Prognostic significance of Nottingham histologic grade in invasive breast carcinoma.
OBJECTIVE
The three strongest prognostic determinants in operable breast cancer used in routine clinical practice are lymph node (LN) stage, primary tumor size, and histologic grade. However, grade is not included in the recent revision of the TNM staging system of breast cancer as its value is questioned in certain settings.


METHODS
This study is based on a large and well-characterized consecutive series of operable breast cancer (2,219 cases), treated according to standard protocols in a single institution, with a long-term follow-up (median, 111 months) to assess the prognostic value of routine assessment of histologic grade using Nottingham histologic grading system.


RESULTS
Histologic grade is strongly associated with both breast cancer-specific survival (BCSS) and disease-free survival (DFS) in the whole series as well as in different subgroups based on tumor size (pT1a, pT1b, pT1c, and pT2) and LN stages (pN0 and pN1 and pN2). Differences in survival were also noted between different individual grades (1, 2, and 3). Multivariate analyses showed that histologic grade is an independent predictor of both BCSS and DFS in operable breast cancer as a whole as well as in all studied subgroups.


CONCLUSIONS
Histologic grade, as assessed by the Nottingham grading system, provides a strong predictor of outcome in patients with invasive breast cancer and should be incorporated in breast cancer staging systems.
Rakha
Emad A
EA
Department of Histopathology, School of Molecular Medical Sciences, Division of Epidemiology and Public Health, University of Nottingham, Nottingham City Hospital NHS Trust, Hucknall Rd, Nottingham, NG5 1PB United Kingdom. emadrakha@yahoo.com
El-Sayed
Maysa E
ME
Lee
Andrew H S
AH
Elston
Christopher W
CW
Grainge
Matthew J
MJ
Hodi
Zsolt
Z
Blamey
Roger W
RW
Ellis
Ian O
IO
D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000473:pathology* / Q000628:therapy; D016009:Chi-Square Distribution; D005260:Female; D006801:Humans; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D009367:Neoplasm Staging; D011379:Prognosis; D016016:Proportional Hazards Models; D015996:Survival Rate