AJCC 8th Edition Breast Cancer Staging Guide

Use an authoritative, current AJCC staging source to assign breast cancer stage. OncoToolkit does not reproduce the licensed AJCC stage-group tables and no longer offers an external-stage recorder.

Keep classification contexts separate

Clinical prognostic staging applies before treatment and uses clinical/imaging assessment plus biopsy grade and available ER, PR, and HER2. Pathological prognostic staging applies after complete surgical excision as first treatment and requires the complete pathology context. Post-neoadjuvant classifications use separate post-therapy notation and should not be converted into a baseline prognostic stage.

Anatomic, clinical prognostic, pathological prognostic, and post-therapy classifications are not interchangeable. Bilateral or multiple primary tumors also require separate classification.

Safety boundary

Stage is only one part of oncology decision-making. It does not by itself provide an individualized prognosis or determine systemic therapy, radiation, genomic testing, or surgery.

Public sources and licensed-table boundary

• NCI Breast Cancer Stages
• NCI Breast Cancer Treatment PDQ
• AJCC-authored eighth-edition breast staging summary, PMID 30231399
• AJCC updates and corrections
• CAP invasive breast protocol

The full AJCC tables and rules are licensed materials. This page is a clinical reference, not an AJCC implementation.