局部晚期NSCLC模板辅助技术192Ir源后装立体消融治疗安全性初步观察

Preliminary observation of the safety of template-assisted 192Ir source hypofractionated stereotactic ablative brachytherapy for locally advanced non-small cell lung cancer

目的初步评价共面模板技术引导192Ir源后装立体消融(SABT)技术在局部晚期NSCLC治疗中的安全性,并通过比较SABT模拟计划与实际计划剂量学参数的一致性评估模板引导技术对SABT精确性影响。方法选取病理学确诊为局部晚期NSCLC的初治患者15例,行模板引导SABT治疗(处方剂量30 Gy)。所有患者均经术前模拟计划制作,再由模板辅助技术引导插植针植入,进行实际计划的制作和执行。比较模拟计划和实际计划的肿瘤靶区剂量学数据(包括HI、CI、D90、V100、V150)和危及器官受量(包括双肺的V5、V20、Dmean和脊髓D2cc);并详细记录SABT围手术期相关并发症,评估安全性和可行性。结果实际计划中的靶区剂量和肺受量等数据较术前模拟略有变化,但差异均无统计学意义(P>0.05);所有患者未见重度气胸、血胸和严重咯血等严重并发症。结论应用模板引导技术可以保证SABT插植针植入更加准确,使实际计划与术前模拟计划的剂量学参数保持良好一致性,使得模板引导下的SABT安全可行,保证其治疗效果。

Objective To preliminarily evaluate the safety of the coplanar template-assisted 192Ir hypofractionated stereotactic ablative brachytherapy (SABT) in patients with locally advanced non-small cell lung cancer (LA-NSCLC), and assess the effect of template-assisted technology upon the accuracy of SABT by comparing the consistency of dosimetric parameters between preoperative and operative plans. Methods Fifteen patients histologically confirmed with LA-NSCLC (stage ⅡB-ⅢA) were recruited and received the template-assisted SABT delivered in a risk-adapted fractionation (30 Gy/1F). Preoperative planning, template-assisted needle implantation, operative planning and implementation were performed in all patients. Dosimetric results of preoperative and operative plans were statistically compared by assessing the dosimetric parameters of gross tumor volume (HI, CI, D90, V100 and V150) and organ at risk(V5, V20 and mean dose of bilateral lung, D2cc of spinal cord. The incidence of perioperative complications of SABT was recorded. The safety and feasibility of SABT were evaluated. Results Slight changes were noted in terms of target dose and irradiated dose to the lung between preoperative and operative plans without statistical significance (both P>0.05). No severe adverse events, such as severe pneumothorax, hemothorax and hemoptysis were observed. Conclusions Application of the template-assisted SABT can enhance the accuracy of implantation, maintain the consistency of the dosimetric parameters between the preoperative and operative plans and guarantee the clinical efficacy.