早期NK/T细胞淋巴瘤扩大受累野IMRT结果

目的 评价早期NK/T细胞淋巴瘤使用扩大受累野IMRT结果,分析临床特征和治疗因素对于预后的影响。 方法 回顾分析2007—2016年间 165例早期NK/T细胞淋巴瘤接受扩大受累野IMRT,158例(95.8%)采用放化疗,7例(4.2%)单纯放疗。140例(84.8%)原发部位放疗剂量≥50 Gy,25例(15.2%)<50 Gy。147例(89.1%)接受门冬酰胺酶为主方案化疗,仅 11例(6.7%)接受CHOP或CHOP类方案化疗。109例(66.1%)接受≥4周期化疗。Kaplan-Meier法计算LRC、OS、PFS率,Logrank法检验和单因素预后分析,Cox模型多因素预后分析。 结果 5年样本量 55例,5年OS、PFS、LRC率分别为74.2%、72.5%、84.4%。放疗≥50 Gy显著提高了LC率,5年LRC为91.8%,而<50 Gy仅为39.7%(P=0.000)。早期低危组 5年OS为94.2%,而早期高危组仅为68.1%(P=0.002)。早期高危NK/T细胞淋巴瘤联合≥4个周期化疗较<4个周期组显著改善生存率,5年OS分别为71.3%和59.5%(P=0.032);5年PFS分别为70.4%和54.4%(P=0.009)。多因素分析显示ECOG≥2(P=0.006)、原发肿瘤侵犯(P=0.002)、Ann Arbor分期Ⅱ期(P=0.014)是OS影响因素,ECOG≥2(P=0.004)、原发肿瘤侵犯(P=0.016)是LRC的影响因素,而ECOG≥2(P=0.045)、原发肿瘤侵犯(P=0.003)、Ann Arbor分期Ⅱ期(P=0.030)、原发于鼻腔外(P=0.032)是PFS的影响因素。 结论 ≥50 Gy扩大受累野的IMRT对于早期NK/T细胞淋巴瘤有良好的LRC、OS和PFS。对于预后不良组的早期NK/T细胞淋巴瘤远处失败较高,放疗联合≥4周期化疗能显著改善OS和PFS。

Efficacy of extended-field intensity-modulated radiotherapy for early-stage NK/T cell lymphoma

Objective To evaluate the efficacy of extended-field intensity-modulated radiotherapy (IMRT) in the treatment of patients with early-stage NK/T cell lymphoma (NKTCL),and to examine the clinical characteristics and the effect of treatment factors on the prognosis of these patients.Methods The clinical data of 165 patients with early-stage NKTCL who underwent extended-field IMRT with (n=158,95.8%) or without chemotherapy (n=7,4.2%) were reviewed.Of these 165 patients,140(84.8%) received a radiation dose of ≥50 Gy to the primary lesion,and 25 patients (15.2%) received a radiation dose of<50 Gy.Most patients (n=147,89.1%) were treated with L-asparaginase-based chemotherapy regimens,whereas only 11 patients (6.7%) were treated with doxorubicin-based CHOP/CHOP-like regimens.In addition,109 patients (66.1%) received ≥4 cycles of chemotherapy.Locoregional control (LRC),overall survival (OS),and progression-free survival (PFS) rates were calculated using the Kaplan-Meier method,and the log-rank test was used for survival comparison and univariate prognostic analysis.A multivariate prognostic analysis was performed using the Cox model.Results The 5-year sample size 55.The 5-year OS,PFS,and LRC rates of all patients were 74.2%,72.5%,84.4%,respectively.The patients who received a dose of ≥50 Gy had a significantly higher 5-year LRC rate than those with<50 Gy (91.8% vs.39.7%,P=0.000).The 5-year OS was significantly higher in the low-risk early-stage group than in the high-risk early-stage group (P=0.002).For the high-risk early-stage NKTCL group,patients who received ≥4 cycles of chemotherapy had significantly higher 5-year OS and PFS than those who received<4 cycles of chemotherapy (5-year OS:71.3% vs.59.5%,P=0.032;5-year PFS:70.4% vs.54.4%,P=0.009).In addition,multivariate analysis showed that ECOG≥2,primary tumor invasion (PTI),and Ann Arbor stage Ⅱ were associated with poor OS (P=0.006,0.002,0.014),and ECOG≥2 and PTI were associated with reduced LRC (P=0.004,0.016).Furthermore,ECOG≥2,PTI,Ann Arbor stage Ⅱ,and extranasal primary site were associated with lower PFS (P=0.045,0.003,0.030,0.032).Conclusions Extended-field IMRT at a dose of ≥50 Gy can lead to favorable LRC,OS,and PFS in patients with early-stage NKTCL.However,it is less effective against distant early-stage NKTCL in patients with poor prognosis.Nevertheless,≥4 cycles of chemotherapy can significantly improve the OS and PFS of patients with early-stage NKTCL.