgical margin requirement.

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