Background: The prognostic role of lymph nodes metastasis in pancreatic neuroendocrine tumours is unclear.
Methods: Retrospective study of 53 patients who underwent a curative standard resection for pancreatic neuroendocrine tumours. The endpoint was to define the role of the lymph nodes ratio in recurrence after curative surgery. The following data were considered as possible factors for predicting the risk of recurrence: gender, age, presence of symptoms, hormonal status, site of tumours, type of resection, size of the tumours, radical resection, pathological T, N and M stage, the Ki67 index, the number of lymph nodes harvested, the number of metastatic lymph nodes and the lymph node ratio. Recurrence rate and time of recurrence were evaluated.
Results: Twelve (26.4%) patients developed a recurrence with a median time of 42.8 (1-305) months. At multivariate analysis, the only factors related to recurrence were: size of lesions (HR 1.1, C.I. 95% 1.0-1.1, P = 0.011), Ki67 ≥ 5% (HR 3.6, C.I. 95% 1.3-10, P = 0.014) and LNR > 0.07 (HR 5.2, C.I. 95% 1.1-25, P = 0.045).
Conclusions: Our study confirmed that the lymph nodes ratio played an important role in the recurrence rate and suggested that a low number of metastatic lymph nodes reduced the disease free survival.
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