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Nottingham Prognostic Index (NPI)
cm
Clinical Context & Background
The Nottingham Prognostic Index (NPI) is used to determine the prognosis of patients with operable primary breast cancer. It combines tumor size, lymph node stage, and tumor grade to stratify patients into prognostic groups.
Formula Logic
NPI = (0.2 × Size [cm]) + Lymph Node Stage (1-3) + Grade (1-3)Reference Data
| Prognostic Group | Score | 5-Year Survival |
|---|---|---|
| Excellent Prognosis | ≤ 3.4 | 94% |
| Moderate Prognosis | 3.41 - 5.4 | 74% |
| Poor Prognosis | > 5.4 | 34% |
Evidence-based oncology decision support. Verify with clinical guidelines.