Impact of Lymph Node Status on Outcomes in Resectable Pancreatic SPTs

Overview

This SEER population analysis of 293 patients with resectable, non-metastatic pancreatic Solid Pseudopapillary Tumors (SPTs) demonstrates that lymph node involvement, age, tumor location, and radiotherapy significantly influence overall survival. The study reports a high 5-year overall survival rate of 96.2%, with positive lymph nodes and advanced age associated with worse prognosis.

Background

Solid Pseudopapillary Tumors of the pancreas are rare neoplasms with generally indolent behavior and favorable prognosis after surgical resection. Due to their rarity, prognostic factors remain poorly characterized, and prior studies have been limited to small series or single-center experiences. This study leverages a large population-based SEER database to identify demographic, pathological, and treatment-related factors impacting survival in patients with resectable, non-metastatic pancreatic SPTs. Understanding these factors is critical for risk stratification and optimizing treatment strategies.

Data Highlights

Key Findings

• Positive lymph node status significantly worsened overall survival (HR 2.57, p = 0.001).
• Higher lymph node ratio was strongly associated with poorer prognosis (p < 0.001).
• Older age at diagnosis independently predicted worse survival (multivariate HR 8.29, p = 0.004).
• Tumors located in the pancreatic head or body had different prognostic implications compared to tail location.
• Receipt of radiotherapy was associated with worse prognosis in univariate analysis (HR 17.8, p = 0.007), though most patients did not receive it.
• Majority of patients did not receive chemotherapy or radiotherapy, reflecting the indolent nature of SPTs.

Clinical Implications

Lymph node status should be carefully assessed during surgical resection of pancreatic SPTs as it is a key prognostic factor influencing survival. Older patients and those with tumors in the pancreatic head or body may require closer surveillance and tailored management. Given the excellent overall survival, routine use of adjuvant chemotherapy or radiotherapy appears limited but may be considered in select high-risk cases with nodal involvement.

Conclusion

This large population-based study confirms that lymph node involvement and patient age are critical independent predictors of survival in resectable, non-metastatic pancreatic SPTs. These findings support the importance of adequate lymphadenectomy and individualized postoperative management to optimize outcomes.

References

1. SEER Program, National Cancer Institute -- SEER Database
2. AJCC 8th Edition Staging Manual -- Pancreatic Cancer