Comparison of GP and TPF induction chemotherapy for locally advanced nasopharyngeal carcinoma

This study aims to compare two induction chemotherapy regimens, TPF and GP, for patients with locally advanced nasopharyngeal carcinoma (NPC).We analyzed patients with newly diagnosed stage III-IVA NPC (excluding T3/T4N0, AJCC) between December 2010 and May 2015 who were treated with TPF or GP induction chemotherapy (IC) followed with concurrent chemoradiotherapy (CCRT) and those treated with CCRT alone. Treatment compliance, survival outcomes and grade 3-4 side effects were compared among these three groups.A total of 189 patients were eligible for this study, with 87 (46.0%), 71 (37.6%) and 31 (16.4%) in the TPF, GP and CCRT alone groups. All patients were followed for 3 years. There was no difference in the 3-year survival rate between GP- and TPF-treated patients. Disease-free survival (DFS) and overall survival (OS) were significantly improved in both IC groups compared with those in the CCRT alone group. Multivariable analysis suggested that patients with N3 had a higher risk of distant metastasis than those with N1-2. GP is not inferior to TPF regardless of different N categories. There were significant more grade 3-4 treatment-related toxicity in TPF group than in GP group.Our study found that in locally advanced NPC, the GP induction chemotherapy regimen is equivalent to TPF in treatment outcomes, but with significant less grade 3-4 acute toxicity. Further studies are needed to validate our findings.