Background: Induction chemotherapy (IC) was associated with a decreased risk of distant metastasis in locally advanced nasopharyngeal carcinoma (LA-NPC). However, compared with TPF, whether the TP regimen can reduce the related toxicities caused by 5-FU while ensuring the survival benefit remains unclear.Methods: 213 patients diagnosed with LA-NPC (stage III-IVA) were included retrospectively. The prognosis of TPF and TP was compared by Kaplan-Meier and Cox proportional hazard regression. The treatment-related toxicities were evaluated according to CTCAE v4.0 and RTOG criteria. Results: TPF was found to have a higher 5-year DMFS in stage IVA and N2-3 patients, which not applicable to stage III and N0-1. The optimal value of pre-treatment SII was 432.48. A further subgroup analysis revealed that patients in stage IVA combined with pretreatment SII≥432.48 could get higher OS (P=0.038) and DMFS (P=0.028) from TPF. Multivariate analysis showed that SII was a prognostic factor for PFS (HR 2.801, P=0.018) and DMFS (HR 3.735, P=0.032), and IC regimen (HR 2.182, P=0.049) for predicting DMFS. The rate of grade 3-4 leukopenia (P=0.038), neutropenia (P=0.021), radiation oral mucositis (P=0.048) and diarrhea (P=0.036) were more common in TPF group. Conclusion: Our study revealed that TPF regimen showed a higher 5-year DMFS for stage IVA and N2-3 patients, while TP may be enough for stage III and N0-1. In LA-NPC patients with high risk (stage IVA combined with pre-treatment SII ≥ 432.48), TPF had a higher 5-year OS and DMFS, although grade 3-4 toxicities were more common but tolerable.
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