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BACKGROUND Extranodal NK/T-cell lymphoma (ENKTL) of the nasal type is highly invasive and relatively resistant to chemotherapy. This study aimed to assess the efficacy and safety of an extended chemotherapy regimen with increased dose intensity. MATERIAL AND METHODS This was a retrospective cohort study of 69 patients &lt;60 years old with an ECOG score 0-2 treated for ENKTL at the Second Affiliated Hospital of Xi'an Jiaotong University between January 2004 and December 2013. The outcomes were compared between patients who received &gt;8 courses of high-intensity chemotherapy (n=37) vs. 6-8 courses (n=18) and &lt;6 courses (n=14) of conventional chemotherapy. Regimens included improved CHOP, CHOP-E, EPOCH, MAED, MMED, SMILE, and Hyper-CVAD with an increased dose intensity in the &gt;8 courses group. RESULTS The mean follow-up was 52 months (8 to 82 months). Remission rate did not differ significantly when compared among the 3 groups after 3 courses of chemotherapy (83.8%, 77.8%, and 78.6%, respectively, overall P=0.834), but the 5-year overall survival (OS) differed significantly (63.5%, 45.1%, and 22.9%, respectively, overall P=0.030), as did progression-free survival (PFS) (59.1%, 36.0%, and 15.1%, respectively, overall P=0.020), disease-free survival (DFS) (54.1%, 35.5%, and 12.9%, respectively, overall P=0.022), and total relapse rate throughout follow-up (37.04%, 50.0%, and 88.89%, respectively, overall P=0.027). There were no differences in adverse effects among the 3 groups. CONCLUSIONS These results suggest improved OS, PFS, DFS, and relapse rate in young patients with ENKTL receiving &gt;8 courses of high-intensity chemotherapy.

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Extended Course and Increased Dose of Initial Chemotherapy for Extranodal Nasal Type Natural Killer/T (NK/T)-Cell Lymphoma in Patients &lt;60 Years Old: A Single-Center Retrospective Cohort Study