Surgery and staging of pancreatic neuroendocrine tumors: a 14-year experience.
BACKGROUND
The aims of this study were to evaluate contemporary outcomes associated with the surgical management of pancreatic neuroendocrine tumors (PNETs) and to assess the prognostic value of the World Health Organization (WHO) classification and TNM staging for PNETs.


METHODS
The medical records of 73 consecutive patients with PNETs treated at a single institution from January 1992 through September 2006 were reviewed. Survival was analyzed with the Kaplan-Meier method (median follow-up: 43 months).


RESULTS
Median patient age was 52 years (range, 19-83 years), and 36 (49%) patients were male. Thirty-three patients had a well-differentiated neuroendocrine tumor (WDT), 26 had a well-differentiated neuroendocrine carcinoma (WDCa), and 14 had a poorly differentiated neuroendocrine carcinoma (PDCa). Fifty (68%) patients underwent potentially curative resection, and the 5-year disease-specific survival (DSS) rate for the entire cohort was 62%. WHO classification and TNM staging system provided good prognostic stratification of patients; 5-year DSS rates were 100% for WDT, 57% for WDCa, 8% for PDCa, respectively, by WHO classification (p < 0.001), and 100% for stage 1, 90% for stage 2, 57% for stage 3, and 8% for stage 4, respectively, by TNM stage (p < 0.001). Among the patients who underwent potentially curative resection, nodal status, distant metastasis, and tumor grade were significant prognostic factors.


CONCLUSIONS
WHO classification and TNM staging are useful for prognostic stratification among patients with PNETs.
Ito
Hiromichi
H
Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, 75 Francis Street, Boston, MA, USA.
Abramson
Michael
M
Ito
Kaori
K
Swanson
Edward
E
Cho
Nancy
N
Ruan
Daniel T
DT
Swanson
Richard S
RS
Whang
Edward E
EE
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D016009:Chi-Square Distribution; D018572:Disease-Free Survival; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000401:mortality / Q000473:pathology* / Q000601:surgery; D009367:Neoplasm Staging / Q000145:classification*; D018358:Neuroendocrine Tumors / Q000401:mortality / Q000473:pathology* / Q000601:surgery*; D010180:Pancreatectomy / Q000379:methods / Q000401:mortality; D010190:Pancreatic Neoplasms / Q000401:mortality / Q000473:pathology* / Q000601:surgery*; D011183:Postoperative Complications / Q000401:mortality / Q000473:pathology; D011336:Probability; D012042:Registries; D012189:Retrospective Studies; D016019:Survival Analysis; D014944:World Health Organization; D055815:Young Adult