Analysis of clinical efficacy of P-Gemox regimen sandwich radiotherapy, P-Gemox regimen sequential radiotherapy, and radiotherapy alone treatment for extranodal natural killer/T-cell lymphoma

Objective The study aimed to explore the clinical efficacy of P-Gemox regimen sandwich radiotherapy, P-Gemox regimen sequential radiotherapy, and radiotherapy alone in early-stage extranodal natural killer/ T-cell lymphoma (ENKTL). Methods In total, 124 patients with early-stage ENKTL, from June 2009 to January 2016, were retrospectively analyzed to compare the clinical efficacy of the three regimens. Results A total of 46 patients were treated with P-Gemox regimen sandwich radiotherapy, with complete remission (CR) of 91.3％, objective response rate (ORR) of 97.8％, 2-year progression-free survival (PFS) of 76.1％, and 2-year overall survival (OS) of 80.4％. Then, 37 patients received P-Gemox regimen sequential radiotherapy, with CR of 86.5％, ORR of 94.6％, 2-year PFS of 75.7％, and 2-year OS of 81.1％. Finally, 41 patients received radiotherapy alone, with CR of 61.0％, ORR of 80.5％, 2-year PFS of 51.2％, and 2-year OS of 65.9％. When the two groups were compared, significant differences in CR, PFS, and OS were observed among the sandwich radiotherapy, sequential radiotherapy, and radiotherapy alone groups (P < 0.05), respectively. However, no significant difference in CR, ORR, PFS, and OS was observed between the sandwich radiotherapy and sequential radiotherapy groups (P > 0.05). Multivariate analysis revealed that Eastern Cooperative Oncology Group (ECOG), serum lactate dehydrogenase (LDH), plateletto- lymphocyte ratio (PLR), local tumor invasion, and treatment modalities were independent prognostic factors for PFS (P < 0.05). ECOG, LDH, PLR, local tumor invasion, underlying disease, and treatment modalities were independent prognostic factors for OS (P < 0.05). Conclusion P-Gemox regimen combination radiotherapy for patients with early-stage ENKTL was better than the radiotherapy alone.