[Efficacy and safety of PEMD regimen in newly diagnosed early-stage non-upper respiratory digestive tract or advanced extranodal natural killer/T-cell lymphoma].

To evaluate the efficacy and safety of the pegaspargase, etoposide, methotrexate, and dexamethasone (PEMD) regimen in patients with early-stage nonupper respiratory digestive tract or advanced extranodal natural killer/T-cell lymphoma (ENKTL) . This retrospective analysis included 38 patients with newly diagnosed early-stage non-upper respiratory digestive tract or advanced ENKTL who received PEMD regimen for induction chemotherapy at the First Affiliated Hospital of Nanjing Medical University from January 2016 to December 2022. Survival outcomes and prognostic factors were examined by Kaplan-Meier, and the Log-rank test was used to compare survival. The study population had a median age of 48 years (range, 26-72 years) and included 30 males (78.9%) and 8 females (21.1%). 7 patients' age >60 years (18.4%). The Eastern Cooperative Oncology Group (ECOG) performance score was >1 in 7 patients (18.4%) ; 20 patients (52.6%) had elevated lactate dehydrogenase levels; and 37 patients (97.4%) exhibited extranodal involvement. Using the Ann Arbor staging system, 37 patients (97.4%) were classified as stage Ⅲ-Ⅳ. The median number of treatment cycles was 5 (1-6), and the median follow-up duration was 60 months (24 - 101 months). Interim efficacy assessment revealed an overall response rate of 52.7%. At 2 and 4 years, the progression-free survival (PFS) rates were 34.2% (95% 22.0%-53.2%) and 25.5% (95% 14.7%-44.4%), respectively, and the overall survival rates were 50.0% (95% 36.4%-68.7%) and 45.5% (95% 31.4%-65.7%), respectively. The risk factors for worse PFS were ECOG performance score >1 [=3.711 (95% 1.494-9.218), =0.005]; bone marrow infiltration [=2.251 (95% 1.026 - 4.938), =0.043]; and Prognostic Index for Natural Killer/T-Cell Lymphoma score of 3 - 5 [=2.350 (95% 1.009 - 5.476), =0.048]. Multivariate analysis identified ECOG performance score >1 as an independent risk factor for PFS [=7.971 (95% 2.222 - 28.591), =0.001]. The main adverse effect was anemia in 31 patients (81.6%) . The PEMD regimen was safe and effective for patients with newly diagnosed early-stage non-upper respiratory digestive tract or advanced ENKTL.