Efficacy of third-line chemotherapy following nanoliposomal irinotecan combined with fluorouracil and folinic acid as second-line treatment for unresectable pancreatic cancer

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Introduction: The significance of third-line chemotherapy (CTx) in unresectable pancreatic cancer (UPC) remains unclear. This study evaluated the therapeutic impact of third-line CTx after nanoliposomal irinotecan and fluorouracil combined with folinic acid (nal-IRI + 5-FU/LV) therapy as second-line CTx for UPC. Methods: Between June 2020 and May 2021, 104 patients who received nal-IRI + 5-FU/LV therapy as second-line CTx were retrospectively analyzed for post-discontinuation survival (PDS) and overall survival (OS). Comparisons were made between patients transitioning to third-line CTx and those receiving best supportive care (BSC), using a Cox proportional hazards model adjusted for patient background. Results: Of the cohort, 34 patients received third-line CTx, whereas 61 transitioned to BSC. The median OS from first-line CTx in the third-line CTx group was 18.0 months, with a median OS of 9.7 months from second-line CTx. Adjusted median PDS following second-line CTx was 6.5 months for the third-line CTx group compared to 2.3 months for the BSC group (adjusted hazard ratio 0.16; 95% confidence interval 0.08-0.32; P < 0.01). Conclusion: Third-line CTx should be actively considered for patients with UPC, as the approach may significantly extend survival in those who can tolerate the treatment.

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