Journal of Gastrointestinal Surgery

, Volume 16, Issue 5, pp 920–926

Number of Lymph Nodes Evaluated: Prognostic Value in Pancreatic Adenocarcinoma

Authors

    • Department of SurgeryMayo Clinic
    • Department of Statistics and ProbabilityMichigan State University
    • Department of Health Sciences ResearchMayo Clinic
  • Michael Kendrick
    • Department of SurgeryMayo Clinic
  • Kaye M. Reid-Lombardo
    • Department of SurgeryMayo Clinic
  • Florencia Que
    • Department of SurgeryMayo Clinic
  • Terry Therneau
    • Department of Health Sciences ResearchMayo Clinic
  • Rui Qin
    • Department of Health Sciences ResearchMayo Clinic
  • John Donohue
    • Department of SurgeryMayo Clinic
  • David Nagorney
    • Department of SurgeryMayo Clinic
  • Michael Farnell
    • Department of SurgeryMayo Clinic
  • Michael Sarr
    • Department of SurgeryMayo Clinic
2011 SSAT Poster Presentation

DOI: 10.1007/s11605-012-1853-2

Cite this article as:
Huebner, M., Kendrick, M., Reid-Lombardo, K.M. et al. J Gastrointest Surg (2012) 16: 920. doi:10.1007/s11605-012-1853-2

Abstract

Introduction

The impact of the number of lymph node (LN) evaluated pathologically on accurate staging is unknown. Our primary aim was to determine a minimum number of evaluated LN needed to provide accurate staging of pancreatic cancer.

Methods

Four hundred ninety-nine patients underwent a curative pancreatectomy for pancreatic adenocarcinoma cancer from 1981–2007. The probability of understaging a patient as N0 was estimated based on the number of LN evaluated. The prognostic value of LN ratio (LNR) was assessed.

Results

Survival for node-negative (pN0) patients with <11 LN examined was worse than for pN0 patients with ≥11 LNs with a hazard ratio (95 % CI) of 1.33 (1.1–1.7, p = 0.01) with 3-year survivals of 32 vs. 50%, respectively. Three-year survival for pN1 patients with <11 nodes evaluated was similar to pN1 patients with ≥11 nodes (25 vs. 30%). LNR ≥ 0.17 predicted worse survival with hazard ratio of 1.76 (1.3–2.4, p = 0.001) than LNR < 0.17; 3-year survivals were 37 vs. 19%.

Conclusion

Patients with “N0” disease with <11 LN evaluated pathologically have worse survival, suggesting that metastatic nodes were missed by evaluating too few nodes. For pN1 patients, LNR stratifies survival of patient cohorts more accurately. Adequate staging of pancreatic cancer requires pathologic evaluation of ≥11 LNs.

Keywords

Pancreatic cancerLymph node ratioCancer specific survivalPathologic stagingLymph node metastasis

Copyright information

© The Society for Surgery of the Alimentary Tract 2012