Purpose: Several studies have reported a negative impact on survival associated with splenic vessel involvement, especially splenic artery (SpA) involvement, in patients diagnosed with pancreatic body or tail cancer. However, there is limited research on splenic vein (SpV) involvement. Therefore, we aimed to elucidate the significance of splenic vessel involvement, especially SpV involvement, in patients with resectable pancreatic body or tail cancer.
Methods: Between January 2007 and December 2021, 116 consecutive patients underwent distal pancreatectomies for pancreatic body or tail cancer. Among them, this study specifically examined 88 patients with resectable pancreatic body or tail cancer to elucidate prognostic factors using a multivariable Cox proportional analysis. The Kaplan-Meier method evaluated the impact of SpV involvement in terms of both radiological and pathological aspects and the efficacy of neoadjuvant therapy.
Results: Higher pre-operative carcinoembryonic antigen levels, larger tumour size, pathological SpV invasion, and non-completion of adjuvant therapy were identified as independent poor prognostic factors for overall survival (OS) and recurrence-free survival (RFS). Additionally, patients with radiological SpV encasement had significantly worse prognoses in terms of OS (p = 0.039) and RFS (p < 0.001). The sensitivity and specificity of multidetector-row computed tomography for detecting pathological SpV invasion were 81.0% and 61.2%, respectively. However, the prognostic impact of neoadjuvant therapy could not be determined, regardless of radiological SpV involvement.
Conclusion: Radiological and pathological SpV involvement is a poor prognostic factor for patients with resectable pancreatic body or tail cancer. New innovative treatments and effective neoadjuvant therapy regimens are required for patients with SpV involvement.
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