Frequency of surveillance computedtomography in non-hodgkin lymphoma and the risk of secondary primarymalignancies: A nationwide population-based study. 非霍奇金淋巴瘤CT复查的频率和二次肿瘤的风险:一项全国范围内基于人群的研究 Abstract 摘要 With increasing usage of computedtomography (CT) for lymphoma patients receiving curative-intent treatment,development of secondary primary malignancy (SPM) related to radiation from CTscans becomes an emerging issue in these long-term survivors. CT被越来越多的应用于接受以治愈为目的治疗的淋巴瘤患者,与CT辐射相关的二次肿瘤的发生在这些长期的幸存者中正在成为一个问题。 We conducted a nationwide population-basedstudy analyzing non-Hodgkin lymphoma (NHL) patients receiving curative-intenttreatment between January 1997 and December 2010. Patients were divided intotwo populations by the medium number of CT performed. The cumulative incidenceof SPM in these two groups was compared using the Kaplan-Meier method.Propensity score matching was applied to eliminate potential confounders. Groupstratification and multivariate analyses calculated by Cox proportional hazardmodels using competing risk analyses adjusted for mortality were performed toidentify independent predictors for SPM. 我们进行了一项全国范围内人群为基础的研究,对从1997年1月到2010年12月期间接受以治愈为目的的治疗的非霍奇金患者的情况进行了分析。将患者根据接受的CT检查的数量分成了两组。对这两组中二次肿瘤的累计发病率用乘积极限法进行比较。用倾向得分匹配来消除潜在的混杂因素。通过COX比例风险模型使用竞争生存分析进行了分层和多变量计算来确定二次肿瘤的预测因素。 Patients receiving >8 CT scans had asignificantly greater risk for developing SPM (hazard ratio [HR] 2.25, 95%confidence interval [CI] 1.61-3.13; p< 0.001) than those with ≤8 scans andthis difference remained significant even after correction with propensityscore matching. Among the 180 SPM identified, those receiving more CT scans hadsignificantly higher SPM incidence in cancers of the breast (HR 11.22), stomach(HR 5.22), and liver and biliary tract (HR 2.18) in comparison to those withless exposure. The risk of SPM was estimated to increase 3% per one more CTscan performed. Our study demonstrated that after curative-intent treatment,NHL patients receiving more frequent surveillance CT scans would have anincreased risk of SPM. 接受过大于8次CT检查的患者的二次肿瘤风险(风险比率2.25,95%CI 1.61-3.13;p<0.001)明显高于接受少于8次CT检查的患者,即使用倾向得分匹配法进行修正后差别依然很大。在确认的180例二次肿瘤中,接受较多CT检查的患者比较少的患者有明显较高的发生于乳腺(风险比率11.22),胃(风险比率5.22),肝脏和胆道(风险比率2.18)的二次肿瘤风险。据估算,每多做一次CT二次肿瘤的风险增加3%。我们的研究证实,非霍奇金淋巴瘤患者在接受以治愈为目的的治疗后过于频繁的CT复查会增加二次肿瘤的风险。
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