Prognostic Value of the Systemic Immune-Inflammation Index (SII) After Neoadjuvant Therapy for Patients with Resected Pancreatic Cancer

Pranav Murthy, Mazen S. Zenati, Amr I. Al Abbas, Caroline J. Rieser, Nathan Bahary, Michael T. Lotze, Herbert J. Zeh, Amer H. Zureikat, Brian A. Boone

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


Background: The systemic immune-inflammation index (SII), calculated using absolute platelet, neutrophil, and lymphocyte counts, has recently emerged as a predictor of survival for patients with pancreatic ductal adenocarcinoma (PDAC) when assessed at diagnosis. Neoadjuvant therapy (NAT) is increasingly used in the treatment of PDAC. However, biomarkers of response are lacking. This study aimed to determine the prognostic significance of SII before and after NAT and its association with the pancreatic tumor biomarker carbohydrate-antigen 19-9 (CA 19-9). Methods: This study retrospectively analyzed all PDAC patients treated with NAT before pancreatic resection at a single institution between 2007 and 2017. Pre- and post-NAT lab values were collected to calculate SII. Absolute pre-NAT, post-NAT, and change in SII after NAT were evaluated for their association with clinical outcomes. Results: The study analyzed 419 patients and found no significant correlation between pre-NAT SII and clinical outcomes. Elevated post-NAT SII was an independent, negative predictor of overall survival (OS) when assessed as a continuous variable (hazard ratio [HR], 1.0001; 95% confidence interval [CI] 1.00003–1.00014; p = 0.006). Patients with a post-NAT SII greater than 900 had a shorter median OS (31.9 vs 26.1 months; p = 0.050), and a post-NAT SII greater than 900 also was an independent negative predictor of OS (HR, 1.369; 95% CI 1.019–1.838; p = 0.037). An 80% reduction in SII independently predicted a CA 19-9 response after NAT (HR, 4.22; 95% CI 1.209–14.750; p = 0.024). Conclusion: Post-treatment SII may be a useful prognostic marker in PDAC patients receiving NAT.

Original languageEnglish (US)
Pages (from-to)898-906
Number of pages9
JournalAnnals of Surgical Oncology
Issue number3
StatePublished - Mar 1 2020

ASJC Scopus subject areas

  • Surgery
  • Oncology


Dive into the research topics of 'Prognostic Value of the Systemic Immune-Inflammation Index (SII) After Neoadjuvant Therapy for Patients with Resected Pancreatic Cancer'. Together they form a unique fingerprint.

Cite this